CN112392441B - Communication unit division method and exploitation method for biological reef gas reservoir - Google Patents
Communication unit division method and exploitation method for biological reef gas reservoir Download PDFInfo
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Abstract
The invention discloses a communicating unit dividing method and a mining method for a biological reef gas reservoir, wherein the dividing method comprises the steps of dividing the gas layer system of the biological reef gas reservoir, respectively carrying out reef connectivity analysis on all reef units in each gas-containing layer system, dividing adjacent reef units meeting the consistency result into reef communicating units, respectively carrying out fluid property and distribution characteristic analysis on all reef unit reservoirs, and carrying out stratum pressure system characteristic analysis, and dividing all reef unit reservoirs meeting the consistency result into the same reservoir communicating unit. The method for dividing the communication units of the biological reef gas reservoir can divide the same reservoir communication unit more objectively, scientifically and reasonably, can provide basis for scientific and reasonable balanced development technical policy of the biological reef gas reservoir, and can specify the development technical policy for each reservoir unit, so that the anhydrous gas production period of the whole biological reef gas reservoir is prolonged, and the stable production period and the production degree are improved.
Description
Technical Field
The invention relates to the technical field of petroleum and natural gas exploration and development, in particular to a method for dividing a communication unit of a biological reef gas reservoir and a method for exploiting the biological reef gas reservoir.
Background
Due to the characteristics of the development of internal pores and holes of the biological reef, the biological reef plays an important role in a carbonate rock oil and gas field with good storage performance and forms a lithologic oil and gas reservoir with complex cause. The whole body of part of oil and gas fields in western regions of China belongs to gentle slope type terrace edge biological reef deposition, and the biological reefs generally have the characteristics of small reef scale, vertical multi-stage superposition and plane distribution and dispersion, so that the reservoir connectivity is poor, the heterogeneity is strong, and the natural gas components, the gas-water relationship and the pressure system are complex.
At present, the exploitation of the biological reef gas reservoir is still an exploitation method through integral exploitation and integral evaluation, and exploitation methods of all gas wells of the biological reef gas reservoir are almost consistent, so that scientific and reasonable balanced exploitation of natural gas at different positions of the biological reef gas reservoir cannot be achieved, and exploitation policies of all gas wells cannot be reasonably adjusted according to actual conditions in the exploitation process, and the exploitation method through integral exploitation and integral evaluation directly causes that the integral stable production period of the biological reef gas reservoir is low, generally only 5-6 years, and after 5-6 years, the gas yield of the biological reef gas reservoir is obviously reduced; meanwhile, the effective exploitation time is short, so that the overall exploitation degree of the biological reef gas reservoir is low, and is generally lower than 45% of the actual gas storage amount.
Therefore, with the continuous and deep development of the biological reef gas reservoir, a guidance method which can provide scientific, reasonable, efficient and stable exploitation for the exploitation of the biological reef gas reservoir is urgently needed, so that the continuous stable yield and high yield of the gas reservoir are guaranteed.
Disclosure of Invention
The invention aims to overcome the defects that the stable production period and the extraction degree of the biological reef gas reservoir are low due to the existing mining method through integral mining and integral evaluation in the prior art, and provides a communicating unit dividing method for the biological reef gas reservoir.
In order to achieve the above purpose, the invention provides the following technical scheme:
a method for dividing a communicating unit of a biological reef gas reservoir comprises the following steps:
step one, dividing a gas layer system into a gas-containing system and an interlayer by aiming at a biological reef gas reservoir;
step two, performing reef connectivity analysis on each reef unit in each gas-bearing layer system in the step one from reef fine portrayal and reservoir continuity characteristics respectively;
Step three, screening according to reef connectivity analysis results of all the reef units in the step two, dividing adjacent reef units meeting reef fine-scale and reservoir continuity characteristic consistency results into reef communication units, and otherwise, dividing the reef units into reef units which are not mutually communicated;
step four, respectively carrying out fluid property and distribution characteristic analysis and formation pressure system characteristic analysis on each reef unit reservoir in the reef communication unit in the step three;
and step five, dividing all reef unit reservoirs meeting the results of the consistency of the fluid properties and the distribution characteristics and the consistency of the characteristics of the stratum pressure system in the step four into the same reservoir communicating unit, otherwise, dividing all reef unit reservoirs into reservoir units which are not mutually communicated, thereby completing the division of the communicating units of the biological reef gas reservoir.
According to the method, a gas layer is divided firstly for the biological reef gas reservoir, then reef connectivity analysis is carried out on all reef units in each gas-containing layer from reef fine portrayal and reservoir continuity characteristics respectively, so that adjacent reef units meeting reef fine portrayal and reservoir continuity characteristic consistency results are divided into reef communication units, then fluid property and distribution characteristic analysis and stratum pressure system characteristic analysis are carried out on all reef unit reservoirs in the reef communication units respectively, all reef unit reservoirs meeting fluid property and distribution characteristic consistency and stratum pressure system characteristic consistency results are divided into the same reservoir communication unit, and therefore the division of the communication units of the biological reef gas reservoir is completed.
It should be noted that the division of the biological reef gas reservoir communication unit related by the invention is not performed under the condition of manual setting, but is performed aiming at the technical problems that no scientific and effective guidance method and no reasonable and efficient and stable exploitation method exist in the prior art for the exploitation of the biological reef gas reservoir, and the provided method can provide a scientific guidance method and an efficient and stable exploitation basis for the exploitation of the existing biological reef gas reservoir, so that the stable production period of the biological reef gas reservoir and the exploitation rate can be improved. The invention comprehensively analyzes and judges according to the consistency of the physical property and the chemical property of each reef unit of the biological reef gas reservoir and combines the characteristics of the reef unit and the reservoir unit, thereby realizing the division of the same reservoir communicating unit.
The method for dividing the biological reef gas reservoir communication unit provided by the invention can more objectively consider the gas storage capacity and the basic characteristics of each position of the biological reef gas reservoir, is more scientific and reasonable in the dividing method and has higher operability, so that a scientific and reasonable exploitation technical policy can be provided for exploitation of the biological reef gas reservoir, an exploitation basis can be provided for studying residual gas distribution and potential evaluation, a guidance basis can be provided for reasonably adjusting the exploitation policy of a reservoir unit according to actual conditions in the exploitation process, and technical support is provided for effectively guaranteeing continuous stable yield and high yield of the biological reef gas reservoir.
Preferably, in the first step, the gas reservoir of the biological reef is divided in a manner of longitudinally spreading along the sequence stratum and transversely spreading along the interlayer, wherein the interlayer is a manner of alternately distributing the gas-containing layer and the interlayer at intervals.
