JP7160425B2 - Hydrocarbon residue evaluation method for high-facility-overaged hydrocarbon source rocks - Google Patents

Description

TECHNICAL FIELD The present invention belongs to the technical field of oil and gas mining, and specifically relates to a method for evaluating the amount of residual hydrocarbons in high-overmatured marine phase hydrocarbon source rocks.

There are huge shale oil and gas resources hidden in the hydrocarbon source rock system. It has critical implications for evaluation and optimization of favorable exploration targets. How to build a residual amount evaluation model of marine high-over-mature hydrocarbon source rock and calculate its hydrocarbon residual amount, this is the earth A long-standing unresolved conundrum in the chemical community, the root cause is that the maturity of marine high-over-matured hydrocarbon source rocks is generally very high, and unmatured and under-matured hydrocarbon source rocks are common. is insufficient to reconstruct the complete hydrocarbon generation-residue-emission evolutionary process of hydrocarbon source rocks.

In the process of estimating the residual abundance of hydrocarbon source rocks, the most important parameters include determination of two parameters: the critical condition for hydrocarbon formation and the thermal evolution of the hydrocarbon residual potential. When evaluating the hydrocarbon residual content of high-overaged hydrocarbon source rocks, the predecessors mainly adopt the following methods to solve this problem. 1) By experience, we artificially take the critical condition of hydrocarbon formation, for example, the degree of thermal evolution R ₀ (i.e. vitrinite reflectance) is 0.4%, 0.5%, 0.6%. etc.; , to compensate for the lack of samples of unripened and under-ripened hydrocarbon source rocks in the study area, and to calculate the amount of residual hydrocarbons based on the hydrocarbon generation potential method.

The above methods have the following drawbacks. First, different types of hydrocarbon source rocks have different critical conditions for the initiation of hydrocarbon emissions, and the critical conditions for hydrocarbon production determined by different scholars are different for each person, so the method is too subjective and not scientific enough. Second, it is difficult to find alternative unmatured and under-matured hydrocarbon source rock samples, and unmatured rocks from the lower Palaeozoic marine facies of China are difficult to find. The under-ripened hydrocarbon source rocks have yet to be discovered, and the paucity of unmatured and under-ripened hydrocarbon source rocks in paleomarine formations is a very common phenomenon; The use of unripe and underripened samples from newer formations or different basins as replenishment samples is highly problematic, since their depositional environment, organic phases, organic matter type and organic matter enrichment conditions all vary greatly. different. These are important factors influencing the evolution of hydrocarbon formation-residue-emission of hydrocarbon source rocks. Unless the hydrocarbon residual characteristics of hydrocarbon source rocks are clearly recognized, it is difficult to scientifically predict the source of shale oil and gas resource potential, and ultimately target selection areas for shale oil and gas exploration. affect the evaluation of

In order to solve the above problems in the conventional technology, that is, the conventional method for evaluating the amount of residual hydrocarbons in highly-over-ripened hydrocarbon source rocks has low accuracy and relies on unripened and under-ripened samples. In order to do so, the present invention provides a method for evaluating the residual amount of hydrocarbons in marine high-overmatured hydrocarbon source rocks, which method is a cross-sectional view of the hydrocarbon production potential evolution of high-overmatured hydrocarbon source rocks and Step S100 of constructing the hydrogen index evolution profile of hydrocarbon source rock, determining the critical condition of hydrocarbon discharge of high-overmatured hydrocarbon source rock, and calculating the primitive hydrocarbon generation potential of hydrocarbon source rock inversely. a step S300 for inverse calculation of the critical conditions for hydrocarbon production of the highly-overaged hydrocarbon source rock; and a step S400 for constructing a hydrocarbon production-emission-residue model for the highly-overmatured hydrocarbon source rock. a step S500 of determining the hydrocarbon production rate, hydrocarbon emission rate and hydrocarbon retention rate of the highly-overaged hydrocarbon source rock; and a step S600 of calculating .

