CN110443719B - Evaluation method of ancient buried hill mature-hiding profitable area - Google Patents
Evaluation method of ancient buried hill mature-hiding profitable area Download PDFInfo
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Abstract
The invention relates to an evaluation method of an ancient buried hill adult-hiding favorable zone. The evaluation method comprises the steps of determining zones and stratum positions of high-quality hydrocarbon source rocks in basin development, determining main hydrocarbon discharge threshold depth of the high-quality hydrocarbon source rocks, determining the structural characteristics of the ancient buried hill existing in the basin at present according to seismic profile structural interpretation results, compiling structural evolution profiles of the basin at different periods to study the evolution history of the ancient buried hill, determining the thickness of the lateral contact layer between the layer position containing the high-quality hydrocarbon source rocks and the ancient buried hill in the depth range of the main hydrocarbon discharge threshold, determining the lateral contact time between the high-quality hydrocarbon source rocks at different layers and the ancient buried hill, establishing the ancient buried probability and optimizing the favorable zones. The evaluation method is characterized in that according to the development characteristics of the ancient buried hill in different structural evolution periods, the effective contact area and the time period of the ancient buried hill and the high-quality hydrocarbon source rock are researched by combining the main hydrocarbon discharge threshold depth of the high-quality hydrocarbon source rock, so that the accumulation probability of the ancient buried hill is evaluated, and the optimum evaluation of the ancient buried hill in the basin is carried out.
Description
Technical Field
The invention belongs to the technical field of research on the established storage evaluation of an ancient buried hill, and particularly relates to an evaluation method of an established storage favorable zone of the ancient buried hill.
Background
The ancient buried hill is a bedrock block with a positive structure on a substrate buried under a new stratum, and undergoes two stages of rising and rising of the crust, denudation and descending of the crust and being buried. At present, the research on the ancient buried hill comprehensively uses multidisciplinary data such as rock core, well logging, earthquake and the like, carries out contrast calibration of single-well conventional well logging and imaging data, identifies the lithology of the ancient buried hill, divides a reservoir into a residual zone, a weathering crust, a fracture zone, an inner curtain oblique crossing high-angle fracture zone and a compact crystallization zone from top to bottom according to the reservoir imaging well logging response characteristic, and mainly describes and predicts a reservoir fracture development area and a fracture development direction. And summarizing the oil-gas accumulation mode of the ancient buried hill by analyzing favorable conditions of oil-gas accumulation of the ancient buried hill such as an oil source, a storage space, a cover layer, oil-gas transportation and the like. The method is characterized in that a lot of researches are carried out on the cause type, evolution and oil and gas transmission and transportation system of the ancient buried hill, and the ancient buried hill is divided into different types. Dividing the oil deposit into a top submerged hill, a slope submerged hill and an inner curtain submerged hill according to the production position of the ancient submerged hill; according to the transportation and conduction conditions formed by the ancient buried hill oil and gas reservoir, the ancient buried hill oil and gas transportation and conduction system is divided into 4 types, namely a fracture type, a non-integration type, an inner curtain corrosion layer type and a composite type transportation and conduction system. According to comprehensive research on characteristics of a fluid pressure field, a fluid chemical field, a fluid migration channel and the like of the ancient buried hill, the ancient buried hill is divided into three types of transportation and convergence dynamics, namely an unconformity communication-open type buried hill (type I), a fault channel-semi-open/semi-closed type buried hill (type II) and a closed type buried hill (type III). The ancient buried hill is controlled by a sunken structure and a basement ancient terrain and is divided into three types of oil gas gathering zones, namely a central bulged type oil gas gathering zone, a broken step type oil gas gathering zone and a slope type oil gas gathering zone.
