Method and device for calculating shell source helium source proportion

Abstract

The invention relates to the technical field of oil and gas associated helium exploration, in particular to a method and device for calculating the source proportion of shell source helium. After the helium in the gas reservoir is determined to be from the mixture of the reservoir stratum and the hydrocarbon source rock stratum, firstly, the gas reservoir range and the hydrocarbon source range are determined, and the helium source range of the two stratums contributing to the helium in the gas reservoir is roughly delineated; and secondly, an innovative method is adopted, the mixing proportion of helium coming from the two sets of helium source rocks is quantitatively calculated, and qualitative analysis of the source of the shell source helium is changed into quantitative calculation. According to the quantitative calculation method, the specific gas reservoir range and the hydrocarbon source range are considered, the calculation result is more accurate and reasonable, the specific mixing proportion of the helium from the gas reservoir and the strata system where the hydrocarbon source rock is located can be quantitatively calculated, and analysis of the helium source of the shell source is changed from qualitative analysis to quantitative calculation.

Description

Technical Field

[0001] The present disclosure relates to the technical field of oil and gas associated helium exploration, and in particular to a method and device for calculating the source ratio of shell-derived helium. Background Art

[0002] Helium can be divided into three sources: atmospheric source, crust source and mantle source. 3 He mainly comes from mantle degassing, and 4 He is mainly derived from the decay of radioactive elements. 3 He / 4 What order of magnitude is the He ratio, or the sample's 3 He / 4 He(R) and atmospheric 3 He / 4 The crustal or mantle origin of helium can be determined by the ratio of He to Ra (R / Ra) (Xu Yongchang et al., 1996). However, the precise source of crustal helium, from which strata or strata, remains a matter of qualitative analysis. For example, water-soluble helium in the Weihe Basin originates primarily from Qinling granites; helium on the northern margin of the Qaidam Basin originates primarily from U- and Th-rich granites in the basement; helium in eastern Chongqing originates primarily from the Wufeng-Longmaxi Formations; helium in Fuling shale gas originates primarily from the Longmaxi Formation; helium in the Dongsheng gas field in the Ordos Basin originates primarily from basement granites; helium in tight sandstone gas in the Ordos Basin originates primarily from the basement; and helium in the Tarim Basin originates primarily from Permian igneous rocks. Currently, no published reports have quantitatively calculated the detailed proportions of helium's mixed sources.

[0003] In addition, the following technologies have been proposed in the existing methods for the specific sources of shell helium:

[0004] Document No. CN115356463 ​​A discloses a method for determining whether basement granite contributes helium to a helium-rich natural gas reservoir, comprising: collecting representative reservoir rock, underlying sedimentary layer, and helium-rich natural gas samples in a study area basin; measuring the helium generation amount of the reservoir rock and underlying sedimentary layer; measuring the average helium concentration in the helium-rich natural gas sample to obtain the helium content in the helium-rich natural gas reservoir; and comparing the helium generation amount of the reservoir rock and underlying sedimentary layer with the helium content in the helium-rich natural gas reservoir to determine whether the basement granite contributes to the helium source of the helium-rich natural gas reservoir: 1) If 4 He 生 ≥ 4 He 藏 , indicating that the basement granite has a limited contribution to the helium source of the helium-rich natural gas reservoir; 2) if 4 He 生 < 4 He 藏 This indicates that the basement granite contributes significantly to the helium source of helium-rich natural gas reservoirs.

[0005] Document No. CN116071191 A discloses a method for quantitatively characterizing the contribution of helium source rocks in a helium-rich gas field in a stable craton basin, comprising: obtaining a stable craton basin helium-rich gas field whose contribution is to be quantitatively characterized as a first natural gas field, collecting natural gas samples, and obtaining the helium content and the average helium content in the natural gas samples from different zones; calculating the helium geological reserves of each zone to obtain the total helium resources of the first natural gas field; obtaining the uranium and thorium element concentrations of rocks in the sedimentary helium source rock layer; calculating the helium release yield of each sub-layer; and obtaining the helium contribution of the sedimentary helium source rock layer and basement granite in the first natural gas field.

[0006] Both of the aforementioned papers assess the contribution of the basement and sedimentary caprocks to the accumulated helium from the perspective of helium generation and release from various source rock systems. The first paper makes a qualitative assessment, while the second achieves quantitative calculations. However, both ignore the fact that not all helium released by source rocks throughout the basin will form reservoirs. Therefore, their calculation methods are inherently flawed, and their results are subject to ambiguity. Summary of the Invention

[0007] In response to the above problems, the present disclosure provides a method and apparatus for calculating the source ratio of shell-derived helium, which are used to solve the problem of inaccurate sources of shell-derived helium in the prior art.