In some preferred embodiments, the construction method of step S100 specifically includes obtaining hydrocarbon production potential index, hydrogen index and equivalent vitrinite reflectance through pyrolysis experiment of hydrocarbon source rock.

Hydrocarbon formation potential evolution cross-section and hydrocarbon source rock of high-overmatured hydrocarbon source rock based on the hydrocarbon formation potential index, the hydrogen index and the equivalent vitrinite reflectance in a vitrinite-deficient marine facies stratum. The hydrogen index evolution cross section of the high-overaged hydrocarbon source rock is constructed, and the hydrocarbon generation potential evolution cross section of the high-overaged hydrocarbon source rock is a relationship diagram between the hydrocarbon generation potential index and the equivalent vitrinite reflectance, and the high - Hydrogen index evolution cross section of overaged hydrocarbon source rock is a relationship diagram between the hydrogen index and the equivalent vitrinite reflectance.

であり、そのうち、Ｓ₁，Ｓ₂は、それぞれ、単位質量の炭化水素源岩試料を３００℃、３００℃～６００℃に加熱して獲得した炭化水素量であり、単位がｍｇ ＨＣ／ｇであり、ＴＯＣは、単位質量の炭化水素源岩における総有機炭素含有量であり、単位がｍｇ／ｇである。 The hydrocarbon production potential index is

Among them, S ₁ and S ₂ are the amount of hydrocarbon obtained by heating a unit mass hydrocarbon source rock sample to 300°C and 300°C to 600°C, respectively, and the unit is mg HC/g. and TOC is the total organic carbon content in a unit mass of hydrocarbon source rock, with units of mg/g.

である。 The hydrogen exponent is

is.

であり、
そのうち、Ｔ_maxは炭化水素源岩の熱分解実験の最も高い熱分解ピーク温度である。 the equivalent vitrinite reflectance is _R0 ;

and
Among them, T _max is the highest pyrolysis peak temperature in pyrolysis experiments of hydrocarbon source rocks.

In some preferred embodiments, the method for determining the critical condition for hydrocarbon discharge from the high-overaged hydrocarbon source rock includes obtaining a uniform temperature distribution map of fluid inclusions through an inclusion experiment, and Determine the main temperature peak of the inclusions in the first stage based on the uniform temperature distribution map of the inclusions, At the time of the homogeneous temperature main peak, we obtain the corresponding minimum value R _min in the isotherm, and this value is R _oe , the critical maturity of hydrocarbon emissions corresponding to the critical condition of hydrocarbon emissions.

であり、そのうち、ａ、ｂ、ｃ、ｄのいずれも定数である、ことである。 In some preferred embodiments, the method of inverse computation of the pristine hydrocarbon production potential of the high-overaged hydrocarbon source rock comprises: Obtaining the exponential envelope I _g ,

where all of a, b, c and d are constants.

である。 obtaining the primitive hydrocarbon production potential _Iog of the hydrocarbon source rock based on the envelope of the hydrocarbon production potential exponent and the critical maturity of the hydrocarbon emissions;

is.

であり、そのうち、ｅ、ｆ、ｇ、ｈのいずれも定数である、ことである。 In some preferred embodiments, the inverse computation method for the critical condition of hydrocarbon production of the high-overaged hydrocarbon source rock is the hydrogen index envelope HI and get

where all of e, f, g and h are constants.

Based on the envelope of the hydrogen index of the high-overmatured hydrocarbon source rock, the primitive hydrocarbon production potential of the high-overmatured hydrocarbon source rock, the criticality of hydrocarbon production of the high-overmatured hydrocarbon source rock Obtain the condition R _og where R _og is the equivalent vitrinite reflectance corresponding to the intersection of the hydrogen index envelope and the pristine hydrocarbon production potential of the high-overaged hydrocarbon source rock.

