CN106909717B - Method for determining main oil production layer of lake-phase low-abundance and multi-production-layer compact oil field - Google Patents
Method for determining main oil production layer of lake-phase low-abundance and multi-production-layer compact oil field Download PDFInfo
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Abstract
The invention provides a method for determining a main oil-producing layer of a lake-phase low-abundance and multi-producing-layer compact oil field, which comprises the following steps: obtaining core test results of each layer of a typical lake-facies low-abundance tight oil field of a multi-producing zone, well drilling oil gas display data, single well logging interpretation results of all single wells, single well test yield and single well oil extraction accumulated yield; determining a selection standard of the high-yield and stable-yield well according to the acquired data, and selecting the high-yield and stable-yield well in all the single wells; judging the development interval and display grade of the reservoir where the high-yield and stable-yield well is located, the reservoir physical property, oil content and crack development degree of the development interval of the reservoir where the high-yield and stable-yield well is located, and the source storage configuration relation of the reservoir where the high-yield and stable-yield well is located; and determining a main oil production layer according to the judgment indexes and the corresponding preset weight coefficients. The method provided by the invention can determine the main oil producing layer of the lake-facies low-abundance and multi-zone compact oil field, and reduce the exploration and development cost and the development risk.
Description
Technical Field
The invention relates to the technical field of oil and gas exploitation, in particular to a method for determining a main oil production layer of a lake-phase low-abundance and multi-production-layer compact oil field.
Background
With the deepening, hiding and complication of conventional oil reservoir exploration and development objects, the stable yield and the increasing difficulty of crude oil production are to be realized. With the deepening and innovation of geological theoretical understanding and the continuous progress of process technology, dense oil with rich resources and large reserves is becoming a new field of petroleum exploration. The compact oil resource of the large Anzhai section of the Jurassic lake in the Sichuan basin accounts for more than 60 percent of the compact oil resource of the basin, and the oil layers in the longitudinal direction are longitudinal and numerous and dispersed. The tight oil has the characteristics of poor reservoir porosity, extremely low permeability, fine pore throat, strong non-mean property and the like, so that the fluid seepage resistance is large, and the flow is difficult in the production process. The exploration and development practice of compact oil at home and abroad shows that the effective development technology of compact oil fields is to adopt the volume fracturing technology of horizontal wells for transformation and production. Therefore, for compact oil fields with low abundance and multiple producing zones in lake facies, main force producing wells need to be determined to reduce the cost of exploration and development and the risk of development.
At present, a determination method suitable for a lake-phase low-abundance and multi-pay zone tight oil field main-force pay zone is not established, and the exploration and development cost and the development risk are higher during the development of the tight oil field.
Disclosure of Invention
In view of the above, the invention provides a method for determining a main power oil production layer of a lake-facies low-abundance and multi-pay-zone tight oil field, which can determine the main power oil production layer of the lake-facies low-abundance and multi-pay-zone tight oil well, thereby reducing exploration and development cost and development risk.
Specifically, the method comprises the following technical scheme:
the invention provides a method for determining a main oil-producing layer of a lake-phase low-abundance and multi-producing-layer compact oil field, which comprises the following steps:
obtaining typical lake facies low abundance, test results of rock cores of all layers of the tight oil fields of the multi-producing zone, well drilling oil gas display data, single well logging interpretation results, single well test yield and single well oil extraction accumulated yield of all single wells of the tight oil fields of the multi-producing zone;
determining the selection standard of a high-yield and stable-yield well according to the single-well test yield and the single-well oil extraction accumulated yield of all single wells of the typical lake-facies low-abundance and multi-producing-layer compact oil field;
determining high-yield stable-production wells in all single wells of the typical lake-facies low-abundance tight oil field with multiple producing zones according to the selection standard of the high-yield stable-production wells;
judging the development layer section and the display level of the reservoir where the high-yield and stable-yield well is located according to the drilling oil gas display data of the high-yield and stable-yield well;
determining the physical property, the oil content and the fracture development degree of a development layer section of a reservoir where the high-yield and stable-yield well is located according to the single-well logging interpretation result of the high-yield and stable-yield well;
obtaining a source storage configuration relation of a reservoir where the high and stable yield wells are located according to the single well logging interpretation result of the high and stable yield wells;
and determining a main oil production layer according to the development interval and the display grade of the reservoir where the high-yield and stable-yield well is located, the reservoir physical property, the oil content and the crack development degree of the development interval where the high-yield and stable-yield well is located, the source storage configuration relation of the high-yield and stable-yield well, the core test result of each layer and a corresponding preset weight coefficient.