[0008] In a first aspect, the present disclosure provides a method for calculating the proportion of shell-derived helium, the method comprising:

[0009] Determine the extent of the gas reservoir and / or gas field to be calculated;

[0010] Determine the source rock series of the natural gas reservoir and determine the scope of the source kitchen;

[0011] Based on the range of the source kitchen, calculate the helium generation intensity Es of the source rock of each well during the main hydrocarbon expulsion period, and calculate the helium generation amount Gs of the source rock in the source kitchen during the main hydrocarbon expulsion period;

[0012] Calculate the helium generation intensity Er of the stratum where the reservoir is located in each well according to the scope of the gas reservoir and / or gas field, and calculate the helium generation Gr of the stratum where the reservoir is located within the scope of the gas reservoir and / or gas field;

[0013] Calculate the mixing ratio of helium from the source rock and the reservoir formation in the gas reservoir, R = Gs / Gr.

[0014] Furthermore, the scope of the gas reservoir and / or gas field to be calculated is determined, including:

[0015] Generally, all current oil and gas wells are included. The boundaries of oil and gas wells can be the boundaries of 3D seismic blocks, boundaries of major structural units, major faults or outer envelopes of reserve calculation units.

[0016] Specifically, the term "generally" refers to the specific content of the gas reservoir / field boundary. This refers to the general principle for determining the boundaries of a gas reservoir / field, generally including all oil and gas fields. This implies that individual wells may be excluded under special circumstances. The term "generally" here is not to be understood as vague, but rather as a general principle. Within this principle, the specific boundaries are determined by the second half of the sentence. Once the specific boundaries are determined, a very small number of wells may be excluded, but this does not affect the overall principle.

[0017] Furthermore, the source rock series of the natural gas reservoir and the scope of the source kitchen are determined, including:

[0018] Source rock evaluation and oil and gas source correlation are used to determine the source rock strata of natural gas reservoirs and / or gas fields, and the scope of the source kitchen is delineated based on the planar distribution of TOC of the source rock, the thermal evolution of the source rock, the hydrocarbon generation intensity of the source rock and the vertical oil and gas transmission pathways.

[0019] Furthermore, the helium gas generation intensity Es of each well's source rock during the main hydrocarbon expulsion period is calculated, including:

[0020] Calculate the average value of uranium equivalent content Ues of the source rock layers of each well Average value of source rock formation density and the thickness of the source rock formation Hs;

[0021] Among them, Ues is calculated based on the single well energy spectrum logging data, and the formula is as follows:

[0022] Ues=Us+Ths / C;

[0023] Where: Ues is the uranium equivalent content of the source rock calculated based on the helium generation capacity, 10 -6 ; Us is the uranium content of the source rock formation energy spectrum logging, 10 -6 ; Ths is the thorium content of the source rock formation spectrum logging, 10 -6 ; C is the conversion factor, dimensionless;

[0024] Determine the cumulative time Ts of the main hydrocarbon expulsion time of the source rock, where Ts is the sum of the main accumulation periods of the target gas reservoir and / or gas field: Ts = ∑Ts i , (i=1,2,...,n), Ts i is the duration of the i-th single hydrocarbon expulsion, n is the number of hydrocarbon expulsions from the source rock; Ts i and n are determined comprehensively through the thermal evolution history of the source rock, gas reservoir inclusion analysis, inclusion homogenization temperature test and capture pressure test results, and host mineral dating results;

[0025] According to the average value of uranium equivalent content Ues of source rocks Average density of source rock formations The helium generation intensity Es of the source rock layer is calculated based on the source rock thickness Hs and the cumulative hydrocarbon expulsion time Ts:

[0026]

[0027] Where: Es is the helium gas generation intensity of the source rock formation during the main hydrocarbon expulsion period, 10 4 m 3 / km 2 ; Hs is the thickness of the source rock formation, m; is the average value of the uranium equivalent content of the source rock formation, 10 -6 ; is the average value of the statistical density of source rock formations, g / cm 3 ; Ts is the cumulative hydrocarbon expulsion time of the source rock formation, Ma; A is the helium generation rate per unit mass of uranium, m 3 / g / Ma; B is the unit conversion coefficient, dimensionless.

[0028] Furthermore, the helium generation amount Gs of the source rock in the source kitchen during the main hydrocarbon expulsion period is calculated, including:

[0029] According to the helium generation intensity Es of each single well within and around the source kitchen, an Es plane contour map is compiled on the plane;

[0030] Based on the Es plane contour map of the source kitchen and its surroundings, the helium generation Gs of the source rock formation in the source kitchen during the main hydrocarbon expulsion period is calculated:

[0031] Gs=Es*Ss;

[0032] Where Ss is the area of ​​hydrocarbon source kitchen, km 2 .