In some preferred embodiments, the method for constructing a hydrocarbon production-emission-residue model of the high-overmatured hydrocarbon source rock includes: Hydrogen Index Evolution Cross Section of High-overmatured Hydrocarbon Source Rock, Critical Conditions for Hydrocarbon Emission from the High-overmatured Hydrocarbon Source Rock, Primordial Hydrocarbon Formation Potential of the High-overmatured Hydrocarbon Source Rock, Said Based on the critical condition of hydrocarbon formation of high-overmatured hydrocarbon source rock and MATLAB software, a hydrocarbon formation-emission-residue model of high-overmatured hydrocarbon source rock is constructed, and in the model, R _og , R _oe , HI, _{Ig and Iog .}

In some preferred embodiments, step S500 specifically includes calculating the hydrocarbon production of the high-overmatured hydrocarbon source rock based on the hydrocarbon production-emission-residue model of the high-overmatured hydrocarbon source rock. calculating the rate, hydrocarbon emission rate and hydrocarbon retention rate.

である。 The hydrocarbon production rate of the hydrocarbon source rock is q _g ,

is.

である。 The hydrocarbon emission rate of the hydrocarbon source rock is q _e ,

is.

である。 The hydrocarbon residual rate of the hydrocarbon source rock is _qr ,

is.

In some preferred embodiments, the method for calculating the hydrocarbon residual strength of the hydrocarbon source rock is specifically based on the hydrocarbon emission rate, organic matter richness, and thickness of the hydrocarbon source rock corresponding to different thermal evolution stages. and obtain the hydrocarbon residual intensity _Ir at different thermal evolution stages of the hydrocarbon source rocks, depending on the density integral.

である。

is.

は炭化水素源岩の密度であり、Ａは炭化水素源岩の分布面積であり、ＴＯＣ₀は炭化水素源岩の原始的総有機炭素含有量である。 H is the thickness of the hydrocarbon source rock,

is the density of the hydrocarbon source rock, A is the distribution area of the hydrocarbon source rock, and TOC ₀ is the primitive total organic carbon content of the hydrocarbon source rock.

である。 In some preferred embodiments,

is.

である。

is.

In some preferred embodiments, the total amount of hydrocarbon residue _Qr for each geological age is obtained based on the hydrocarbon residue strength.

である。 _Qr is

is.

1) The present invention constructs a new model of hydrocarbon residue in highly-overaged hydrocarbon source rocks, which does not depend on unaged and under-aged samples, and is capable of Residual features can be studied.

2) The present invention forms a new method and flow of hydrocarbon residue evaluation of marine high-overaged hydrocarbon source rocks, and develops marine facies hydrocarbon source rocks in strata where unmatured and low-matured samples are insufficient. A more scientific calculation of hydrocarbon residues to provide a scientific basis for the evaluation of shale oil and gas resources in high-overmatured hydrocarbon source rock growth areas, and evaluation of target selection areas for shale oil and gas exploration. can provide influential theoretical guidance to It is also of great significance in improving the efficiency of shale oil and gas exploration work and significantly reducing the cost of exploration work.

Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of the following non-limiting examples with reference to the drawings.

1 is a flow schematic diagram of one embodiment of the present invention; FIG. FIG. 2 is a conceptual model diagram of hydrocarbon formation-discharge-residue of highly-overaged hydrocarbon source rock in the present invention. Hydrocarbon generation potential and hydrogen exponential evolution profiles of high-overaged algal hydrocarbon source rocks of the Sichuan Basin. Histogram of uniform temperature distribution of Dolomite fluid inclusions in the Sichuan Basin. It is a sedimentation reserve history and thermal evolution history map of Moxi 8 well in the Sichuan Basin. Formation-extraction-residue model of high-overaged algal hydrocarbon source rocks in the Sichuan Basin. Fig. 4 is the present hydrocarbon residual intensity map of the Sichuan Basin Algal Hydrocarbon source rock of the Sichuan Basin; 1 is a structural schematic diagram of a computer system of an electronic device suitable for implementing an embodiment of the present application, according to one embodiment of the present invention; FIG.