Optionally, the determining a selection criterion of a high-yield and stable-yield well according to the single-well test yield and the single-well oil production accumulated yield of all the single wells of the typical lake-facies low-abundance and multi-zone tight oil field comprises:
and fitting to obtain a regression curve of the test yield and the accumulated yield according to the single-well test yield and the single-well accumulated yield of all the single wells of the typical lake-facies low-abundance and multi-zone compact oil field, and determining the selection standard of the high-yield and stable-yield wells according to a preset accumulated yield value and a test yield value of the preset accumulated yield value on the regression curve of the test yield and the accumulated yield.
Optionally, the selection criteria of the high and stable yield well are: and the single-well accumulated yield value is greater than the preset accumulated yield value, and the single-well test yield value is greater than the test yield value corresponding to the preset accumulated yield value on the regression curve of the test yield and the accumulated yield.
Optionally, the developmental interval comprises a sub-segment, a lamina.
Optionally, the display levels include gas sensing anomalies, gas flooding, oil immersion, well kick, and lost circulation.
Optionally, the determining a dominant pay zone according to the development interval and the display grade of the reservoir where the high and stable yield wells are located, the reservoir physical property, the oil content and the fracture development degree of the development interval of the reservoir where the high and stable yield wells are located, the source storage configuration relationship of the high and stable yield wells, the core test results of each layer, and the corresponding preset weight coefficients includes:
and obtaining a comprehensive numerical value of each development interval of the high-yield and stable-yield well according to the development interval of the reservoir of the high-yield and stable-yield well and a first numerical value corresponding to a display grade, the reservoir physical property, the oil content and the crack development degree of the development interval of the high-yield and stable-yield well, a third numerical value corresponding to the source storage configuration relation of the high-yield and stable-yield well, a fourth numerical value corresponding to the test result of each layer of rock core and a corresponding preset weight coefficient, so as to determine a main oil production layer.
Optionally, the core test results of each layer include core observation description records, core physical property data, slice identification data, lithology analysis data, X-ray diffraction analysis data and mercury intrusion parameter data.
Optionally, the obtaining a source-reservoir configuration relationship of a reservoir where the high-yield and stable-yield well is located according to the single-well logging interpretation result of the high-yield and stable-yield well includes:
and analyzing the configuration relationship between the hydrocarbon source rock parameters and the reservoir parameters according to the single well logging interpretation result of the high-yield and stable-yield well to obtain the source reservoir configuration relationship of the reservoir where the high-yield and stable-yield well is located.
The technical scheme provided by the embodiment of the invention has the beneficial effects that:
the invention provides a method for determining a main productivity oil layer of a lake-facies low-abundance and multi-production-layer compact oil field, which comprises the steps of selecting all high-yield and stable-production wells of the lake-facies low-abundance and multi-production-layer compact oil field according to the test results of cores of all layers of a typical lake-facies low-abundance and multi-production-layer compact oil field, the display data of drilling oil gas, the interpretation results of single well logging of all single wells of the multi-production-layer compact oil field, the test yield of the single well and the accumulated yield of single well oil extraction, determining the development interval and the display level of the reservoir where the high-yield and stable-production wells are located, determining the reservoir physical property, the oil content and the crack development degree of the reservoir where the high-yield and stable-production wells are located, and further determining the main productivity oil layer of the lake-facies low-abundance and multi-production-layer compact oil field, thereby reducing the exploration and development.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a method for determining a main pay zone of a lake-facies low-abundance, multi-pay zone tight oilfield in an embodiment of the present invention;
FIG. 2 is a histogram of comprehensive information of a reservoir at section A of an X field in an embodiment of the invention;
FIG. 3 is a regression curve of the measured production versus the cumulative production for the reservoir at section A of the X field in one embodiment of the present invention;
FIG. 4 is a comparison graph of well logging interpretation results of 9 high and stable yield wells of a reservoir at section A of an X oil field in accordance with an embodiment of the present invention;
fig. 5 is a source-reservoir configuration diagram of a single well of 9 high-yield and stable-yield wells in the longitudinal direction of the reservoir at the section a of the X oilfield in an embodiment of the invention.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the following will describe embodiments of the present invention in further detail with reference to the accompanying drawings.