[0033] Furthermore, the helium gas generation intensity Er of the reservoir formation of each well is calculated, including:

[0034] Calculate the average value of uranium equivalent content Uer in the reservoir formation of each well The average density of the formation where the reservoir is located and the thickness of the reservoir formation Hr; among them, Uer is calculated based on the single well energy spectrum logging data:

[0035] Uer=Ur+Thr / C;

[0036] Where: Uer is the uranium equivalent content of the reservoir stratum calculated based on the helium generation capacity, 10 -6 ; Ur is the uranium content of the reservoir stratum obtained by spectrum logging, 10-6 ; Thr is the thorium content of the reservoir stratum obtained by spectrum logging, 10 -6 ; C is the conversion factor, dimensionless;

[0037] Determine the decay time Tr of the reservoir formation. Tr is generally taken as the sedimentary age of the top interface of the reservoir formation, Ma;

[0038] According to the average value of uranium equivalent content Uer in the reservoir formation Average density of the reservoir formation The thickness of the reservoir stratum Hr and the decay time Tr of the reservoir stratum are used to calculate the helium content of the reservoir stratum.

[0039] Gas intensity Er:

[0040]

[0041] Where: Er is the helium gas generation intensity of the reservoir, 10 4 m 3 / km 2 ; Hr is the thickness of the reservoir formation, m; is the average value of the uranium equivalent content of the reservoir stratum, 10 -6 ; is the average density of the reservoir where the reservoir is located, g / cm 3 ; Tr is the decay time of the reservoir formation, Ma; A is the helium generation rate per unit mass of uranium, m 3 / g / Ma; B is the unit conversion coefficient, dimensionless.

[0042] Furthermore, the helium generation Gr of the reservoir formation within the gas reservoir and / or gas field is calculated, including:

[0043] According to the helium generation intensity Er of each single well within and around the gas reservoir and / or gas field, an Er plane contour map is compiled on the plane;

[0044] According to the helium generation intensity Er, the helium generation Gr of the reservoir is calculated:

[0045] Gr=Er*Sr;

[0046] Where Sr is the area of ​​gas reservoir and / or gas field, km 2 .

[0047] Furthermore, the mixing ratio R = Gs / Gr of helium from the source rock and the reservoir formation in the gas reservoir is calculated, including:

[0048] The ratio R of helium in the gas reservoir and / or gas field coming from the source rock strata and the reservoir strata is calculated based on the helium generation amount Gs of the source rock strata within the hydrocarbon source kitchen during the main hydrocarbon expulsion period and the helium generation amount Gr of the reservoir strata within the gas reservoir and / or gas field, where R = Gs / Gr.

[0049] In a second aspect, a device for calculating the source ratio of crustal helium includes: a unit for determining the range of gas reservoirs and / or gas fields, a unit for determining the range of hydrocarbon source kitchens, a unit for calculating the helium generation amount of source rocks, a unit for calculating the helium generation amount of reservoirs, and a unit for determining the source ratio;

[0050] A gas reservoir and / or gas field range determination unit is used to determine the range of the gas reservoir and / or gas field to be calculated;

[0051] Determine the hydrocarbon source kitchen range unit, which is used to determine the source rock series of the natural gas reservoir and delineate the specific hydrocarbon source kitchen range;

[0052] The unit for calculating the helium generation of source rocks is used to calculate the helium generation intensity Es of the source rocks of each well during the main hydrocarbon expulsion period, compile the Es plane contour map, and calculate the helium generation Gs of the source rocks in the source kitchen during the main hydrocarbon expulsion period;

[0053] The reservoir helium generation calculation unit is used to calculate the reservoir helium generation intensity Er of each well, compile the Er plane contour map, and calculate the helium generation Gr of the reservoir stratum within the gas reservoir and / or gas field;

[0054] The source ratio determination unit is used to calculate the precise mixing ratio R=Gs / Gr of helium from the source rock and the reservoir formation in the gas reservoir.

[0055] According to a third aspect, an electronic device includes a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other via the communication bus;

[0056] a memory storing a computer program;

[0057] The processor is configured to implement the above-mentioned method for calculating the shell-source helium source ratio when executing the computer program stored in the memory.

[0058] In a fourth aspect, a computer-readable storage medium stores a computer program, which, when executed by a processor, implements the above-mentioned method for calculating the shell-source helium source ratio.

[0059] The present disclosure has at least the following beneficial effects:

[0060] After determining that the helium in the gas reservoir comes from a mixture of the reservoir stratum and the source rock stratum, the present invention first determines the scope of the gas reservoir and / or gas field and the scope of the hydrocarbon source kitchen, and roughly delineates the scope of the two sets of strata "helium source kitchens" that contribute to the helium in the gas reservoir and / or gas field; secondly, an innovative method is used to quantitatively calculate the precise mixing ratio of helium from these two sets of helium source rocks, so that the analysis of the source of crustal helium moves from qualitative analysis to quantitative calculation.

[0061] The quantitative calculation method proposed in the present disclosure takes into account the specific gas reservoir and / or gas field range and its hydrocarbon source kitchen range, and the calculation results are more accurate and reasonable. It can quantitatively calculate the specific mixing ratio of helium from the gas reservoir reservoir and the stratum where the source rock is located, so that the analysis of the source of crustal helium can be moved from qualitative analysis to quantitative calculation.