Preferred embodiments of the present invention will be described below with reference to the drawings. Those skilled in the art should understand that these embodiments are merely for interpreting the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

、水素指数

及び同等ビトリナイト反射率Ｒ₀を獲得し、ビトリナイトが足りない海相地層で、炭化水素生成ポテンシャル指数、水素指数及び同等ビトリナイト反射率に基づいて、炭化水素源岩の炭化水素生成ポテンシャル進化断面図及び炭化水素源岩の水素指数進化断面図を構築することを含み、そのうち、炭化水素源岩の炭化水素生成ポテンシャル進化断面図は、炭化水素生成ポテンシャル指数と同等ビトリナイト反射率との関係図であり、炭化水素源岩の水素指数進化断面図は、水素指数と同等ビトリナイト反射率との関係図である。 The present invention provides a method for evaluating hydrocarbon residues in marine high-overaged hydrocarbon source rocks, the method comprising the following steps. In step S100, a cross-sectional view of the hydrocarbon formation potential evolution of the high-overaged hydrocarbon source rock and a cross-sectional view of the hydrogen index evolution of the hydrocarbon source rock are constructed. Hydrogen production potential exponent

, the hydrogen exponent

and the equivalent vitrinite reflectance R ₀ , and in the marine facies stratum lacking vitrinite, based on the hydrocarbon formation potential index, the hydrogen index and the equivalent vitrinite reflectance, the hydrocarbon formation potential evolution cross section of the hydrocarbon source rock and including constructing a hydrogen index evolution cross-section of hydrocarbon source rock, wherein the hydrocarbon formation potential evolution cross-section of hydrocarbon source rock is a relationship chart between hydrocarbon formation potential index and equivalent vitrinite reflectance; Hydrogen index evolution cross-section of hydrocarbon source rock is a relationship diagram between hydrogen index and equivalent vitrinite reflectance.

であり、そのうち、ａ、ｂ、ｃ、ｄのいずれも定数であり、炭化水素生成ポテンシャル指数の包絡線及び炭化水素排出の臨界熟成度に基づいて、炭化水素源岩の原始的炭化水素生成ポテンシャルＩ_ogを取得し、

である、ことである。 In step S200, determining the critical condition of hydrocarbon emission from the high-overmatured hydrocarbon source rock, inversely calculating the primitive hydrocarbon generation potential of the high-overmatured hydrocarbon source rock, wherein the criticality of hydrocarbon emission is The method of determining the conditions is to obtain a uniform temperature distribution map of fluid inclusions by inclusion experiments, and based on the obtained uniform temperature distribution map of fluid inclusions, the uniform temperature main Determine the main peak and obtain the corresponding minimum value R _min in the isotherm at the main peak of uniform temperature of the first stage inclusions according to the typical well deposition history and thermal evolution map. and that this value is _Roe , the critical maturity of hydrocarbon emissions corresponding to the critical condition of hydrocarbon emissions. The inverse calculation method of the primitive hydrocarbon production potential of the hydrocarbon source rock is to acquire the envelope I _g of the hydrocarbon production potential index according to the hydrocarbon production potential evolution cross section of the hydrocarbon source rock,

where a, b, c, and d are all constants, and based on the envelope of the hydrocarbon production potential exponent and the critical maturity of hydrocarbon emissions, the primitive hydrocarbon production potential of the hydrocarbon source rock is get _Iog ,

It is.

In step S300, the critical condition for hydrocarbon generation of the high-overmatured hydrocarbon source rock is reversely calculated. Obtain the line HI, and based on the envelope of the hydrogen index and the primitive hydrocarbon production potential of the hydrocarbon source rock, obtain the equivalent vitrinite reflectance corresponding to the intersection of the two, i.e., the carbonization of the hydrocarbon source rock. R _og is the critical condition for hydrogen production.