With the continuous deepening of oil and gas exploration, the exploration thought of the source control theory is subject to more remarkable development and evolution. The hydrocarbon source rock which has a restriction effect on the formation and distribution of the oil-gas reservoir is high-quality hydrocarbon source rock which is not necessarily large in thickness in a hydrocarbon generation recess, but is high in organic matter abundance, good in type and mature. The high-quality hydrocarbon source rock stratum is in direct contact with the ancient buried hill reservoir through fault and unconformity, and oil gas directly enters the ancient buried hill to be buried through the oil supply window. The lower pressure coefficient of the ancient buried hill is the power for transporting and gathering oil and gas to the ancient buried hill. The ancient buried hill elements (raw, storage and cover) are organically unified in space, and the burying functions (circle, transportation and protection) are well matched in time. The formation time of the encirclement of the ancient buried hill is early, the corresponding high-quality hydrocarbon source rock is large in buried depth, rich in organic matter, large in hydrocarbon generation window span, long in hydrocarbon generation and discharge period and high in thermal evolution degree, and an oil-gas source guarantee is provided for the ancient buried hill. Under fault and unconformity surface near source transportation, the oil and gas accumulation elements of the ancient submarine mountains have good configuration relation in time and space. With the development of the oil-gas-containing range and other hiding recognitions of the ancient buried hill controlled by the size of the inner curtain stratum and the oil supply window of the ancient buried hill and the improvement of the secondary three-dimensional seismic acquisition, processing and interpretation integration technology and the ancient buried hill inner curtain accurate imaging technology, the underbalanced drilling, the efficient testing and other technologies, the burying depth is no longer a short plate for restricting the exploration of the ancient buried hill, and the identification of the inner curtain stratum of the ancient buried hill and the prediction of the crack of the reservoir stratum are more accurate.
The patent application with publication number CN104234707A discloses a method for determining the reservoir formation probability of a buried hill oil and gas reservoir, which is used for determining the reservoir formation probability of a research area under the control of single factor of hydrocarbon source rocks according to the oil and gas control characteristics of the hydrocarbon source rocks; determining the oil and gas reservoir probability of the research area under the control of the ancient hump single factor according to the oil and gas control characteristics of the ancient humps; determining the oil-gas reservoir probability of a research area under the control of single factors of a fracture zone according to the oil-gas control characteristics of the fracture zone; determining the oil-gas accumulation probability of the research area under the control of the single factor of the regional cover layer according to the oil-gas control characteristic of the regional cover layer; and determining the reservoir forming probability of the buried hill oil and gas reservoir in the research area according to the oil and gas reservoir forming probability under the control of the four single factors. The prediction method of the buried hill oil and gas reservoir is characterized in that oil and gas reservoir formation probability evaluation is respectively carried out on each single factor, multi-factor dynamic and comprehensive research is not carried out, and effectiveness of the ancient buried hill formation evaluation needs to be verified.
Disclosure of Invention
The invention aims to provide an evaluation method of an ancient buried hill burial favorable zone, so as to solve the problem of poor effectiveness of the existing ancient buried hill burial evaluation method.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
an evaluation method of a favorable zone for the mature zang of an ancient buried hill comprises the following steps:
1) analyzing the lithology characteristics of the stratum, and determining a development zone of the high-quality hydrocarbon source rock in the basin and a stratum layer in the development zone by combining the data statistical result of the actually measured organic carbon content;
2) determining the development zone of the high-quality hydrocarbon source rock in the basin and the main hydrocarbon discharging threshold depth of the stratum layer according to the hydrocarbon generation and discharging characteristics of the high-quality hydrocarbon source rock;
3) analyzing to obtain a regional seismic time profile structure interpretation graph according to seismic profiles, well drilling and well logging data, carrying out time-depth conversion by using a velocity formula to obtain a depth geological profile, and determining the existing ancient buried hill structural characteristics of the basin;
4) determining the structural characteristics of the ancient buried hill existing in the basin at present according to the step 3), and compiling structural evolution profiles of the basin at different periods by utilizing a balance profile recovery principle;
5) according to different periods of the basin, constructing an evolution section, searching a horizon of the ancient buried hill within a depth range of a main hydrocarbon emission threshold of the high-quality hydrocarbon source rock, and determining the thickness of a horizon containing the high-quality hydrocarbon source rock and a horizon in lateral contact with the ancient buried hill; determining the duration of each horizon deposition according to geological age data of stratums in the basin;
6) multiplying the thickness of the layer determined in the step 5) by the duration time of the corresponding layer during deposition to serve as an ancient buried hill burial evaluation parameter; and performing the evaluation of the advantageous zone of the ancient buried hill according to the ancient buried hill forming evaluation parameters.