Preferably, in the second step, each reef unit in each gas-containing layer is subjected to reef fine delineation and reservoir continuity characteristic analysis, a method for identifying the reef and the tidal channel according to ancient landforms is adopted to judge whether two adjacent reef units are mutually communicated through the tidal channel, a frequency energy spectrum connectivity of the two adjacent reef units is obtained by a frequency spectrum imaging method to judge whether the two adjacent reef units are communicated, a gamma pseudoacoustic inversion technology is adopted to judge whether the reef units comprise reservoirs or non-reservoirs, and a wave impedance inversion method is adopted to judge the reservoirs and non-reservoirs contained in the reef units.
Preferably, in the third step, the adjacent reef units meet the reef fine-drawing and reservoir continuity characteristic consistency result, specifically, after the result that the two adjacent reef units are mutually communicated through the tidal channel is judged through an ancient landform reef and tidal channel identification method, the judgment is continuously performed by adopting a frequency spectrum imaging method, the frequency energy spectrums of the adjacent reef units are mutually communicated through the frequency spectrum imaging method, the condition that the two adjacent reef units are communicated is met, then a gamma-simulated acoustic inversion technique is adopted, after the result that the reef units both contain the reservoir is obtained, the judgment is finally performed by adopting a wave impedance inversion method, and if the result that the adjacent reef units both contain the reservoir is obtained, the adjacent reef units are reef communication units.
Preferably, the spectral imaging method adopted by the reef units is that biological reef seismic data are extracted from two adjacent reef units respectively as energy spectrums with at least two different frequencies, any sections of the energy spectrums with different frequencies in different directions are extracted to judge the connectivity of the two reef units, if at least one energy spectrum is connected, the two adjacent reef units meet the condition of communication, and if all the energy spectrums are not connected, the two adjacent reef units are not communicated.
Preferably, the fluid property and distribution characteristic analysis is carried out on the reservoir of each reef unit in the reef communication unit in the fourth step, including the analysis of the gas component content and the physical property difference of the adjacent reef communication units, and when the difference of the gas component and the physical property of the adjacent reef communication units is within the error range, the adjacent reef communication units are divided into the same reservoir communication unit; when the biological reef gas reservoir is a water-containing gas reservoir, the analysis of the gas component content and the analysis of the gas-water distribution characteristics are included, and when the gas-water distribution of the adjacent reef body communication units has a uniform gas-water interface and the difference between the gas components and the physical properties of the two reef body communication units is within an error range, the adjacent reef body communication units are divided into the same reservoir layer communication unit.
Preferably, the stratum pressure system characteristic analysis of each reef unit reservoir in the reef communication unit in the fourth step means that the original stratum pressures of each well and each gas-bearing layer are converted to the same altitude depth for comparison by a well logging method, and if the relative difference of the converted pressures of the original strata of each well and each gas-bearing layer is within an error range, the adjacent reef communication units are divided into the same reservoir communication unit.
Preferably, the method for dividing the communication unit for the biological reef gas reservoir further comprises the following five steps: and verifying and evaluating the connectivity of each reservoir unit in the same reservoir communication unit by comparing the dynamic variation consistency characteristics of the formation pressure of each reservoir unit in the same reservoir communication unit in the exploitation process, and if the reservoir units with inconsistency exist, excluding the corresponding reservoir communication units from the reservoir units.
Preferably, the method for verifying gas well production of the connected units divided into the same reservoir in the fifth step comprises the following steps: the early stage pressure drop method is specifically characterized in that the initial measured stratum pressure difference of gas wells which are put into production in different periods of each reservoir unit of the same reservoir communication unit is compared according to the division result of the same reservoir communication unit in the early stage; the pressure profile method is used for comparing the shut-in pressure of each reservoir unit of the same reservoir communication unit, converting the shut-in pressure into the formation pressure value at the same altitude depth, and comparing the descending amplitude and the trend difference of each pressure value; the method specifically comprises the information of whether the adjacent gas wells have the interwell interference in the development process.
The invention also provides a method for exploiting the biological reef gas reservoir, which comprises the following steps of:
the method for dividing the communication unit for the biological reef gas reservoir divides the same reservoir communication unit for the biological reef gas reservoir;
respectively formulating a production method aiming at each same reservoir communication unit, wherein the production of each reservoir unit of the same reservoir communication unit is mutually matched;
step three, in the mining process, performing uninterrupted gas well verification on all reservoir stratum units divided into the same reservoir stratum communication unit, and when all the reservoir stratum units in the same reservoir stratum communication unit meet the consistency characteristic, continuing mining according to the original mining method in the step two; excluding one or more reservoir cells from the same reservoir communication cell when the same reservoir communication cell appears to have the one or more reservoir cells not satisfying the consistency characteristics with other reservoir cells;
step four, readjusting the production method for one or more reservoir units excluded from the step three.