In step S400, a hydrocarbon generation-emission-residue model of high-overmatured hydrocarbon source rock is constructed. Hydrogen Index Evolution Profile of Aged Hydrocarbon Source Rocks, Critical Conditions for High-overmatured Hydrocarbon Emissions, Primitive Hydrocarbon Formation Potential of High-overmatured Hydrocarbon Source Rocks, Hydrocarbons of High-overmatured Hydrocarbon Source Rocks It involves building a hydrocarbon production-emission-residue model for highly-overaged hydrocarbon source rocks based on critical conditions of production and MATLAB software.

であり、

であり、

である。 In step S500, the hydrocarbon production rate, hydrocarbon emission rate and hydrocarbon retention rate of the high-overaged hydrocarbon source rock are determined, specifically, the hydrocarbon production-discharge of the high-overaged hydrocarbon source rock - based on residual models, calculating the hydrocarbon production rate q _g of the hydrocarbon source rock, the hydrocarbon emission rate q _e of the hydrocarbon source rock, and the hydrocarbon retention rate q _r of the hydrocarbon source rock, of which ,

and

and

is.

In step S600, the hydrocarbon residual strength and hydrocarbon residual amount of the high-overaged hydrocarbon source rock are calculated, specifically, the hydrocarbon emission rate, organic matter richness, and hydrocarbon source corresponding to different thermal evolution stages. According to the integration of rock thickness and density, the hydrocarbon residual intensity _Ir at different thermal evolution stages of the hydrocarbon source rock is obtained, and based on the hydrocarbon residual intensity, the total amount of hydrocarbon residual _Qr in each geological epoch is calculated. Including getting the

である。

is.

である。

is.

である。

is.

である。

is.

The present invention constructs a model suitable for evaluating residual hydrocarbons in high-overaged hydrocarbon source rocks without relying on low-matured samples, and a method for evaluating the amount of residual hydrocarbons in sea phase high-overaged hydrocarbon source rocks. to provide a scientific basis for the assessment of shale oil and gas resources, and provide influential theoretical guidance and technical support for the assessment of target selection areas for shale oil and gas exploration.

Hereinafter, the present invention will be further described with reference to the drawings in conjunction with the Sichuan Basin embodiment.

The Sichuan Basin is located in central China, with a basin area of about 19×10 ⁴ km ² , and is one of China's major natural gas producing regions. The Sichuan Basin is a typical collapsible oil and gas basin. Through multiple rotational tectonic movements and superimposed remodeling of various types of basins, it has formed multiple combinations of oil-generating layers, reservoirs and barrier layers, and has a multi-layer system of oil.・It has the characteristic of containing gas. The lower three mats of the Shindan system in the Sichuan Basin are generally marine facies carbonate rock strata, and the stratigraphy targeted for research in this application is the Prehistoric Tokagegumi of the Shindan system. The lantern group is divided into four lithofacies stages from top to bottom: light 4 (Z ₂ d ⁴ ), light 3 (Z ₂ d ³ ), light 2 (Z ₂ d ² ) and light 1 (Z ₂ d ¹ ). be done. Of these, the Toukagegumi Mouniwa, an important Sichuan Basin seismic source hydrocarbon source rock, is mainly distributed in the Tokage 4 (Z ₂ d ⁴ ) and Tok 2 (Z ₂ d ² ) stages, with a burial depth of 5000 m. , the hydrocarbon source rocks have all reached the high-overaged thermal evolution stage, with a thickness of 300 m to 1350 m, widely distributed in the Sichuan Basin.

、水素指数

、同等ビトリナイト反射率Ｒ₀を算出して得る。 1 to 7, the present invention proposes a hydrocarbon residue evaluation method for marine high-overmatured hydrocarbon source rocks, including a hydrocarbon emission conceptual model for high-overmatured hydrocarbon source rocks. Constructing includes the following steps, as shown in FIG. In step S100, a hydrocarbon production potential evolution cross-section of the high-overaged hydrocarbon source rock and a hydrogen index evolution cross-section of the hydrocarbon source rock are constructed. Hydrocarbon production potential exponent from parameters obtained from pyrolysis experiments of Sichuan Basin algal hydrocarbon source rocks

, the hydrogen exponent

, by calculating the equivalent vitrinite reflectance R ₀ .