An embodiment of the invention provides a method for determining a main pay zone of a lake-facies low-abundance and multi-pay zone tight oilfield, which comprises the steps of S101, S102, S103, S104, S105, S106 and S107 as shown in FIG. 1.
Step S101: and obtaining the test results of cores of all layers of the typical lake facies low-abundance tight oil fields of the multi-producing zone, well drilling oil gas display data, the typical lake facies low-abundance tight oil fields of the multi-producing zone, the single well logging interpretation results of all single wells of the single well tight oil fields of the multi-producing zone, the single well test yield and the single well oil extraction accumulated yield.
In the step, the test results of each layer of rock core comprise rock core observation description records, rock core physical property data, slice identification data, lithology analysis data, X-ray diffraction analysis data and mercury intrusion parameter data.
The stratum thickness of the compact oil field at the section A of the X oil field is 70-90m, the buried depth is 2400-2500m, the lithology group of the compact oil field at the section A of the X oil field shows the deposition characteristics of a set of shallow-semi-deep lake phase black shale and biological limestone interbedded layers, the hydrocarbon source rock mainly develops in semi-deep lake mud at the large third section, the reservoir mainly develops in mesochite at the large first section and the large third section, the thickness of the mesochite is 5-20m, the porosity of a reservoir matrix rock is generally less than 2%, and the permeability is generally less than 0.1 × 10-4μm2Individually greater than 1 × 10-3μm2And a plurality of cracks exist, and generally, the reservoir stratum at the section A of the X oil field is a lake-phase ultra-low pore and seepage reservoir stratum. As shown in fig. 2, it is a bar chart of comprehensive information of the oil layer of the section a of the X oil field.
Step S102: and determining the selection standard of the high-yield and stable-yield well according to the single-well test yield and the single-well oil extraction accumulated yield of all single wells of the typical lake-phase low-abundance and multi-production-zone compact oil field.
In the step, a regression curve of the tested yield and the accumulated yield is obtained by fitting according to the single-well tested yield and the single-well accumulated yield of all single wells of the typical lake-phase low-abundance and multi-zone compact oil field, and the selection standard of the high-yield and stable-yield well is determined according to the preset accumulated yield value and the corresponding tested yield value of the preset accumulated yield value on the regression curve of the tested yield and the accumulated yield: the single well accumulated yield value is larger than the preset accumulated yield value, and the single well test yield value is larger than the test yield value corresponding to the preset accumulated yield value on the regression curve of the test yield and the accumulated yield.
Specifically, the preset cumulative output may be set to 1 ten thousand tons.
As shown in fig. 3, the regression curve of the test yield and the cumulative yield of the reservoir in the a-stage of the X oil field is shown, and when the test yield corresponding to the cumulative yield of 1 ten thousand tons on the curve is 8 tons/day, the selection standard of the high-yield and stable-yield well can be determined to be that the test yield is greater than 8 tons/day and the cumulative yield is greater than 1 ten thousand tons.
Step S103: and determining the high-yield stable-production wells in all the single wells of the typical lake-facies low-abundance and multi-producing-layer compact oil field according to the selection standard of the high-yield stable-production wells.
And selecting nine high-yield and stable-production wells of 11, 17, 26, 47, 35, 57, 003-1, 026-1 and 108X from the reservoir stratum at the section A of the X oil field according to the selection standard of the high-yield and stable-production wells.
Step S104: and judging the development layer section and the display level of the reservoir where the high-yield and stable-yield well is located according to the drilling oil gas display data of the high-yield and stable-yield well.
In this step, the display levels include gas sensing anomalies, gas immersion, oil immersion, kick and lost circulation, and the developmental interval includes sub-segments, small layers.
The well drilling display data of 9 high-yield and stable-yield wells of the reservoir in the section A of the X oil field are shown in the following table:
it can be seen that the display interval of the 9 high-yield and stable-yield well is mainly distributed in the major third-subsection mesochite, and the display level is higher and is mainly air-immersed and above.