The invention relates to an exploitation method for a biological reef gas reservoir, which comprises the steps of firstly adopting the biological reef gas reservoir communication unit division method to divide the same reservoir communication unit of the biological reef gas reservoir, then respectively formulating an exploitation method for each same reservoir communication unit, wherein the exploitation of each reservoir unit of the same reservoir communication unit is mutually matched or the same exploitation technology is adopted, then in the exploitation process, carrying out uninterrupted verification on each reservoir unit divided into the same reservoir communication unit, and when all the reservoir units in the same reservoir communication unit meet the consistency characteristic, continuing to exploit according to the original exploitation method in the second step; excluding one or more reservoir cells from the same reservoir communication cell when the same reservoir communication cell appears to have one or more of the reservoir cells that do not satisfy the consistency characteristics with other reservoir cells; the production method is then readjusted for one or more of the reservoir cells that are excluded. The mining method fully combines the characteristics of the consistency of the reef unit and the reservoir unit, provides mining basis for scientific and reasonable balanced development of technical policies, residual gas distribution research and potential evaluation of the biological reef gas reservoir, and provides guidance basis for reasonably adjusting the mining policy of the reservoir unit according to actual conditions in the mining process, so that technical support is provided for effectively guaranteeing continuous high yield and stable yield of the biological reef gas reservoir.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the method, a gas layer is divided firstly for the biological reef gas reservoir, then reef connectivity analysis is carried out on all reef units in each gas-containing layer from reef fine portrayal and reservoir continuity characteristics respectively, so that adjacent reef units meeting reef fine portrayal and reservoir continuity characteristic consistency results are divided into reef communication units, then fluid property and distribution characteristic analysis and stratum pressure system characteristic analysis are carried out on all reef unit reservoirs in the reef communication units respectively, all reef unit reservoirs meeting fluid property and distribution characteristic consistency and stratum pressure system characteristic consistency results are divided into the same reservoir communication unit, and therefore the communication unit division of the biological reef gas reservoir is completed; the reef gas reservoir communication unit division fully combines the characteristics of the reef unit and the reservoir unit, the same reservoir communication unit division is more objective, scientific and reasonable, the method is simple and reliable, and the operability is high; the method can provide mining basis for scientific and reasonable balanced development of technical policies, research on residual gas distribution and potential evaluation of the biological reef gas reservoir, and also provides guidance basis for reasonably adjusting the mining policy of a reservoir unit according to actual conditions in the mining process, thereby providing technical support for effectively guaranteeing continuous high yield and stable yield of the biological reef gas reservoir;
2. The invention relates to an exploitation method for a biological reef gas reservoir, which comprises the steps of firstly adopting the biological reef gas reservoir communication unit division method to divide the same reservoir communication unit of the biological reef gas reservoir, then respectively formulating an exploitation method for each same reservoir communication unit, wherein the exploitation of each reservoir unit of the same reservoir communication unit is mutually matched or the same exploitation technology is adopted, then in the exploitation process, carrying out uninterrupted verification on each reservoir unit divided into the same reservoir communication unit, and when all the reservoir units in the same reservoir communication unit meet the consistency characteristic, continuing to exploit according to the original exploitation method in the second step; excluding one or more reservoir cells from the same reservoir communication cell when the same reservoir communication cell appears to have the one or more reservoir cells not satisfying the consistency characteristics with other reservoir cells; the production method is then readjusted for one or more of the reservoir cells that are excluded. The mining method fully combines the characteristics of the consistency of the reef unit and the reservoir unit, provides mining basis for scientific and reasonable balanced development of technical policies, residual gas distribution research and potential evaluation of the biological reef gas reservoir, and provides guidance basis for reasonably adjusting the mining policy of the reservoir unit according to actual conditions in the mining process, so that technical support is provided for effectively guaranteeing continuous high yield and stable yield of the biological reef gas reservoir.
Description of the drawings:
fig. 1 is a flow chart of a method for dividing a communicating unit for a gas reservoir of a biological reef in accordance with the present invention;
FIG. 2 is a schematic diagram showing the development of the longitudinal interlayers in the gas reservoir of the biological reef in example 3;
FIG. 3 is a schematic diagram of the spectral imaging method used in example 3 to determine the reservoir connectivity between reef units;
fig. 4 is a plan view of reef-carrying group division formed by reef units in example 3;
fig. 5 is a sectional view of reef-carrying group division formed by reef units in example 3;
FIG. 6 is a schematic view of reef communicating units of the biological reef gas reservoir according to example 3;
FIG. 7 is a drawing of a reef cluster formed by reef communicating units in a reef flat overlapping area in example 3;
FIG. 8 is a reef belt pressure gradient distribution diagram formed by connection units of reef No. 4 in example 3;
FIG. 9 is a view showing a reef belt pressure gradient distribution diagram formed by connection units of each reef No. 3 in example 3;
FIG. 10 is the pressure gradient distribution of the reef flat overlap area in example 3;
fig. 11 is a schematic diagram of a reef body communicating unit of an organism reef gas reservoir in example 3;
FIG. 12 is a cross-sectional view of the reef belt formed by the reef communication units of EXAMPLE 3;
FIG. 13 is a graph of gas production from the 204-1H well and the 204-2H well in example 3;
FIG. 14 is a pressure profile of 205 a well reef cluster in example 3;
FIG. 15 is a distribution diagram of dynamic inter-well communication units in a reef phase region of a region of the bio-reef gas reservoir.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. It should be understood that the scope of the above-described subject matter is not limited to the following examples, and any techniques implemented based on the disclosure of the present invention are within the scope of the present invention.
Example 1
As shown in fig. 1, a method for dividing a communicating unit of a biological reef gas reservoir comprises the following steps:
step one, dividing a gas layer system into a gas-containing system and an interlayer by aiming at a biological reef gas reservoir;
step two, performing reef connectivity analysis on each reef unit in each gas-bearing layer system in the step one from reef fine portrayal and reservoir continuity characteristics respectively;
step three, screening according to reef connectivity analysis results of all the reef units in the step two, dividing adjacent reef units meeting reef fine-scale and reservoir continuity characteristic consistency results into reef communication units, and otherwise, dividing the reef units into reef units which are not mutually communicated;
step four, respectively carrying out fluid property and distribution characteristic analysis and formation pressure system characteristic analysis on each reef unit reservoir in the reef communication unit in the step three;
Step five, dividing all reef unit reservoirs meeting the results of the consistency of fluid properties and distribution characteristics and the consistency of stratum pressure system characteristics in the step four into the same reservoir communication unit, otherwise, dividing all reef unit reservoirs into reservoir units which are not mutually communicated, thereby completing the division of the communication units of the biological reef gas reservoir.
The method comprises the following steps of dividing a biological reef gas reservoir in a mode of longitudinally spreading the gas reservoir along a sequence stratum and transversely spreading an interlayer, wherein the interlayer is a mode of alternately distributing gas-containing layers and interlayers, according to statistical analysis of data, the interlayer packing effect is strong, the transverse distribution is stable, the general thickness is greater than 20m, and the reservoir layer clamped by two partition walls is a set of gas-containing layers.
In the second step, the reef units in each gas-containing layer are subjected to reef fine portrayal and reservoir continuity characteristic analysis, an ancient landform reef and tidal channel identification method is adopted to judge whether two adjacent reef units are mutually communicated through the tidal channel, a frequency spectrum imaging method is adopted to obtain frequency energy spectrum connectivity of the adjacent reef units to judge whether the two adjacent reef units are communicated, a gamma pseudoacoustic inversion technology is adopted to judge whether the reef units comprise reservoirs or non-reservoirs, and a wave impedance inversion method is adopted to judge whether the reservoirs or the non-reservoirs comprise the reef units.
Further, in the third step, the adjacent reef units meet the reef fine-drawing and reservoir continuity characteristic consistency result, specifically, after the result that the two adjacent reef units are mutually communicated through the tidal channel is judged through an ancient landform reef and tidal channel identification method, the judgment is continuously carried out by adopting a frequency spectrum imaging method, the frequency energy spectrums of the adjacent reef units are mutually communicated through the frequency spectrum imaging method, the condition that the two adjacent reef units are communicated is met, then, a gamma pseudoacoustic inversion technique is adopted, after the result that the reef units both contain the reservoir is obtained, the judgment is finally carried out by adopting a wave impedance inversion method, and if the result that the adjacent reef units both contain the reservoir is obtained, the adjacent reef units are reef communication units.