Hydrocarbon formation potential evolution profile of high-overmatured hydrocarbon source rocks and hydrogen index of hydrocarbon source rocks based on hydrocarbon formation potential index, hydrogen index and equivalent vitrinite reflectance in vitrinite-deficient marine facies strata Constructing the evolution cross section (Fig. 3), the hydrocarbon formation potential evolution cross section of the hydrocarbon source rock is a relationship diagram in which the hydrocarbon formation potential exponent changes with the equivalent vitrinite reflectance, and the hydrocarbon source rock The hydrogen index evolution cross-section is a relationship diagram in which the hydrogen index changes with the equivalent vitrinite reflectance.

であり、そのうち、Ｔ_maxは、炭化水素源岩の熱分解実験の最も高い熱分解ピーク温度であり、Ｒ₀の単位が％で、Ｔ_maxの単位が℃である。 moreover,

where T _max is the highest pyrolysis peak temperature in the pyrolysis experiment of hydrocarbon source rock, the unit of R ₀ is %, and the unit of T _max is °C.

In step S200, the critical condition of hydrocarbon discharge of the Sichuan Basin high-overaged algaemic hydrocarbon source rock is determined, and the primitive hydrocarbon production potential of the hydrocarbon source rock is reversely calculated. First, as can be seen from (microscopic) microscopic thin section analysis and geological analysis, inclusions of Stage 3 were formed in the Sichuan Basin Lantern Group, and inclusions of Stage 1 were formed in dolomite grains. The uniform temperature distribution map of the fluid inclusions (Fig. 4) was obtained by analyzing the inclusion experiment of the lamp set, and the uniform temperature peak temperature of the inclusions in the first stage was between 120 and 130°C. and for quantitative characterization, we take a median value of 125°C (which will be taken as the final main peak), at which the hydrocarbon source rocks begin to emit large amounts of hydrocarbons. means Combined with the sedimentation reserve history and thermal evolution history of Moxi 8 well, a typical well in the Sichuan Basin (Fig. 5), the critical maturity R _oe of hydrocarbon discharge from Toukagegumi algae hydrocarbon source rock can be reversed. In the figure, the smallest _R0 in the 125°C isotherm of the _Toukagegumi is the critical maturity Roe of the hydrocarbon emission of the Toukagegumi algae hydrocarbon source rock, and its _Roe is 0.92. %. This means that the Sichuan Basin Sichuan algae rock starts to emit a large amount of hydrocarbons when R ₀ is 0.92%, that is, the criticality of hydrocarbon emission The degree of maturity (R _oe ) corresponds to R _oe =0.92%.

である。 Acquiring the envelope curve I _g of the hydrocarbon generation potential index according to the hydrocarbon generation potential evolution cross-section of the highly-overaged hydrocarbon source rock,

is.

Depending on the envelope of the hydrocarbon formation potential exponent of the high-overmatured hydrocarbon source rock and the critical maturity of hydrocarbon emissions, the primitive hydrocarbon formation potential I _og of the hydrocarbon source rock is obtained. , fitting a mathematical relational expression between the two according to the relationship between the envelope of the hydrocarbon production potential exponent and the degree of thermal evolution. The hydrocarbon generation potential corresponding to the location is the primitive hydrocarbon generation potential of the hydrocarbon source rock, and according to the calculation, the primitive hydrocarbon generation potential of the Sichuan Basin algal rock is I _og = 756 mg HC/g TOC.

In addition, the critical conditions for hydrocarbon formation in high-overaged algae hydrocarbon source rocks of the Sichuan Basin are calculated inversely.