The invention discloses an evaluation method based on the burial probability of an ancient buried hill, which is used for evaluating the burial probability of the ancient buried hill by researching the effective contact area and the time period of the ancient buried hill and a high-quality hydrocarbon source rock according to different structural evolution periods of the ancient buried hill and combining with the main hydrocarbon discharge threshold depth of the high-quality hydrocarbon source rock, so that the preferred evaluation of the ancient buried hill in a basin is carried out.
Source rocks with organic carbon contents (TOC) of 1.0% or more are generally called high-quality source rocks.
In the step 1), analyzing the formation lithology characteristics of the basin development according to well drilling and logging information and sedimentology information, and determining the development zone of the high-quality hydrocarbon source rock in the basin and the formation layer position in the basin by combining the statistics result of the actual measurement TOC data of the Dongpo pit.
In the step 2), the main hydrocarbon discharging threshold depth of the high-quality source rock refers to that the source rock gradually matures along with the increase of the buried depth and the rise of the temperature, and when the thermal evolution degree of the source rock reaches the maturation stage, a large amount of hydrocarbon discharging occurs. The hydrocarbon-producing properties of classical hydrocarbon source rocks suggest that when 0.7% < Ro < 1.3%, the source rock enters the maturity stage and hydrocarbon expulsion occurs. However, the range of the standard statistic is too wide, and in a specific application process, the depth range determined by only the Ro value is too wide.
For a well-defined high-quality hydrocarbon source rock layer system, samples (the sample density is more than 100m & lt 2 & gt) with different burial depths are continuously collected to carry out rock pyrolysis and analysis on the content of chloroform bitumen A, the relation between three parameters, namely the ratio of the content of soluble hydrocarbon to the content of organic carbon (S1 × 100/TOC), the ratio of the potential hydrocarbon generation to the content of organic carbon ((S1+ S2) × 100/TOC), the ratio of the content of chloroform bitumen A to the content of organic carbon (A% × 100/TOC), and the sample depth corresponding to the maximum value of the three parameters is the main hydrocarbon discharge depth of the high-quality hydrocarbon source rock.
And 3) analyzing according to the seismic data and the drilling logging data to obtain a seismic time section of the basin region, and converting the seismic time section into a depth geological section by using a velocity formula.
And 4) compiling different periods of the construction evolution section of the basin according to the balance section recovery principle. The step is to recover the balanced section according to the deformation time of the unconformity surface and the growing stratum, the line balance of the energy-dry lithology length, the area balance of the section of the weak rock stratum, the strain balance of the fault displacement or shrinkage and the like.
And 6), performing optimized sequencing on the ancient buried mountains in the basin according to the size of the ancient buried mountains accumulation evaluation parameters, and determining favorable zones.
Constructing an evolution section according to different periods, and constructing an evolution section in a depth range of a main hydrocarbon discharge threshold of a high-quality hydrocarbon source rockIn the enclosure, the developed ancient buried mountains are respectively named as a1, a2 and a3 …; respectively counting the thickness (h) of each ancient buried hill in lateral butt joint with a high-quality hydrocarbon source rock stratum at different periods, multiplying the thickness (h) by the duration (t) of stratum deposition at the period, and obtaining the cumulative sum of values (Ma), such as: ma1 ═ h 1 *t 1 +h 2 *t 2 +h 3 *t 3 …；Ma2＝h 1＇ *t 1 +h 2＇ *t 2 +h 3＇ *t 3 …；Ma3＝h 1＇＇ *t 1 +h 2＇＇ *t 2 +h 3＇＇ *t 3 …, respectively; and finally, sequencing according to the Ma value of each ancient buried hill from large to small, wherein the larger the Ma value is, the higher the burial probability of the ancient buried hill is reflected, and determining a favorable zone sequence.
The method for evaluating the ancient buried hill favorable zone can reflect the contact hydrocarbon supply process of the high-quality hydrocarbon source rock and the ancient buried hill during the structural evolution period, has more reliable evaluation effectiveness on the ancient buried hill favorable zone of the basin, and improves the accuracy of the evaluation result.