The four methods are as follows:
the ancient landform analysis technology comprises the following steps: the reef body and the tidal channel of the biological reef gas reservoir can be identified through ancient landforms, the biological reef on the seismic section is of a hilly appearance (convex) reflection characteristic, according to data statistics, the dip angle of the hilly appearance of the biological reef is generally larger than 8-17 degrees, and the tidal channel is of a parallel-sub-parallel type reflection characteristic; the difference between the deposition thicknesses of the biological reefs and the tidal channel reaches 80-100 meters, and the width on the plane of the tidal channel is 200-600 meters, wherein the difference between the deposition thicknesses of the biological reefs and the tidal channel is more than 100 meters, so that the tidal channel is judged to be formed between reef units of adjacent biological reefs and is not communicated with each other; when the width of the tidal channel is more than 200 meters, the reef units of the adjacent biological reefs are not communicated. Only when the difference between the deposition thicknesses of the adjacent biological reef units and the development tidal channel is less than 100 meters, and the width of the tidal channel between the adjacent biological reef units is less than 200 meters, judging that the two adjacent reef units meet the condition that the adjacent reef units are communicated with each other;
A spectrum imaging technology: the principle is to detect small discontinuity according to the tuning principle of thin layer reflection, biological reef seismic data are extracted from two adjacent reef units respectively to form energy spectrums with at least two different frequencies, any section of the energy spectrums with different frequencies in different directions is extracted to judge the connectivity of the two reef units, if at least one energy spectrum is connected, the two adjacent reef units meet the condition of communication, and if all the energy spectrums are not connected, the two adjacent reef units are not communicated. The method can extract a plurality of energy spectrums with different frequencies of the biological reef seismic data body, then extract any line of the energy spectrums with different frequencies in different directions to judge the connectivity between reefs, if all the frequency energy spectrums are not connected, two adjacent reef units can be judged to be not connected, otherwise, if at least one or more frequency energy spectrums are connected, the condition that the two reef units are connected with each other can be judged to be met.
③ a gamma quasi-acoustic wave inversion technique: the core of the inversion technique is characteristic curve reconstruction, which is based on rock physics, selects from various well logging curves, and reconstructs a curve capable of reflecting reservoir characteristics. Based on gamma simulation acoustic curve reconstruction, firstly extracting low-frequency information of an acoustic logging curve by utilizing wavelet transformation; then, extracting high-frequency information of the gamma curve by using a statistical regression method; and finally, constructing a pseudo-acoustic curve which not only has low-frequency information of a stratum background, but also can reflect the difference between a reservoir and a non-reservoir by adopting a frequency fusion technology. In specific operation, the reconstructed gamma simulated sound waves are intersected with the density curve, and most of non-reservoirs containing argillaceous substances can be separated from the reservoirs. The result of the petrophysical analysis shows that the non-reservoir containing the argillaceous substances and the reservoir have obvious distinction on a gamma-pseudoacoustic wave curve, and the gamma data are obtained through a gamma-pseudoacoustic wave inversion technology, so that the influence of the non-reservoir containing the argillaceous substances on the reservoir result judgment can be eliminated, and the inversion multi-solution property is reduced. A large amount of experimental data statistics shows that when the inverted gamma is larger than 29, the reservoir is regarded as a non-reservoir with higher mud content, so that the reef unit of the reservoir can be judged to contain the reservoir by utilizing the threshold range of the gamma value (when the gamma value is smaller than 29), and the adjacent reef units are reef communication units.
Wave impedance inversion technique: according to a large amount of data statistics, the wave impedance value of the gas-containing layer section of the biological reef reservoir is generally less than 16500g/cm 3 M/s, then taking the data of the wave impedance value as a reference, when the wave impedance value inversion is carried out on the reef unit of the biological reef, the wave impedance values obtained when the adjacent reef units are all less than 16500g/cm 3 And when m/s is required, the adjacent reef units can be judged to be reef communication units which are communicated with each other. The gamma-simulated acoustic wave inversion technology adopted in the third step and the condition of the marl non-reservoir stratum which can also meet the requirement of the wave impedance value are eliminated, so that the result of whether the adjacent reef units have the mutually communicated reef communication units or not obtained by the wave impedance inversion technology in the fourth step is more accurate.
It should be noted that the four methods for performing reef body fine description and reservoir continuity characteristics on the reef body unit belong to a reexamination and evaluation stage of the reef body unit, and are in a layer-by-layer progressive relationship, that is, the reef body unit needs to meet the evaluation result of the ancient landform analysis technology, then the judgment of the frequency spectrum imaging technology is performed, the gamma sound wave simulation inversion technology is performed after the condition is met, and finally the wave impedance inversion technology is performed after the gamma value meets the requirement, and when the wave impedance values of the reef body unit also meet the requirement, the conclusion that the adjacent reef body unit is the static connectivity analysis of the reef body communication unit can be made.
Then, performing fluid property and distribution characteristic analysis on the storage layer of each reef unit in the reef communication unit in the fourth step, wherein the fluid property and distribution characteristic analysis comprises the analysis on the gas component content and the physical property difference of the adjacent reef communication units, and when the gas component and the physical property difference of the adjacent reef communication units are within an error range, the adjacent reef communication units are divided into the same storage layer communication unit; for example, if the gas reservoir of the biological reef is a sulfur-containing gas reservoir, then the emphasis is on comparing the wells H 2 The difference of S content and the similarity of the physical properties of the gas mean that the contents of all components are close, and through a large number of experimental statistics, when the error of the contents of the components of the gas is less than 10%, the reservoir units meeting the reef unit are the same reservoir communication unit. When the biological reef gas reservoir is a water gas reservoir, the gas component content is analyzed, the gas-water distribution characteristics are also analyzed, the gas-water distribution of the biological reef communication unit has the block-shaped bottom water gas reservoir characteristics, and when the gas-water distribution of the adjacent reef communication units has a uniform gas-water interface and the difference between the gas components and the physical properties of the two gas-water interfaces is within an error range, the adjacent reef communication units are divided into the same reservoir communication unit.