[0062] Other features and advantages of the present disclosure will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present disclosure. The purpose and other advantages of the present disclosure can be achieved and obtained through the structures indicated in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0064] Figure 1 This is a flow chart of the calculation method according to an embodiment of the present disclosure;

[0065] Figure 2 This is a schematic diagram of the structure of a computing device according to an embodiment of the present disclosure;

[0066] Figure 3 It is a schematic diagram of the structure of an electronic device;

[0067] Figure 4 A detailed technical flowchart for the implementation of this disclosure;

[0068] Figure 5 This is a schematic diagram of the location and scope of the Jinqiu Gas Field in the Sichuan Basin;

[0069] Figure 6 This is a schematic diagram of the main reservoir-forming stages and times of the Jinqiu gas field (main hydrocarbon expulsion times of source rocks);

[0070] Figure 7 The main hydrocarbon expulsion period (a) of the Jinqiu gas field and its surrounding source rock strata (Upper Triassic Xujiahe Formation) and the helium gas generation intensity contour map of the Jurassic stratum where the reservoir is located (b) are shown. DETAILED DESCRIPTION

[0071] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present disclosure without making any creative efforts shall fall within the scope of protection of the present disclosure.

[0072] like Figure 1 As shown, the present disclosure provides a method for calculating the source ratio of shell-derived helium, the method comprising:

[0073] S101, determining the range of the gas reservoir and / or gas field to be calculated;

[0074] S102, determine the source rock series of the natural gas reservoir and delineate the specific hydrocarbon source kitchen range;

[0075] S103, calculating the helium generation intensity Es of the source rock of each well during the main hydrocarbon expulsion period, compiling a plane contour map of Es, and calculating the helium generation amount Gs of the source rock in the source kitchen during the main hydrocarbon expulsion period;

[0076] S104, calculate the reservoir helium gas generation intensity Er of each well, compile Er plane contour map, and calculate

[0077] Helium generation Gr of the strata to which the reservoir belongs within the gas reservoir and / or gas field;

[0078] S105, calculating the precise mixing ratio R=Gs / Gr of helium in the gas reservoir from the source rock and the reservoir formation.

[0079] In one embodiment, determining the scope of the gas reservoir and / or gas field to be calculated includes:

[0080] It generally includes all oil and gas wells in the gas reservoir and / or gas field. The boundaries can be the boundaries of 3D seismic blocks, major structural unit boundaries, major faults and the outer envelope of the reserve calculation unit.

[0081] In one embodiment, determining the source rock series of a natural gas reservoir and delineating the specific hydrocarbon source kitchen range includes:

[0082] Source rock evaluation and oil-gas source correlation are used to identify the source rock strata of the natural gas reservoir. The scope of the source kitchen is delineated based on a comprehensive study of the TOC distribution in the source rock, its thermal evolution, its hydrocarbon generation intensity, and its vertical oil and gas transport pathways.

[0083] In one embodiment, the helium generation intensity Es of the source rock of each well during the main hydrocarbon expulsion period is calculated, a plane contour map of Es is compiled, and the helium generation amount Gs of the source rock in the source kitchen during the main hydrocarbon expulsion period is calculated, including:

[0084] The average value of uranium equivalent content in source rock formations was calculated based on the energy spectrum logging data of each single well. Average density of source rock formations Thickness of source rock Hs;

[0085] Determine the cumulative time Ts of each major hydrocarbon expulsion period of the source rock, which is the sum of the time of each major accumulation period of the target gas reservoir and / or gas field;

[0086] According to the average value of uranium equivalent content Average density of source rock formations The thickness of the source rock Hs and the cumulative time of the main hydrocarbon expulsion period Ts of the source rock are used to calculate the helium gas generation intensity Es of the source rock formation;

[0087] According to the helium generation intensity Es of each single well, compile Es plane contour map;

[0088] According to the planar distribution of Es within the hydrocarbon source kitchen, the helium generation amount Gs of the source rock formation in the hydrocarbon source kitchen during the main hydrocarbon expulsion period is calculated.

[0089] In specific implementation, the average value of uranium equivalent content Ues of the source rock system of each well is calculated. Average value of source rock formation density and the thickness of the source rock formation Hs.

[0090] Among them, Ues is calculated based on the single well energy spectrum logging data:

[0091] Ues=Us+Ths / C;

[0092] Where: Ues is the uranium equivalent content of the source rock calculated based on the helium generation capacity, 10 -6 ; Us is the uranium content of the source rock formation energy spectrum logging, 10 -6 ; Ths is the thorium content of the source rock formation spectrum logging, 10 -6 ; C is the conversion factor, dimensionless.

[0093] Determine the cumulative time Ts of the main hydrocarbon expulsion time of the source rock, which is the sum of the time of each main accumulation period of the target gas reservoir / gas field: Ts = ∑Ts i , (i=1,2,...,n), Ts i Ts is the duration of the i-th single hydrocarbon expulsion, and n is the number of hydrocarbon expulsions from the source rock. iand n are determined comprehensively by the thermal evolution history of the source rock, gas reservoir inclusion analysis, inclusion homogenization temperature test and capture pressure test results, and host mineral dating results.