Drawings
FIG. 1 is a block diagram of a technical scheme of an evaluation method of the present invention;
fig. 2 is a regional seismic time profile interpretation scheme (taking the east-Pu recess large profile 5 as an example);
fig. 3 is an explanatory diagram of a regional depth geological profile (taking the east-Pu concave large profile 5 as an example);
fig. 4 is a prior art cross-section of the eastern Pu' er concave large profile 5;
fig. 5 is a mustard-taste hollow large profile 5 mustard group pre-deposition profile;
fig. 6 is a pre-deposition cross-section of the eastern taste-concave large profile 5;
fig. 7 is a section of the eastern Pu' er concave large profile 5 sand segment before deposition;
FIG. 8 is a cross-section of a pre-deposited on Dongpo-concave large profile 5, Sasa two;
FIG. 9 is a cross-section of the Donpu dimple major profile, 5 Sa Di before deposition;
FIG. 10 is a cross-section of the Donpu dimple profile, 5, sand, top section before deposition;
FIG. 11 is a cross-section of the Donpu dimple profile, 5 sand three mid-section, before deposition;
FIG. 12 is a cross-section of the Donpu dimple major profile, 5, sand three lower segment before deposition;
FIG. 13 is a cross-section of a Donpu dimple profile, 5, sand, four-segment before deposition;
fig. 14 is an ancient buried hill with a donpu-pith large profile 5 now in contact with a premium hydrocarbon source rock;
fig. 15 is a gu-hidden mountain with a east-pu cave large profile 5 brave group with a profile in contact with a premium source rock before deposition;
fig. 16 is an ancient buried hill with an eastern depressed large profile 5 eastern group pre-depositional profile in contact with a premium hydrocarbon source rock;
fig. 17 is an ancient buried hill with a donpu-pith large profile 5 sand section prior to deposition with a profile in contact with a quality hydrocarbon source rock.
Detailed Description
Embodiments of the present invention will be further described with reference to the accompanying drawings.
Examples
Eastone pit is a newly born high frequency shock salted collapsed lake basin that develops on a substrate in the middle and ancient world, and a huge, predominantly ancient-lineage clastic rock formation is deposited during pit formation. The Jurassic and Chalkbrood strata are basically absent in the basin, the ancient system directly covers the middle, lower third of the world and the older strata, and the deposition characteristics reflected by the middle, lower third of the world, upper ancient of the world and the third of the world are similar to those of other areas in North China. The Dongpo cave ancient epoch development series NNE directional forward fault can be divided into blue chat fracture zone, yellow river-West-city-visiting fracture zone and long wall-Shijiaji-Songgui fracture zone on the whole, three ancient buried hill construction zones are formed, and due to the inheritance activity of fracture, the deposition of the sand river street group is controlled, a thick oil-producing layer is deposited in the depression, and favorable conditions for oil storage are provided for the ancient buried hill.
The specific embodiment of the evaluation method of the ancient buried hill successful zone of the invention is shown in a flow chart of figure 1, and comprises the following steps:
1) according to the drilling and logging data and the sedimentology data, the lithology characteristics of the developed formation in the eastern Puke depression basin are analyzed, and the statistical result of the actually measured TOC data of the eastern Puke depression is combined to determine that the high-quality hydrocarbon source rock mainly comprises a sand three-section middle sub-section 5-9 sand group, a sand three-section lower sub-section and a sand four-section upper sub-section at the eastern Puke depression north layer, and mainly comprises a sand three-section lower sub-section and a sand four-section upper sub-section at the south layer.
The distribution of good quality source rock is the widest in the north depressed salt region, and the distribution of good quality source rock is the least in the salt-free region near the north salt lake and in the south freshwater region. Under the control of structural evolution and deposition environment, the development of high-quality source rocks at different layers is slightly different. The high-quality hydrocarbon source rocks of the upper sub-sections of the sand four sections are relatively widely distributed in the salt-free areas at the peripheries of the salt-containing areas and the salt lakes in the north, and the high-quality hydrocarbon source rocks of the fresh water areas in the south are rarely distributed; the distribution of the high-quality hydrocarbon source rocks of the sub-section under the sand three-section is similar to that of the sub-section above the sand four-section, and the distribution of the high-quality hydrocarbon source rocks is also wider in the salt-containing area and the periphery of the salt-containing area in the north part and is reduced compared with that of the sub-section above the sand four-section; compared with the sand four-section upper sublevel and the sand three-section lower sublevel, the deposited high-quality hydrocarbon source rocks of the sand three-section middle sublevel 5-9 sand layer group in the salt-containing region at the north part are relatively less, and the high-quality hydrocarbon source rocks of the south fresh water region and the salt-free region at the north part are distributed lower.