であり、獲得された四川盆地の震旦系藻雲岩の原始的炭化水素生成ポテンシャル及び該水素指数の包絡線に応じて、炭化水素源岩の炭化水素生成の臨界条件Ｒ_og（即ち、水素指数の包絡線と炭化水素源岩の原始的炭化水素生成ポテンシャルとの交点箇所に対応する同等ビトリナイト反射率）を獲得し、本実施例において、

である。 Acquire the envelope HI of the hydrogen index according to the hydrogen index evolution cross section of the Sichuan Basin Sichuan basin algae hydrocarbon source rock,

, and depending on the obtained primitive hydrocarbon formation potential of Sichuan basin algal rocks and the envelope curve of the hydrogen index, the critical condition R _og for hydrocarbon formation of hydrocarbon source rocks (i.e., hydrogen The equivalent vitrinite reflectance corresponding to the intersection of the index envelope and the primitive hydrocarbon production potential of the hydrocarbon source rock) was obtained and, in this example,

is.

In step S400, the hydrocarbon production potential evolution cross-section of the high-overaged hydrocarbon source rock, the hydrogen index evolution cross-section of the hydrocarbon source rock, the critical condition of hydrocarbon discharge, and the primitive hydrocarbon production potential of the hydrocarbon source rock , based on the critical conditions of hydrocarbon formation of hydrocarbon source rocks and MATLAB software, a hydrocarbon formation-emission-residue model of high-overaged hydrocarbon source rocks (in this example, as shown in FIG. 6, the Sichuan Basin build a hydrocarbon generation-emission-residue model of high-overmatured hydrocarbon source rocks of the Shindan algae hydrocarbon source rocks), and in the model, R _og , R _oe , HI, I _g and Label _Iog . In this model, the hydrocarbon formation potential and hydrogen index of hydrocarbon source rocks decrease with increasing thermal maturity.

In step S500, the hydrocarbon production rate, hydrocarbon discharge rate and hydrocarbon retention rate of the Sichuan Basin high-overaged algal hydrocarbon source rock are determined. Based on the hydrocarbon production-emission-residue model of the highly-overaged hydrocarbon source rock, the hydrocarbon production rate q _g of the hydrocarbon source rock, the hydrocarbon emission rate q e of the hydrocarbon source rock, and the hydrocarbon emission rate q _e of the hydrocarbon source rock Calculate the hydrocarbon residual rate _qr .

である。

is.

である。

is.

である。

is.

In step S600, the hydrocarbon residual strength and hydrocarbon residual amount of the Sichuan basin algal hydrocarbon source rock are determined. Depending on the integration of hydrocarbon emission rate, organic matter richness, thickness and density of hydrocarbon source rocks corresponding to different thermal evolution stages, we obtain hydrocarbon residual strength _Ir at different thermal evolution stages of hydrocarbon source rocks. , to obtain the total amount of residual hydrocarbons _Qr for each geological age based on the residual strength of hydrocarbons.

であり、Ｈは炭化水素源岩の厚さであり、

は炭化水素源岩の密度であり、Ａは炭化水素源岩の分布面積であり、ＴＯＣ₀は炭化水素源岩の原始的総有機炭素含有量である。 Among them

and H is the thickness of the hydrocarbon source rock,

is the density of the hydrocarbon source rock, A is the distribution area of the hydrocarbon source rock, and TOC ₀ is the primitive total organic carbon content of the hydrocarbon source rock.

である。

is.

である。

is.

である。

is.

であり、四川盆地の震旦系藻雲岩炭化水素源岩の炭化水素残留総量Ｑ_rは

油相当量である。シェールガスの有利な探査目標区域は、炭化水素残留強度が最も高い区域に位置する。 Furthermore, referring to FIG. 7, FIG. 7 is a distribution map of the current hydrocarbon residual strength of the Sichuan basin algal hydrocarbon source rock, and the hydrocarbon residual strength I _r is the highest.