[0094] According to the average value of uranium equivalent content Ues of source rocks Average density of source rock formations The helium generation intensity Es of the source rock layer is calculated based on the source rock thickness Hs and the cumulative hydrocarbon expulsion time Ts:

[0095]

[0096] Where: Es is the helium gas generation intensity of the source rock formation during the main hydrocarbon expulsion period, 10 4 m 3 / km 2 ; Hs is the thickness of the source rock formation, m; is the average value of the uranium equivalent content of the source rock formation, 10 -6 ; is the average value of the statistical density of source rock formations, g / cm 3 ; Ts is the cumulative hydrocarbon expulsion time of the source rock formation, Ma; A is the helium generation rate per unit mass of uranium, m 3 / g / Ma; B is the unit conversion coefficient, dimensionless.

[0097] In one embodiment, the helium generation intensity Er of the reservoir formation of each well is calculated, a plane contour map of Er is compiled, and the helium generation Gr of the reservoir formation within the gas reservoir and / or gas field is calculated, including:

[0098] The average value of uranium equivalent content in the reservoir formation is calculated based on the energy spectrum logging data of each single well.

[0099] Average density of the reservoir formation The thickness of the reservoir formation is Hr;

[0100] Determine the decay time Tr of the reservoir formation, which is generally taken as the sedimentary age of the top interface of the reservoir formation;

[0101] According to the average uranium equivalent content of the reservoir formation Average formation density The formation thickness Hr and decay time Tr are used to calculate the helium generation intensity Er of the formation where the reservoir is located;

[0102] According to the helium generation intensity Er of each single well, compile Er plane contour map;

[0103] The helium generation Gr of the reservoir stratum in the gas reservoir and / or gas field is calculated based on the distribution of Er within the gas reservoir and / or gas field.

[0104] In specific implementation, the average value of the uranium equivalent content Uer of the reservoir layer of each well is calculated.

[0105] The average density of the formation where the reservoir is located And the thickness of the reservoir formation Hr. Among them, Uer is calculated based on the single well energy spectrum logging data:

[0106] Uer=Ur+Thr / C;

[0107] Where: Uer is the uranium equivalent content of the reservoir stratum calculated based on the helium generation capacity, 10 -6 ; Ur is the uranium content of the reservoir stratum obtained by spectrum logging, 10 -6 ; Thr is the thorium content of the reservoir stratum obtained by spectrum logging, 10 -6 ; C is the conversion factor, dimensionless.

[0108] To determine the decay time Tr of the formation where the reservoir is located, the top interface sedimentary age of the formation where the reservoir is located, Ma, is generally taken.

[0109] According to the average value of uranium equivalent content Uer in the reservoir formation Average density of the reservoir formation The thickness of the reservoir stratum Hr and the decay time Tr of the reservoir stratum are used to calculate the helium content of the reservoir stratum.

[0110] Gas intensity Er:

[0111]

[0112] Where: Er is the helium gas generation intensity of the reservoir, 10 4 m 3 / km 2 ; Hr is the thickness of the reservoir formation, m; is the average value of the uranium equivalent content of the reservoir stratum, 10 -6 ; is the average density of the reservoir where the reservoir is located, g / cm 3 ; Tr is the decay time of the reservoir formation, Ma; A is the helium generation rate per unit mass of uranium, m 3 / g / Ma; B is the unit conversion coefficient, dimensionless.

[0113] In one embodiment, determining the precise source ratio of helium in a gas reservoir and / or gas field to be calculated includes:

[0114] After determining that the helium in the gas reservoir comes from a mixture of the reservoir stratum and the source rock stratum, the precise ratio R=Rs / Gr of the two is calculated based on the helium generation Gr of the reservoir stratum within the gas reservoir and / or gas field and the helium generation Gs of the source rock stratum within the source kitchen during the main hydrocarbon expulsion period.

[0115] like Figure 2 As shown, a device for calculating the source ratio of crustal helium includes: a unit 201 for determining the range of gas reservoirs and / or gas fields, a unit 202 for determining the range of hydrocarbon source kitchens, a unit 203 for calculating the helium generation amount of source rocks, a unit 204 for calculating the helium generation amount of reservoirs, and a unit 205 for determining the source ratio;

[0116] A gas reservoir and / or gas field range determination unit is used to determine the range of the gas reservoir and / or gas field to be calculated;

[0117] Determine the hydrocarbon source kitchen range unit, which is used to determine the source rock series of the natural gas reservoir and delineate the specific hydrocarbon source kitchen range;

[0118] The unit for calculating the helium generation of source rocks is used to calculate the helium generation intensity Es of the source rocks of each well during the main hydrocarbon expulsion period, compile the Es plane contour map, and calculate the helium generation Gs of the source rocks in the source kitchen during the main hydrocarbon expulsion period;

[0119] The reservoir helium generation calculation unit is used to calculate the helium generation intensity Er of the reservoir formation of each well, compile the Er plane contour map, and calculate the helium generation Gr of the reservoir formation within the gas reservoir and / or gas field;

[0120] The source ratio determination unit is used to calculate the precise mixing ratio R=Gs / Gr of helium from the source rock and the reservoir formation in the gas reservoir.