The stratum pressure system characteristic analysis of each reef unit reservoir in the reef communication unit in the fourth step means that the original stratum pressures of each well and each gas-containing system are converted to the same altitude depth for comparison by a well logging method, if the relative pressure difference after the conversion of the original stratum of each well and each gas-containing system is within an error range, the adjacent reef communication units are divided into the same reservoir communication unit, wherein the error range is obtained according to a large amount of experimental data, if the experimental data shows that the relative pressure error after the conversion of the original stratum of each well and each gas-containing system is less than 5%, the adjacent reef communication units are the same reservoir communication unit, and whether the relative pressure error after the conversion of the original stratum of each well and each gas-containing system is less than 5% can be used as a reference value for evaluation.
In addition, the method for dividing the communication unit for the biological reef gas reservoir further comprises the following five steps: and verifying and evaluating the connectivity of each reservoir unit in the same reservoir communication unit by comparing the dynamic variation consistency characteristics of the formation pressure of each reservoir unit in the same reservoir communication unit in the exploitation process, and if the reservoir units with inconsistency exist, excluding the corresponding reservoir communication units from the reservoir units.
Particularly, the method for verifying gas well exploitation on the connected units divided into the same reservoir in the fifth step comprises the following steps:
a. the early stage pressure drop method is specifically characterized in that the initial measured stratum pressure difference of gas wells which are put into production in different periods of each reservoir unit of the same reservoir communication unit is compared according to the division result of the same reservoir communication unit in the early stage;
b. the pressure profile method is used for comparing the well shut-in pressure of each reservoir unit of the same reservoir communication unit, converting the well shut-in pressure into the formation pressure value at the same altitude depth, comparing the difference of the descending amplitude and the trend of each pressure value, and acquiring the relative error such as 5% as a reference value according to a large amount of experimental data;
c. the method specifically comprises the information of whether the adjacent gas wells have the interwell interference in the development process.
According to the method, a gas layer is divided firstly for the biological reef gas reservoir, then reef connectivity analysis is carried out on all reef units in each gas-containing layer from reef fine portrayal and reservoir continuity characteristics respectively, so that adjacent reef units meeting reef fine portrayal and reservoir continuity characteristic consistency results are divided into reef communication units, then fluid property and distribution characteristic analysis and stratum pressure system characteristic analysis are carried out on all reef unit reservoirs in the reef communication units respectively, all reef unit reservoirs meeting fluid property and distribution characteristic consistency and stratum pressure system characteristic consistency results are divided into the same reservoir communication unit, and therefore the communication unit division of the biological reef gas reservoir is completed; the reef gas reservoir communication unit division fully combines the characteristics of the reef unit and the reservoir unit, the same reservoir communication unit division is more objective, scientific and reasonable, the method is simple and reliable, and the operability is high; the method can provide mining basis for scientific and reasonable balanced development of technical policies, residual gas distribution research and potential evaluation of the biological reef gas reservoir, and also provides guidance basis for the mining policy of reasonably adjusting reservoir units according to actual conditions in the mining process, thereby providing technical support for effectively guaranteeing continuous high yield and stable yield of the biological reef gas reservoir.
Example 2
The invention also provides a method for exploiting the biological reef gas reservoir, which comprises the following steps:
the method for dividing the communication unit for the biological reef gas reservoir divides the same reservoir communication unit for the biological reef gas reservoir;
respectively formulating a production method aiming at each same reservoir communication unit, wherein the production of each reservoir unit of the same reservoir communication unit is mutually matched;
step three, in the mining process, performing uninterrupted gas well verification on all reservoir stratum units divided into the same reservoir stratum communication unit, and when all the reservoir stratum units in the same reservoir stratum communication unit meet the consistency characteristic, continuing mining according to the original mining method in the step two; excluding one or more reservoir cells from the same reservoir communication cell when the same reservoir communication cell appears to have the one or more reservoir cells not satisfying the consistency characteristics with other reservoir cells;
step four, readjusting the production method for one or more reservoir units excluded from the step three.
The invention relates to an exploitation method for a biological reef gas reservoir, which comprises the steps of firstly adopting the biological reef gas reservoir communication unit division method to divide the same reservoir communication unit of the biological reef gas reservoir, then respectively formulating an exploitation method for each same reservoir communication unit, wherein the exploitation of each reservoir unit of the same reservoir communication unit is mutually matched or the same exploitation technology is adopted, then in the exploitation process, carrying out uninterrupted verification on each reservoir unit divided into the same reservoir communication unit, and when all the reservoir units in the same reservoir communication unit meet the consistency characteristic, continuing to exploit according to the original exploitation method in the second step; excluding one or more reservoir cells from the same reservoir communication cell when the same reservoir communication cell appears to have the one or more reservoir cells not satisfying the consistency characteristics with other reservoir cells; the production method is then readjusted for one or more of the reservoir cells that are excluded. The mining method fully combines the characteristics of the consistency of the reef unit and the reservoir unit, provides mining basis for scientific and reasonable balanced development of technical policies, residual gas distribution research and potential evaluation of the biological reef gas reservoir, and provides guidance basis for reasonably adjusting the mining policy of the reservoir unit according to actual conditions in the mining process, so that technical support is provided for effectively guaranteeing continuous high yield and stable yield of the biological reef gas reservoir.
Example 3
This embodiment 3 is a method for dividing a communication unit of a gas layer system of a certain domestic biological reef gas reservoir, comprising the following steps:
1. divide the gas layer of the biological reef gas reservoir into: dividing 3 sets of gas-containing layers from bottom to top, and as shown in table 1, developing the bottom of the lower section of the gas reservoir of the biological reef set 1, namely a reservoir layer 1-gas-containing layer 1; the 2 nd set is positioned at the top of the upper section of the gas reservoir of the biological reef, namely a No. 2 reservoir-gas-bearing layer system 2; the 3 rd set develops in the upper section of the gas reservoir of the biological reef, namely a reservoir body 3 and a reservoir body 4, namely a gas-bearing layer system 3, which is shown in a figure 2.
TABLE 1 domestic partitioning scheme of longitudinal gas-bearing layer system of certain biological reef gas reservoir
2. And performing reef connectivity analysis on each reef unit in each gas-bearing layer system from reef fine portrayal and reservoir continuity characteristics respectively, wherein the reef connectivity analysis comprises the following steps:
2.1 a method for dividing a static reef body communicating unit, aiming at a water and gas reservoir at the bottom of a certain biological reef in China, the research on the division of the static communicating unit is mainly analyzed from the following three aspects:
firstly, in the aspect of the distribution and connectivity of the reef units, the distribution and connectivity of the reef units are described by adopting the ancient landform analysis technology, the frequency spectrum imaging technology, the gamma simulated acoustic wave inversion technology, the wave impedance inversion technology and other technologies; when a spectral imaging technology is used, as shown in fig. 3, energy spectrums of 15Hz, 25Hz and 30Hz of the biological reef seismic data body can be extracted, then any line of energy spectrums with different frequencies in different directions is extracted to judge connectivity between reefs, if the energy spectrums with 3 frequencies are not connected, two adjacent reef units can be judged to be not connected, otherwise, if at least one or more frequency energy spectrums are connected, the condition that the two reef units are connected with each other can be judged to be met;
In the aspect of fluid property and distribution, the connectivity of adjacent reef units is judged by analyzing the change condition of the fluid property and the gas-water distribution characteristics in the original and development processes of the biological reef gas reservoir;
and thirdly, in the aspect of pressure system analysis, the original formation pressures of all wells and layers are converted to the same altitude depth for comparison, so that the connectivity is judged.