2) Determining the main hydrocarbon discharge threshold depth range of the high-quality hydrocarbon source rock in the development zone of the basin and the stratum layer in which the high-quality hydrocarbon source rock is located within 2750-4250 meters according to the hydrocarbon discharge characteristics of the Donpu depressed high-quality hydrocarbon source rock;
the method comprises the steps of selecting low-maturity 6 hydrocarbon source rock samples with different organic matter abundances formed under three environmental conditions of a salt-containing region in the north part of the east-Pu pit, a salt-free region in the north part and a fresh water region in the south part respectively, and carrying out the east-Pu pit hot-pressing simulation experiment. Two samples with organic carbon contents (TOC) of respectively 4.45% and 3.29% of a Wei 18-5 well and a Wei 146 well are selected in a salt-containing area in the north, and the organic matter type is mainly I type; two organic carbon contents (TOC) of Hu 7-18 wells and bridge 38-6 wells are selected in a salt-free area in the north, wherein the TOC is respectively 2.88 percent and 2.92 percent, and the organic matter types are respectively I type and II 1 type; samples of two wells, namely a spring 9 well and a new 8 well, are selected in the south fresh water area, the organic carbon content (TOC) is 1.05 percent and 0.39 percent respectively, and the organic matter type is II 1 type and III type respectively. The results show that different types of hydrocarbon source rocks begin to generate hydrocarbon at 300 ℃, but the hydrocarbon generation yield is relatively low, with the continuous increase of the simulation temperature, the hydrocarbon generation peak is reached at about 380 ℃, and the maximum hydrocarbon generation yield of the different types of hydrocarbon source rocks shows regular distribution.
The hydrocarbon discharging efficiency of the hydrocarbon source rock is mainly to study the hydrocarbon generation amount and the residual hydrocarbon amount, obtain the size of the hydrocarbon discharging amount through calculation and calculate the hydrocarbon discharging efficiency. The data obtained by the Donpu pit thermal simulation experiment are calculated to obtain the total oil production rate data of the Donpu pit at different temperature stages, and according to the statistical result, under the condition that the hydrocarbon source rock is mature, the data fitting is carried out on the organic carbon content (TOC) and the highest hydrocarbon yield of the unit rock, so as to obtain a data model of the relationship between the maximum hydrocarbon discharge amount of the unit rock and the organic carbon content (TOC): 9.4672 x-3.0197.
For the well-defined high-quality hydrocarbon source rock series, the relation between three parameters, namely the ratio of the content of soluble hydrocarbons to the content of organic carbon (S1 × 100/TOC), the ratio of the potential hydrocarbon generation to the content of organic carbon (S1+ S2) × 100/TOC) and the ratio of the content of chloroform bitumen A' to the content of organic carbon (A% × 100/TOC), and the sample depth range corresponding to the maximum value of the three parameters is 2750-.