[0121] like Figure 3 As shown, the present disclosure provides an electronic device, including a processor 301, a communication interface 302, a memory 303 and a communication bus 304, wherein the processor 301, the communication interface 302 and the memory 303 communicate with each other through the communication bus 304;

[0122] Memory 303, storing computer programs;

[0123] The processor 301 is configured to implement the above method when executing the computer program stored in the memory 303 .

[0124] The present disclosure provides a computer-readable storage medium storing a computer program, which implements the above method when executed by a processor.

[0125] The computer-readable storage medium may be included in the device / apparatus described in the above embodiments, or may exist independently without being incorporated into the device / apparatus. The computer-readable storage medium carries one or more programs, which, when executed, implement the method according to the embodiments of the present disclosure.

[0126] According to an embodiment of the present disclosure, a computer-readable storage medium may be a non-volatile computer-readable storage medium, such as, but not limited to, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In the present disclosure, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0127] In order to enable those skilled in the art to better understand the present disclosure, the principles of the present disclosure are described as follows with reference to the accompanying drawings:

[0128] After determining that the helium in the gas reservoir and / or gas field comes from a mixture of the reservoir stratum and the source rock stratum, the present invention first determines the scope of the gas reservoir and / or gas field and the scope of the source kitchen, and roughly delineates the scope of the two sets of strata "helium source kitchens" that contribute to the helium in the gas reservoir; secondly, an innovative method is used to quantitatively calculate the mixing ratio of helium from these two sets of helium source rocks, so that the analysis of the source of crustal helium moves from qualitative analysis to quantitative calculation.

[0129] like Figure 4 As shown, the present disclosure addresses the current situation where there is a lack of a quantitative calculation method for the precise source mixing ratio of crust-derived helium in natural gas reservoirs. A method for calculating the quantitative mixing ratio of crust-derived helium in natural gas reservoirs from the reservoir stratum and the source rock stratum is proposed. The method includes:

[0130] (1) Determine the scope of the gas reservoir and / or gas field to be calculated. Generally, it should include all existing oil and gas wells. The boundaries can be based on 3D seismic block boundaries, major structural unit boundaries, major faults, and the outer envelope of the reserve calculation unit.

[0131] (2) Using conventional source rock evaluation and oil and gas source comparison techniques, the source rock strata of the natural gas reservoir are determined, and based on comprehensive research on the TOC planar distribution of the source rock, the thermal evolution of the source rock, the hydrocarbon generation intensity of the source rock, and the vertical oil and gas transmission pathways, the specific scope of the source kitchen is delineated.

[0132] (3) Determine the main gas reservoir formation periods and their time ranges by using tectonic evolution history, hydrocarbon generation and expulsion history of source rocks, inclusion temperature measurement, and authigenic mineral dating.

[0133] (4) Calculate the uranium equivalent content Ue, the average value of formation density ρ, and the formation thickness H of the source rock and reservoir formation of each well.

[0134] (5) Determine the cumulative time Ts of the main hydrocarbon expulsion period of the source rock, which is the sum of the time of each main accumulation period determined in step (3).

[0135] (6) Calculate the helium gas generation intensity Es of the source rock of each single well during the main hydrocarbon expulsion period.

[0136] (7) Prepare a plane contour map of the helium gas generation intensity Es of the source rock during the main hydrocarbon expulsion period.

[0137] (8) Calculate the helium generation Gs of the source rocks in the source kitchen during the main hydrocarbon expulsion period.

[0138] (9) Determine the decay age Tr of the reservoir.

[0139] (10) Calculate the helium gas generation intensity Er of the reservoir formation of each well.

[0140] (11) Prepare a plane contour map of the helium gas generation intensity Er in the formation where the reservoir is located.

[0141] (12) Calculate the helium generation Gr of the reservoir formation within the gas reservoir and / or gas field.

[0142] (13) Calculate the exact mixing ratio R = Gs / Gr of helium in the gas reservoir and / or gas field from the source rock and the reservoir formation.

[0143] The present disclosure proposes a new method for quantitatively calculating the specific proportion of helium in gas reservoirs and / or gas fields originating from the reservoir formation and the source rock formation, thereby moving the analysis of the source of crustal helium from qualitative analysis to quantitative calculation.

[0144] The present disclosure was applied to the Jinqiu gas field in the Sichuan Basin. It was calculated that the ratio of helium in the gas field coming from the Xujiahe Formation, the source rock stratum, and the Jurassic stratum where the reservoir is located, is approximately 1:10. This conclusion is consistent with the qualitative conclusion obtained by geological analysis (helium mainly comes from the Jurassic), but the present disclosure has reached a quantitative level and calculated the specific mixed source ratio.