(1) Reservoir continuity analysis
4 North-West-south-east biological reef belts and 1 reef flat overlapped area are co-developed on the plane of the reef phase area in a certain area. Each reef belt is composed of a plurality of reef groups, the continuity of reservoirs in the reef groups is good, the reef groups are separated by tidal channels, and the continuity of the reservoirs is poor, as shown in figures 4 and 5. Therefore, the tidal channel can be used as a basis for dividing different communicated units in the same reef belt, and when the width of the tidal channel on the plane is larger than 600 meters, two adjacent reef body units are not communicated. With reference to fig. 11, take the reef belt of fig. 11 c as an example: as is obvious from the seismic section and the reef distribution diagram, tidal paths exist among reef groups 204, 205 and 29-2 in the production area, and reservoirs among the three reef groups are discontinuous and can be divided into three reef units, as shown in fig. 5 and 6.
It should be noted that, in the same reef band, even if the reef cover reservoir is discontinuous or the reservoir is thinned, as long as the stratum is not lost or fault separation and the stratum and the reservoir are continuously distributed, the reservoir is considered to have a connected geological foundation. Taking the reef belt # of fig. 11 as an example, the reef belt develops 3 large reef groups, and as seen from the analysis of the phase profile passing through the highest part of the biological reef and along the trend of the reef belt, the top parts of the reef belt reef covers have the same phase and the continuous and stable phase, and only have small movement in local parts, which indicates that the reef belt covers are continuous and stable, so that the reef belt # is integrally taken as a communicating unit.
According to the principle and method, the reef belt II in FIG. 11 can be divided into 3 reef groups and 2 communicating units, including a 101H reef group and a 103H reef group which are divided into 1 communicating unit; dividing the reef belt into 5 reef groups and 5 communicating units, wherein the reef groups comprise 4 reef groups in a construction area and 1 reef group outside the construction area; the reef flat overlapping area is divided into 3 reef groups and 3 communicating units, as shown in fig. 7, including 2 in the construction area and 1 outside the construction area.
(2) Fluid property and distribution profile analysis
(2.1) fluid Property analysis
The biological reef gas reservoir of the Changxing group in a certain country is a high-sulfur-content gas reservoir, and each well produces H in natural gas 2 S content is compared as shown in Table 2. Four # reef belt each well H 2 The S content is close to each other and can be used as evidence for the communication of the reef belt reservoir; thirdly, three gas wells H with 204 reef groups 2 S content is obviously lower than that of other gas wells in the reef belt, namely 101 well test in the reef belt No.H 2 The S content is obviously lower than that of other gas wells in the reef belt, and the fact that 204 reef groups and 101 reef groups are independent units is further verified; reef belt with reef group H 2 The content of S is greatly changed; each well H in reef flat superposed area 2 The S content is close to the whole.
Table 2 each individual well H of the gas reservoir of the changxing group of gas fields 2 S content comparison table
(2.2) analysis of gas-water distribution characteristics
Through well logging explanation, the difference between gas-water interfaces of the 29-2 well and the 28 well is 38.2m, and the reef groups where the two wells are located are not considered to belong to the same gas-water system, so that the 29-2-28 reef group for analyzing the reservoir continuity into one unit is divided into two communicated units. In addition, the gas-water interfaces are different for well logging explanation of the reef belt, and the reef belt with 5 reef groups belongs to different reservoir communicating units.
(3) Pressure system analysis
Static pressure gradient analysis is carried out by using the formation static pressure monitoring data, and whether the gas well is in a communication system or not can be judged. Gas wells in the same interconnected system may have different well depths, but the measured formation pressure should be distributed along the static pressure gradient of the gas, or along the same "natural gas static pressure gradient line".
And preliminarily researching the connectivity of the reef belt III and the reef belt III by combining the actually measured downhole static pressure and pressure recovery data of the gas reservoir of the Changxing group. At present, 10 wells with 3 reefs have static pressure monitoring data, and the pressure of a measuring point is converted into the formation pressure corresponding to the depth of the middle part of each well gas layer, as shown in table 3.
TABLE 3 statistics table for the gas reservoir burial depth and the formation pressure of Changxing group
From the relationship graph of the formation pressure and the altitude and the depth of the middle part of the gas layer, the reef belt No. 3 wells are positioned on the same static pressure gradient line and can be regarded as the same pressure system, and the graph is shown in FIG. 7. Thirdly, the 29 reef belt groups and the 28 reef group 4 wells are positioned on the same static pressure gradient line, and the 204 reef group pressure gradients are different. The reef belt # r, the reef cluster 204 and the reef cluster 28-29 can be independent pressure systems through pressure gradient analysis, as shown in fig. 9. The original formation pressure of the 3 wells in the reef flat overlapped area has no obvious linear relation with the gas reservoir altitude depth, as shown in fig. 10, which reflects that the connectivity of the reefs in the area is poor.
2. Static connected cell partitioning results
According to the reef fine-drawing result, reservoir continuity analysis, and comprehensive analysis of static data such as fluid properties, gas-water interface, stratum pressure gradient, etc., the 31-port production well region of the area Changxing group gas reservoir reef unit phase region is divided into 11 communicating units, as shown in FIG. 11.
3. Dynamic connectivity analysis
The dynamic connectivity analysis, namely the connectivity analysis of each reservoir unit in the same reef communication unit, comprises the following steps: (1) along with the extraction of oil gas and the gradual expansion of the pressure drop funnel, the formation pressure is gradually reduced, and the formation pressure of a new well drilling test in the later period of exploitation is lower than the formation pressure of an early drilling well drilling test and is changed regularly; (2) the adjacent wells have an inter-well interference phenomenon in the development process, and the adjacent wells can observe inter-well interference information; (3) interconnected wells should have the same magnitude and tendency to decrease in pressure. Taking the reef belt with the number III as an example, the connectivity analysis of dynamic data is developed.