Step S105: and determining the physical property, the oil content and the crack development degree of a reservoir stratum of a development interval where the high-yield and stable-yield well is located according to the single-well logging interpretation result of the high-yield and stable-yield well.
According to the well logging interpretation results of 9 high-yield and stable-yield wells of the reservoir stratum at the section A of the X oil field, the porosity, the permeability, the oil saturation and the fracture development index of the reservoir stratum are respectively counted according to the sub-section or the small layer, and as shown in fig. 4, the well logging interpretation results are a comparison graph of the well logging interpretation results of the 9 high-yield and stable-yield wells of the reservoir stratum at the section A of the X oil field. Comprehensive analysis shows that the physical properties of the reservoir in the large three sections are relatively high, and the development degree of the crack is high.
Step S106: and obtaining the source storage configuration relation of the high and stable yield well according to the single well logging interpretation result of the high and stable yield well.
According to the well logging interpretation data of 9 high-yield and stable-yield oil wells in the reservoir stratum of the section A of the X oil field, a single-well source-reservoir configuration relation diagram of 9 high-yield and stable-yield oil wells in the longitudinal direction is established, and is shown in figure 5. And analyzing the configuration relationship between the hydrocarbon source rock parameters (organic carbon content and hydrocarbon source rock thickness) and the reservoir parameters (reservoir porosity, reservoir permeability and fracture development index) to respectively obtain the source reservoir configuration relationship of 9 high-yield and stable-yield oil wells, analyzing the source reservoir configuration relationship by combining the accumulated oil yield to determine the most favorable source reservoir configuration relationship, and further determining that the main oil production layer in the longitudinal direction is a major sub-section.
Step S107: and determining a main oil production layer according to the development interval and the display grade of the reservoir where the high-yield and stable-yield well is located, the reservoir physical property, the oil content and the crack development degree of the interval of the reservoir where the high-yield and stable-yield well is located, the source storage configuration relation of the high-yield and stable-yield well, the core test result of each layer and the corresponding preset weight coefficient.
Specifically, a comprehensive numerical value of each interval of the reservoir where the high-yield and stable-yield well is located is obtained according to a first numerical value corresponding to a development interval and a display level of the reservoir where the high-yield and stable-yield well is located, reservoir physical properties of the interval of the reservoir where the high-yield and stable-yield well is located, a second numerical value corresponding to oil-bearing property and crack development degree, a third numerical value corresponding to a source storage configuration relation of the high-yield and stable-yield well, a fourth numerical value corresponding to a test result of each layer of a core and a corresponding preset weight coefficient, and therefore a main force oil-producing layer is determined.
In the step, the development interval and the display grade of the reservoir where the high-yield and stable-yield well is located, the reservoir physical property, the oil content and the crack development degree of the development interval of the reservoir where the high-yield and stable-yield well is located, the source storage configuration relation of the high-yield and stable-yield well and the test result of each layer of rock core can be respectively scored according to experience, so that a score corresponding to each index of each reservoir is obtained, the score of each reservoir is obtained according to the weight coefficient corresponding to each index, and then the main force oil production layer is determined.
In this step, the weight coefficients corresponding to the four indexes, namely the development interval and the display level of the reservoir where the high and stable yield wells are located, the reservoir physical property, the oil content and the crack development degree of the development interval of the reservoir where the high and stable yield wells are located, the source storage configuration relation of the high and stable yield wells and the core test results of each layer, may be 0.2, and 0.4, but the present invention is not limited thereto, and the weight coefficients of the four indexes may be determined according to actual conditions.
And finally determining that the main oil producing layer of the reservoir at the section A of the X oil field is a major three-section reservoir.
According to the determination method for the main force oil production layer of the lake-facies low-abundance and multi-producing-layer compact oil field, all high-yield and stable-production wells of the lake-facies low-abundance and multi-producing-layer compact oil field are selected according to the typical lake-facies low-abundance and multi-producing-layer compact oil field layer core test results, the drilling oil and gas display data, the typical lake-facies low-abundance and single-well logging interpretation results of all single wells of the multi-producing-layer compact oil field, the single-well test yield and the single-well oil production cumulative yield, and the development intervals and the display levels of the lake-facies low-abundance and multi-producing-layer compact oil field, the development physical properties, the oil content and the crack development degree of the reservoir of the high-yield and stable-production well, and the source storage configuration relation of the high-yield and stable-production well, so that the main force oil production layer of the lake-facies low-.