[0145] like Figure 5As shown, the calculation method disclosed in the present invention was implemented in the Jinqiu gas field in the Sichuan Basin. First, the scope of the gas field was delineated based on the drilling and 3D seismic boundaries. Afterwards, based on the gas source comparison and source rock evaluation results, the source rock was determined to be the Xujiahe Formation of the Upper Triassic, and the scope of the specific source kitchen was delineated based on the vertical migration of natural gas in the work area mainly along the faults: consistent with the scope of the Jinqiu gas field. Third, based on the results of the tectonic evolution history of the area, the evolution history of source rocks, inclusion temperature measurement, and inclusion host mineral dating, it was clarified that the area had two periods of hydrocarbon filling, namely 87-68 Ma in the late Cretaceous and 47-38 Ma in the middle Paleogene, as shown in the figure. Figure 6 As shown. Therefore, it can be determined that the cumulative time Ts of the main hydrocarbon expulsion period of the source rock is 28Ma. Fourth, the helium gas generation intensity of 12 wells in the area and its periphery was calculated, and the helium gas generation intensity plane contour map of the Xujiahe Formation of the source rock stratum and the Jurassic stratum where the reservoir is located was outlined, as shown in Figure 7 As shown. Fifth, using the formula that helium generation G equals helium generation intensity E multiplied by area S, we calculated the helium generation Gs of the source rocks within the source kitchen during the main hydrocarbon expulsion period and the helium generation Gr of the reservoir formations within the gas field. Finally, we calculated the mixing ratio of helium from the source rock formations to the reservoir formations: R = Gs / Gr = 1:10. This means that the ratio of helium in the Jinqiu gas field derived from the Xujiahe Formation, the source rock formation, and the Jurassic formation, the reservoir formation, is 1:10.

[0146] Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A method for calculating the proportion of shell-derived helium, characterized in that: The method comprises: Determine the extent of the gas reservoir and / or gas field to be calculated; Determine the source rock series of the natural gas reservoir and determine the scope of the source kitchen; Based on the range of the source kitchen, calculate the helium generation intensity Es of the source rock of each well during the main hydrocarbon expulsion period, and calculate the helium generation amount Gs of the source rock in the source kitchen during the main hydrocarbon expulsion period; Calculate the helium generation intensity Er of the stratum where the reservoir is located in each well according to the scope of the gas reservoir and / or gas field, and calculate the helium generation Gr of the stratum where the reservoir is located within the scope of the gas reservoir and / or gas field; Calculate the mixing ratio of helium from the source rock and the reservoir formation in the gas reservoir, R = Gs / Gr.

2. The method for calculating the shell helium source ratio according to claim 1, wherein: Determine the extent of the gas reservoir and / or gas field to be calculated, including: Generally, all current oil and gas wells are included. The boundaries of oil and gas wells can be the boundaries of 3D seismic blocks, boundaries of major structural units, major faults or outer envelopes of reserve calculation units.

3. The method for calculating the shell helium source ratio according to claim 1, wherein: Determine the source rock series of the natural gas reservoir and the scope of the source kitchen, including: Source rock evaluation and oil and gas source correlation are used to determine the source rock strata of natural gas reservoirs and / or gas fields, and the scope of the source kitchen is delineated based on the planar distribution of TOC of the source rock, the thermal evolution of the source rock, the hydrocarbon generation intensity of the source rock and the vertical oil and gas transmission pathways.

4. The method for calculating the shell helium source ratio according to claim 1, wherein: Calculation of the helium gas generation intensity Es of each well's source rock during the main hydrocarbon expulsion period includes: Calculate the average value of uranium equivalent content Ues of the source rock layers of each well Average value of source rock formation density and the thickness of the source rock formation Hs; Among them, Ues is calculated based on the single well energy spectrum logging data, and the formula is as follows: Ues=Us+Ths / C; Where: Ues is the uranium equivalent content of the source rock calculated based on the helium generation capacity, 10 -6 ; Us is the uranium content of the source rock formation energy spectrum logging, 10 -6 ; Ths is the thorium content of the source rock formation spectrum logging, 10 -6 ; C is the conversion factor, dimensionless; Determine the cumulative time Ts of the main hydrocarbon expulsion time of the source rock, where Ts is the sum of the main accumulation periods of the target gas reservoir and / or gas field: Ts = ∑Ts i , (i=1,2,...,n), Ts i is the duration of the i-th single hydrocarbon expulsion, n is the number of hydrocarbon expulsions from the source rock; Ts i and n are determined comprehensively through the thermal evolution history of the corresponding source rock, gas reservoir inclusion analysis, inclusion homogenization temperature test and capture pressure test results, and host mineral dating results; According to the average value of uranium equivalent content Ues of source rocks Average density of source rock formations The helium generation intensity Es of the source rock layer is calculated based on the source rock thickness Hs and the cumulative hydrocarbon expulsion time Ts: Where: Es is the helium gas generation intensity of the source rock formation during the main hydrocarbon expulsion period, 10 4 m 3 / km 2 ; Hs is the thickness of the source rock formation, m; is the average value of the uranium equivalent content of the source rock formation, 10 -6 ; is the average value of the statistical density of source rock formations, g / cm 3 ; Ts is the cumulative hydrocarbon expulsion time of the source rock formation, Ma; A is the helium generation rate per unit mass of uranium, m 3 / g / Ma; B is the unit conversion coefficient, dimensionless.