1. 'four' reef belt
As can be seen from the pressure profile of the 5-mouth gas well at the high part of the reef belt No. H, as shown in FIG. 12, the pressure difference of each well is not large at the initial stage of production, but as the production progresses, the pressures of the 27-1H and 27-2 wells are obviously lower than those of the 27-3H, 271 and 272-1H, reflecting the characteristic that the two wells are poorly communicated.
In a logging experiment, the 27-2 wells are normally produced, the 27-1H wells are shut down for 36 days, the pressure of the well head is reduced from 45.2MPa to 44.9MPa, and the phenomenon opposite to the normal pressure recovery trend appears. Indicating that the 27-1H well was disturbed by the production well 27-2, indicating that the two wells are connected. And 8, in 2018, a 27 well zone in 8 months produces 1 new well 27-4, the initial shut-in pressure of the well is 41.8MPa, the converted formation pressure is 58.13MPa, the initial shut-in pressures of the adjacent wells 27-1H and 27-2 are 49.2MPa and 49.8MPa respectively, and the formation pressure is about 68MPa, which indicates that the 27-4 well has the early pressure drop and is communicated with the adjacent wells 27-1H and 27-2.
2. 204 reef cluster
(1) The last production well has a pressure drop in advance, and the communication between the wells is verified
204 reef cluster has 2 wells, wherein 204-1H well is put into production in 12 months 2014, and the original formation pressure is 66.16 MPa; when the 204-2 well is put into production in 2016, the original formation pressure is only 58.15MPa, and the formation pressure is reduced by 8MPa compared with that of the first production well, which indicates that the two wells are communicated.
(2) The well interference further proves that the connectivity of the two wells is good
Before 204-2 wells are put into production, only 204-1H production wells are arranged in the reef cluster, the pressure drop rate of the 204-1H wells is 0.02MPa/d when 65 ten thousand square/day of production is allocated to the 204-2 wells, the production oil pressure drop rate of the 204-1H wells is obviously accelerated after the 204-2 wells are put into production, the pressure drop rate reaches 0.03MPa/d when 57 ten thousand square/day of production is allocated to the 204-2 wells, and the oil pressure levels and the pressure drop trends of the two wells tend to be consistent, as shown in figure 13.
The well closing pressure of the 204-1H well is in a linear descending trend, an obvious inflection point appears on the well closing pressure of the 204-1H well shortly after the 204-2 well is put into production, the pressure descending speed is accelerated, the 204-2 pressure wave coverage range of the later production is gradually enlarged and is overlapped with a pressure descending funnel formed by the 204-1H well, so that the 204-1H well is pressed down, and the pressure descending trends of the two wells gradually tend to be consistent. Based on the analysis, the 204-2 well produces obvious interference on 204-1H after production, and the two wells have good connectivity.
3. 205 reef cluster
(1) Pressure profiling demonstrated poor connectivity between the 205 well and the 29 well
From the pressure profile of the hermatumus gas well, as shown in fig. 14, the formation pressure of each well is close at the initial production stage, the pressure drop of the 3 wells of the 205 well zone tends to be consistent with that of the 2 wells of the 29 well zone tends to be consistent with that of the production, but the difference between the formation pressures of the two well zones at the same time is close to 4MPa, which indicates that the connectivity between the two well zones is poor.
(2)205 the pressure of the initially-measured stratum of each well of the well zone is regularly reduced along with the production time, which indicates that the well zone connectivity is good
4 gas wells are successively produced in 205 well zones, the pressure of the original formation of the first 2 wells which are produced in 12 months in 2014 is 65-67MPa, the pressure of the original formation of the gas wells is reduced to 61.65MPa when 205-2 wells are produced in 7 months in 2016, and the pressure of the original formation of the 205-3 wells which are produced in 8 months in 2017 is only 55.31MPa, as shown in the following table 4. The pressure of the initial formation logging of each well in the well zone is regularly reduced along with the production time, and the fact that the connectivity of each well in the well zone is good is proved 205.
TABLE 4205 initial formation pressure comparison table for each well in well
| Number of well | Time of delivery | Initial measurement of formation pressure (MPa) |
| 205-1 | 12 months 2014 | 67.16 |
| 205 | 12 months 2014 | 65.94 |
| 205-2 | 2016 (7 months) year | 61.65 |
| 205-3 | 8 months in 2017 | 55.31 |
4. Rock belt
The original formation pressure of the 103-1H well in the later production is only 60.78MPa and is far lower than the original formation pressure (67.12MPa) of the 103H well in the adjacent well, the reflection reserves are used passively, and the two wells are communicated. And pressure interference also exists in the production process, the oil pressure is reduced by nearly 1MPa in 2017 in 1 month and in 103-1H for 36 days of closing the well, and the fact that the two wells are communicated is also proved.
5. Yihao reef belt
The reef belt is internally provided with 3 gas wells, wherein 10-1H and 10-2H are in the same reef cluster, and as the two gas wells produce water, the effective well opening time is short, and the 10-2H well is in a shutdown state for a long time, so that the communication relation of the two wells is difficult to judge from production data.
6. Reef flat superposition area
The area of the 102-2H well is an independent small reef body and is not communicated with other areas of the superposed region. The 1 well on side 102 belongs to a low-pressure and low-yield well, is far from the production capacity of other gas wells, and is judged to be an independent hypotonic region. The basis of inter-well communication is not found in the wells 102-1H, 102-3H and 104, and the communication relationship of the superposed regions is yet to be further implemented.
Determining 27-1H and 27-2 well regions of the northwest reef belt No. iv according to the inter-well connectivity analysis method; thirdly, 204 reef groups are arranged on the reef belt; ③ the West-north 205 well area of the reef belt; ③ the reef belt southeast 29 well area; and secondly, 5 wells of the 103H reef belt and the 103-1H well zone are communicated with each other among wells, as shown in FIG. 15, the wells can be divided into 5 flowing units, and the communication among the other communicated units is good and needs to be further verified according to dynamic production data.
The above embodiments are only used for illustrating the invention and not for limiting the technical solutions described in the invention, and although the present invention has been described in detail in the present specification with reference to the above embodiments, the present invention is not limited to the above embodiments, and therefore, any modification or equivalent replacement of the present invention is made; all such modifications and variations are intended to be included herein within the scope of this disclosure and the appended claims.