3) By using the east Pu' er depressed seismic data, well drilling and well logging data, a seismic interpretation diagram 5 of a basin region seismic large section shown in figure 2 is analyzed, and the section passes through a Thanksger fault, a Pucheng fault, a Wei Dong fault, a Wei-West fault, a Yongcheng fault, a Song temple fault and the like from east to west. The thickness of the ancient and near stratums of the basin is thick east and thin west, the blue chat fault is shovel-type, the whole stratums are east inclined, the development is complete, the ancient system is successively thinned towards west and overthrown, the ancient system is cut under the museum pottery group with an unconformity, and the east camping group with visible residues is overthrown towards west and is on the ancient bulge of the center. Performing time-depth conversion by using a speed formula to obtain a deep geological profile as shown in fig. 3, and determining that the ancient buried hill existing in the basin at present comprises a Longgu 3 bottom ancient buried hill, a Guangxi 5 bottom ancient buried hill, a Wei 17 bottom ancient buried hill, a Ming 209 bottom ancient buried hill and a Yun 12 bottom ancient buried hill which are of a broken back inclined structure;
4) taking the large section 5 as an example, according to a depth geological section obtained by time-depth conversion, compiling basin different-period structure evolution sections (shown in figures 4-13) of the overlarge section 5 by using a balance section recovery principle, wherein the ancient buried hill does not develop as can be seen in the section before sand four-section deposition; the section before deposition of the sublevel under the three sections of sand shows that the ancient buried hill at the bottom of the Longgu 3 begins to form due to the activity of the lanchat fault; the section before deposition of the sub-section on the sand three sections shows that the ancient buried hill at the bottom of cloud 12, the ancient buried hill at the bottom of wei 17 and the ancient buried hill at the bottom of Ming 209 are formed due to the strong activities of the Pucheng fault, the Weidong fault, the Weixi fault and the Guancheng fault; as can be seen from the section before deposition of the inferior subsection of the sand two-section, the ancient buried hill formed in the early stage is inheritably developed because the ancient buried hill at the bottom of 5 west parts is formed by the fault activity of the Song temple. After the sand second-stage deposition period, the activities of the second-stage fault and the third-stage fault of the ancient buried hill are controlled to be weakened, and the shallow fourth-stage and fifth-stage secondary faults are greatly developed, but the transformation effect on the early-formed ancient buried hill is small.
5) Taking the large section 5 as an example, according to the structural evolution sections of the east Pu depressed basin at different periods, searching the ancient buried hill with the main hydrocarbon discharge threshold depth being in the range of 2750-4250 meters and contacting with the layer position of the high-quality hydrocarbon source rock (the sand three-section middle sub-section 5-9 sand group, the sand three-section lower sub-section and the sand four-section upper sub-section), and calculating the layer position thickness of the high-quality hydrocarbon source rock and the ancient buried hill at each period within the lateral contact range (as shown in fig. 14-17): the large section 5. the ancient buried hill at the bottom of the upper guard 17 of the current section is 5 to 9 of sand three, sand three lower, sand four upper, and middle life, and the contact thickness of the stone charcoal-binary system is about 1000 m; the thickness of the ancient buried hill at the bottom of the cloud 12 on the section of the large-section 5-Librarian pottery group before deposition is about 700m, the thickness of the ancient buried hill at the top of the Sand III and the stone charcoal-secondary system contact is about 700m, the thickness of the ancient buried hill at the bottom of the Longgu 3 is about 5-9 of the Sanzhong, the thickness of the Sanxian and the thickness of the ancient buried hill at the top of the sand IV and the front frid force system contact is about 1100 m; the thickness of the ancient buried hill at the bottom of the cloud 12 on the section of the large-section 5 Dongying group before deposition is about 200m when the three-lower part of sand is in contact with the stone charcoal-secondary system, and the thickness of the ancient buried hill at the bottom of the Longgu 3 is about 400m when the three-lower part of sand is in contact with the four-upper part of sand and the front frigid system; in the deposition period above and before the sand II, the burial depth is within the range of 2750-4250 meters, and hydrocarbon source rocks below the sand III and above the sand IV are not contacted with the ancient buried hill;
6) calculating the duration of each horizon deposition according to geological age data of stratums in the basin, wherein the duration is specifically shown in a table 1;
TABLE 1 geological ages of the Donpu concave palygorskite segments
7) Multiplying the thickness of the layer in contact with the ancient buried hill of the source rock in each period determined in the step 5) by the duration of the corresponding layer during deposition, and taking the obtained value as an ancient buried hill burial evaluation parameter: in the ancient buried hill at the bottom of the satellite 17 in the Librarian pottery group-to-date, the sum of the product of the contact thickness and the duration is 17000; the sum of the product of the contact thickness and the duration of the ancient buried hill at the bottom of the cloud 12 in the period of the eastern camps is 11200; in the period of the ancient buried hill at the bottom of the Longgu 3 in the Dongying group, the sum of the product of the contact thickness and the duration is 17600; the product sum of the contact thickness and the duration of the ancient buried hill at the bottom of the cloud 12 in the sand period is 400; in the sand period of the ancient buried hill at the bottom of the Longgu 3, the sum of the product of the contact thickness and the duration is 800;
8) and sequencing according to the descending of the burial evaluation parameters of each ancient buried hill, wherein the larger the value is, the higher the burial probability of the ancient buried hill is reflected, the preferred sequencing of the ancient buried hill in the basin is carried out, and finally, the favorable zone is selected.