The above description is only for facilitating the understanding of the technical solutions of the present invention by those skilled in the art, and is not intended to limit the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A method for determining a dominant pay zone of a lake-phase low-abundance and multi-pay zone tight oil field is used for a Jurassic lake-phase great Ansai section in the Sichuan basin, and the lake-phase low-abundance and multi-pay zone tight oil field has poor reservoir porosity, extremely low permeability, fine pore throat and strong non-mean value and comprises the following steps:
obtaining typical lake facies low abundance, test results of rock cores of all layers of the tight oil fields of the multi-producing zone, well drilling oil gas display data, single well logging interpretation results, single well test yield and single well oil extraction accumulated yield of all single wells of the tight oil fields of the multi-producing zone;
determining the selection standard of a high-yield and stable-yield well according to the single-well test yield and the single-well oil extraction accumulated yield of all single wells of the typical lake-facies low-abundance and multi-producing-layer compact oil field;
determining high-yield stable-production wells in all single wells of the typical lake-facies low-abundance tight oil field with multiple producing zones according to the selection standard of the high-yield stable-production wells;
judging the development layer section and the display level of the reservoir where the high-yield and stable-yield well is located according to the drilling oil gas display data of the high-yield and stable-yield well;
determining the physical property, the oil content and the fracture development degree of a development layer section of a reservoir where the high-yield and stable-yield well is located according to the single-well logging interpretation result of the high-yield and stable-yield well;
establishing a source storage configuration relationship of a plurality of high-yield and stable-yield oil wells in the longitudinal direction according to the single-well logging interpretation result of the high-yield and stable-yield well, and analyzing the configuration relationship of the hydrocarbon source rock parameters and the reservoir parameters to obtain the source storage configuration relationship of the reservoir where the high-yield and stable-yield well is located;
and obtaining a comprehensive numerical value of each development interval of the high-yield and stable-yield well according to the development interval of the reservoir of the high-yield and stable-yield well and a first numerical value corresponding to a display grade, the reservoir physical property, the oil content and the crack development degree of the development interval of the high-yield and stable-yield well, a third numerical value corresponding to the source storage configuration relation of the high-yield and stable-yield well, a fourth numerical value corresponding to the test result of each layer of rock core and a corresponding preset weight coefficient, so as to determine a main oil production layer.
2. The method for determining the dominant pay zone of the lake facies low abundance, tight oilfield in the multi-pay zone according to claim 1, wherein the selection criteria for determining the high and stable yield wells according to the single well test yield and the single well oil production cumulative yield of all the single wells in the typical lake facies low abundance, tight oilfield in the multi-pay zone comprise:
and fitting to obtain a regression curve of the test yield and the accumulated yield according to the single-well test yield and the single-well accumulated yield of all the single wells of the typical lake-facies low-abundance and multi-zone compact oil field, and determining the selection standard of the high-yield and stable-yield wells according to a preset accumulated yield value and a test yield value of the preset accumulated yield value on the regression curve of the test yield and the accumulated yield.
3. The method for determining the dominant pay zone of the lake-facies low-abundance, tight oilfield of the multi-pay zone as defined in claim 2, wherein the selection criteria of the high-yield and stable-production well are as follows: and the single-well accumulated yield value is greater than the preset accumulated yield value, and the single-well test yield value is greater than the test yield value corresponding to the preset accumulated yield value on the regression curve of the test yield and the accumulated yield.
4. The method for determining the dominant pay zone of a lake-facies low-abundance, multi-pay tight oilfield according to claim 1, wherein the developmental interval comprises sub-segments and small layers.
5. The method for determining the dominant pay zone of a lake-facies low-abundance, multi-pay tight oilfield according to claim 1, wherein the display levels include gas logging anomalies, gas flooding, oil flooding, well kick and lost circulation.
6. The method for determining the dominant pay zone of the lake-facies low-abundance, tight oilfield in the multi-pay zone as defined in claim 1, wherein the test results of the cores in each layer include core observation description records, core physical property data, slice identification data, lithology analysis data, X-ray diffraction analysis data and mercury intrusion parameter data.
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