5. The method for calculating the shell helium source ratio according to claim 1, wherein: Calculation of the helium generation Gs of source rocks in the source kitchen during the main hydrocarbon expulsion period includes: According to the helium generation intensity Es of each single well within and around the source kitchen, an Es plane contour map is compiled on the plane; Based on the Es plane contour map of the source kitchen and its surroundings, the helium generation Gs of the source rock formation in the source kitchen during the main hydrocarbon expulsion period is calculated: Gs=Es*Ss; Where Ss is the area of ​​hydrocarbon source kitchen, km 2 .

6. The method for calculating the shell helium source ratio according to claim 1, wherein: Calculate the helium gas generation intensity Er of the reservoir formation of each well, including: Calculate the average value of uranium equivalent content Uer in the reservoir formation of each well The average density of the formation where the reservoir is located and the thickness of the reservoir formation Hr; among them, Uer is calculated based on the single well energy spectrum logging data: Uer=Ur+Thr / C; Where: Uer is the uranium equivalent content of the reservoir stratum calculated based on the helium generation capacity, 10 -6 ; Ur is the uranium content of the reservoir stratum obtained by spectrum logging, 10 -6 ; Thr is the thorium content of the reservoir stratum obtained by spectrum logging, 10 -6 ; C is the conversion factor, dimensionless; Determine the decay time Tr of the reservoir formation, where Tr is the top interface sedimentary age of the reservoir formation, Ma; According to the average value of uranium equivalent content Uer in the reservoir formation Average density of the reservoir formation The helium generation intensity Er of the reservoir is calculated based on the reservoir thickness Hr and the reservoir decay time Tr: Where: Er is the helium gas generation intensity of the reservoir, 10 4 m 3 / km 2 ; Hr is the thickness of the reservoir formation, m; is the average value of the uranium equivalent content of the reservoir stratum, 10 -6 ; is the average density of the reservoir where the reservoir is located, g / cm 3 ; Tr is the decay time of the reservoir formation, Ma; A is the helium generation rate per unit mass of uranium, m 3 / g / Ma; B is the unit conversion coefficient, dimensionless.

7. The method for calculating the shell helium source ratio according to claim 1, wherein: Calculate the helium generation Gr of the reservoir formation within the gas reservoir and / or gas field, including: According to the helium generation intensity Er of each single well within and around the gas reservoir and / or gas field, an Er plane contour map is compiled on the plane; According to the helium generation intensity Er, the helium generation Gr of the reservoir is calculated: Gr=Er*Sr; Where Sr is the area of ​​gas reservoir and / or gas field, km 2 .

8. The method for calculating the shell helium source ratio according to claim 6, wherein: Calculate the mixing ratio of helium from source rocks and reservoir formations in the gas reservoir, R = Gs / Gr, including: The ratio R of helium in the gas reservoir and / or gas field coming from the source rock strata and the reservoir strata is calculated based on the helium generation amount Gs of the source rock strata within the hydrocarbon source kitchen during the main hydrocarbon expulsion period and the helium generation amount Gr of the reservoir strata within the gas reservoir and / or gas field, where R = Gs / Gr.

9. A device for calculating the ratio of shell-derived helium, characterized in that: include: Determine the unit of gas reservoir and / or gas field range, determine the unit of hydrocarbon source kitchen range, calculate the unit of hydrocarbon source rock helium generation, calculate the unit of reservoir helium generation and determine the unit of source ratio; A gas reservoir and / or gas field range determination unit is used to determine the range of the gas reservoir and / or gas field to be calculated; Determine the hydrocarbon source kitchen range unit, which is used to determine the hydrocarbon source rock strata of the natural gas reservoir and / or gas field, and determine the specific range of the hydrocarbon source kitchen; The unit for calculating the helium generation amount of source rocks is used to calculate the helium generation intensity Es of the source rocks of each well during the main hydrocarbon expulsion period, and to calculate the helium generation amount Gs of the source rocks in the source kitchen during the main hydrocarbon expulsion period; The reservoir helium generation calculation unit is used to calculate the reservoir helium generation intensity Er of each well and calculate the helium generation Gr of the reservoir formation within the gas reservoir and / or gas field; The source ratio determination unit is used to calculate the precise mixing ratio R=Gs / Gr of helium in the gas reservoir coming from the source rock and the formation where the reservoir is located.

10. An electronic device, characterized in that: The processor, the communication interface, the memory and the communication bus are connected to each other via the communication bus. a memory storing a computer program; The processor is configured to implement the method for calculating the shell source helium source ratio according to any one of claims 1 to 8 when executing the computer program stored in the memory.

11. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, a method for calculating the shell-derived helium source ratio according to any one of claims 1 to 8 is implemented.

Images