In step 8), the obtained pairs of taste-depressed gushseng mountain preservation evaluation parameters are shown in table 2.
TABLE 2 comparison of taste buried evaluation parameters
Constructing evolution sections according to different periods, searching developed ancient buried mountains (table 2) within the range of 2750-4250 meters of main hydrocarbon discharge threshold depth of high-quality hydrocarbon source rock, respectively counting the thickness of each ancient buried mountain in lateral butt joint with a high-quality hydrocarbon source rock stratum at different periods, multiplying the thickness by the deposition duration of the stratum at the period, accumulating the obtained values to serve as the ancient buried mountain burial evaluation parameters, finally sequencing the ancient buried mountains from large to small according to the parameter values of each ancient buried mountain, and determining that the favorable zone sequence sequentially comprises the following steps: dong 1 bottom ancient buried hill (31400), hu 59 bottom ancient buried hill (30000), first 1 bottom ancient buried hill (25150), Wen 250 bottom ancient buried hill (23300), Longgu 3 bottom ancient buried hill (18400), Wei 17 bottom ancient buried hill (17000), Laoyu ancient buried hill (16400), cloud 12 bottom ancient buried hill (11600).
Claims (4)
1. An evaluation method of a zone of interest in the mature zang of an ancient buried hill is characterized by comprising the following steps:
1) analyzing the lithology characteristics of the stratum, and determining a development zone of the high-quality hydrocarbon source rock in the basin and a stratum layer in the development zone by combining the data statistical result of the actually measured organic carbon content;
2) determining the development zone of the high-quality hydrocarbon source rock in the basin and the main hydrocarbon discharging threshold depth of the stratum layer according to the hydrocarbon generation and discharging characteristics of the high-quality hydrocarbon source rock;
3) analyzing to obtain a regional seismic time profile structure interpretation graph according to seismic profiles, well drilling and well logging data, carrying out time-depth conversion by using a velocity formula to obtain a depth geological profile, and determining the existing ancient buried hill structural characteristics of the basin;
4) determining the structural characteristics of the ancient buried hill existing in the basin at present according to the step 3), and compiling structural evolution profiles of the basin at different periods by utilizing a balance profile recovery principle;
5) constructing an evolution profile according to different periods of the basin, searching the horizon of the ancient buried hill in the depth range of the main hydrocarbon drainage threshold of the high-quality source rock, and determining the thickness of the horizon containing the high-quality source rock and the lateral contact horizon of the ancient buried hill; determining the duration of each horizon deposition according to geological age data of stratums in the basin;
6) multiplying the thickness of the layer determined in the step 5) by the duration time of the corresponding layer during deposition to serve as an ancient buried hill burial evaluation parameter; and (4) performing the beneficial zone evaluation of the ancient buried hill according to the ancient buried hill burial evaluation parameters.
2. The method for evaluating the burial interest zone of the ancient buried hill according to claim 1, wherein the analyzing the lithology characteristics of the stratum in step 1) is to analyze the lithology characteristics of the stratum in the basin development according to the well logging data and the sedimentology data.
3. The method for evaluating the old buried hill burial favorable zone as claimed in claim 1, wherein in the step 1), the step of determining the development zone and the stratum level of the high-quality source rock in the basin is based on the statistical result of the lithology characteristics of the stratum combined with the actually measured organic carbon content data.
4. The method for evaluating an ancient buried hill burial favorable zone as claimed in claim 1, wherein in the step 6), the ancient buried hills in the basin are sorted according to the size of the ancient buried hill burial evaluation parameter to determine the favorable zone.
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