Claims (10)
1. A method for dividing a communicating unit of a biological reef gas reservoir is characterized by comprising the following steps:
step one, dividing a gas layer system into a gas-containing system and an interlayer by aiming at a biological reef gas reservoir;
step two, performing reef connectivity analysis on each reef unit in each gas-bearing layer system in the step one from reef fine portrayal and reservoir continuity characteristics respectively;
step three, screening according to reef connectivity analysis results of all the reef units in the step two, dividing adjacent reef units meeting reef fine-scale and reservoir continuity characteristic consistency results into reef communication units, and otherwise, dividing the reef units into reef units which are not mutually communicated;
step four, respectively carrying out fluid property and distribution characteristic analysis and formation pressure system characteristic analysis on each reef unit reservoir in the reef communication unit in the step three;
and step five, dividing all reef unit reservoirs meeting the results of the consistency of the fluid properties and the distribution characteristics and the consistency of the characteristics of the stratum pressure system in the step four into the same reservoir communicating unit, otherwise, dividing all reef unit reservoirs into reservoir units which are not mutually communicated, thereby completing the division of the communicating units of the biological reef gas reservoir.
2. The method for dividing the communicating unit of the bio-reef gas reservoir according to claim 1, wherein in the first step, the bio-reef gas reservoir is divided in a manner that the gas-bearing layer and the interlayer are distributed in a staggered manner along a longitudinal direction of the layer sequence layer and in a transverse direction of the layer sequence layer.
3. The method for dividing the communicating unit for the biological reef gas reservoir as claimed in claim 1, wherein in the second step, the reef units in each gas-containing layer are subjected to reef fine drawing and reservoir continuity characteristic analysis, and the method of identifying reefs and tidal channels by ancient landforms is adopted to judge whether two adjacent reef units are communicated with each other through the tidal channels, the frequency energy spectrum connectivity of the adjacent reef units is obtained by a frequency spectrum imaging method to judge whether the two adjacent reef units are communicated, the gamma pseudoacoustic inversion technology is adopted to judge whether the reef units comprise reservoirs or non-reservoirs, and the wave impedance inversion method is adopted to judge whether the reservoirs or non-reservoirs comprise the reef units.
4. The method for dividing a communicating unit for a bio-reef gas reservoir according to claim 3, it is characterized in that in the third step, the adjacent reef units meet the reef fine-drawing and reservoir continuity characteristic consistency result, in particular after the results that the two adjacent reef units are mutually communicated through the tidal passage are judged by a method of identifying reefs and tidal passages through ancient landforms, then the judgment is continued by adopting a frequency spectrum imaging method, the frequency energy spectrums of the adjacent reef units obtained by the frequency spectrum imaging method are mutually communicated, if the condition that two adjacent reef units are communicated is met, then the gamma quasi-acoustic inversion technology is adopted, when the results that the reef units all contain the reservoir are obtained, the judgment is finally carried out by adopting a wave impedance inversion method, and if the result that all the adjacent reef units contain the reservoir is obtained, the adjacent reef units are reef communication units.
5. The method for dividing the communicating unit for the biological reef gas reservoir as claimed in claim 3, wherein the reef units adopt a spectral imaging method which extracts the biological reef seismic data as at least two energy spectra of different frequencies for two adjacent reef units respectively, extracts any one section of the energy spectra of different frequencies in different directions to judge the connectivity of the two reef units, if at least one energy spectrum is connected, the two adjacent reef units satisfy the condition of communication, and if all the energy spectra are not connected, the two adjacent reef units are not connected.
6. The method for dividing the communicating units for the biological reef gas reservoir according to claim 1, wherein the fluid property and distribution characteristic analysis of each reef unit reservoir in the reef communicating units in the fourth step comprises the analysis of the gas component content and the physical difference of adjacent reef communicating units, and when the gas component and the physical difference of the adjacent reef communicating units are within an error range, the adjacent reef communicating units are divided into the same reservoir communicating unit; when the biological reef gas reservoir is a water-containing gas reservoir, the analysis of the gas component content and the analysis of the gas-water distribution characteristics are included, and when the gas-water distribution of the adjacent reef body communication units has a uniform gas-water interface and the difference between the gas components and the physical properties of the two reef body communication units is within an error range, the adjacent reef body communication units are divided into the same reservoir layer communication unit.
7. The method for dividing the communicating units for the biological reef gas reservoir as claimed in claim 1, wherein the formation pressure system characteristic analysis of each reef unit reservoir in the reef communicating units in the fourth step means that the original formation pressures of each well and each gas-bearing layer are converted to the same altitude depth for comparison by a well logging method, and if the relative pressure difference after the conversion of the original formation of each well and each gas-bearing layer is within an error range, the adjacent reef communicating units are divided into the same reservoir communicating unit.
8. The method for partitioning a communicating unit for a bio-reef gas reservoir according to any one of claims 1 to 7, further comprising the step of: and verifying and evaluating the connectivity of each reservoir unit in the same reservoir communication unit by comparing the dynamic variation consistency characteristics of the formation pressure of each reservoir unit in the same reservoir communication unit in the exploitation process, and if the reservoir units with inconsistency exist, excluding the corresponding reservoir communication units from the reservoir units.
9. The method for dividing the communicating units of the biological reef gas reservoir according to claim 8, wherein the method for verifying gas well production of the communicating units divided into the same reservoir in the fifth step comprises the following steps: the early stage pressure drop method is specifically characterized in that the initial measured stratum pressure difference of gas wells which are put into production in different periods of each reservoir unit of the same reservoir communication unit is compared according to the division result of the same reservoir communication unit in the early stage; the pressure profile method is used for comparing the shut-in pressure of each reservoir unit of the same reservoir communication unit, converting the shut-in pressure into the formation pressure value at the same altitude depth, and comparing the descending amplitude and the trend difference of each pressure value; the method specifically comprises the information of whether the adjacent gas wells have the interwell interference in the development process.
10. A method for mining a bio-reef gas reservoir, comprising the steps of:
the method for dividing the communication unit for the biological reef gas reservoir comprises the steps of firstly, dividing the same reservoir communication unit for the biological reef gas reservoir by adopting the method for dividing the communication unit for the biological reef gas reservoir according to any one of claims 1 to 7;
respectively formulating a production method for each same reservoir communication unit, wherein the production methods of the reservoir units of the same reservoir communication unit are mutually matched;
Step three, in the mining process, performing uninterrupted gas well verification on all reservoir stratum units divided into the same reservoir stratum communication unit, and when all the reservoir stratum units in the same reservoir stratum communication unit meet the consistency characteristic, continuing mining according to the original mining method in the step two; excluding one or more reservoir cells from the same reservoir communication cell when the same reservoir communication cell appears to have the one or more reservoir cells not satisfying the consistency characteristics with other reservoir cells;
step four, readjusting the production method for one or more reservoir units excluded from the step three.
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