, and the total amount of residual hydrocarbons Q _r in the Sichuan basin algae hydrocarbon source rocks is

Equivalent to oil. Advantageous exploration target areas for shale gas are located in areas of highest hydrocarbon residual strength.

The present invention further provides a shale gas well location acquisition system based on hydrocarbon residual amount evaluation of marine facies high-overaged hydrocarbon source rock, wherein hydrocarbon residuals of the marine facies high-overaged hydrocarbon source rock A hydrocarbon residual strength distribution map generating device for obtaining a hydrocarbon residual strength distribution map based on a quantitative evaluation method and using the map as a first distribution map, and a geological information database including geological maps and contour lines of areas awaiting evaluation , superimposing contour lines on the hydrocarbon residual strength distribution map to obtain a second distribution map, and obtaining one or more shale gas well location areas waiting for selection based on the preset first area information; , a shale gas well location optimization device arranged to select the pending selection shale gas well location area with the lowest contour as the optimal shale gas well location area; a display device used to display the added second distribution map.

The preset first area information is preset surface area information necessary for mining a shale gas well, and includes a preset area and a preset altitude head. The shape of the preset area in the first preset area information is generally square or rectangular.

The method for obtaining the shale gas well location area waiting for selection based on the preset first area information is based on the hydrocarbon residual contour line in the hydrocarbon residual strength distribution map, the preset hydrocarbon residual strength Acquire a hydrocarbon residual strength continuous area larger than the numerical value as a first analysis waiting area, acquire the smallest circumscribed rectangle of the hydrocarbon residual strength continuous area as a second analysis waiting area, and use the sliding window to obtain the second analysis waiting area. obtaining an area that completely fits in a first analysis waiting area and satisfies the preset first area information as a shale gas well location area waiting for selection; A window is created based on the preset area of the preset first area information.

When performing a contour comparison for the pending selection shale gas well location areas, the comparison may be made using the contour line where the center point of the pending selection shale gas well location areas is located.

If there is a shale gas well location area waiting to be selected that is not significantly different from the contour line of the optimal shale gas well location, at this time, the road network information is used as a condition for further optimization judgment, and the selection closest to the existing road network is selected. The pending shale gas well location area may be updated as the optimal shale gas well location area. The road network information can be stored in the geological information database, and when performing this step, the road network information is retrieved from the geological information database and superimposed on the second distribution map to form a third distribution map. When road network information is added, the display device is used to display a third distribution map with the addition of optimal shale gas well location areas.

Said display device can also be used to display all pending selection of shale gas well location areas and to provide optimization level notation from low to high according to the contour lines located, as well as a human interface device Adjustments to the level of optimization of shale gas well location areas pending selection may also be made based on information obtained by (eg, mouse, keyboard, voice control device, etc.).

The above embodiments are only for the purpose of illustrating the present invention, and any method implementation steps, etc., can be changed, and equivalent substitutions and improvements can be made on the basis of the technical solution of the present invention. Insofar, neither should be excluded from the protection scope of the present invention.

Referring now to FIG. 8, there is shown a structural schematic diagram of a server computer system suitable for implementing embodiments of the methods, systems and apparatus of the present application. The server shown in FIG. 8 is merely an example and should not impose any limitation on the functionality and scope of use of embodiments of the present application.

As shown in FIG. 8, the computer system can store programs stored in Read Only Memory (ROM) 802 or programs loaded from storage 808 into Random Access Memory (RAM) 803. It comprises a central processing unit (CPU) 801 capable of executing various appropriate operations and processes accordingly. The RAM 803 further stores various programs and data necessary for operating the system. The CPU 801 , ROM 802 and RAM 803 are interconnected via a bus 804 . An input/output (I/O, Input/Output) interface 805 is also connected to bus 804 .

The following members: an input unit 806 including a keyboard, a mouse, etc.; an output unit 807 including, for example, a cathode ray tube (CRT, Cathode Ray Tube), a liquid crystal display (LCD, Liquid Crystal Display), etc., a speaker, etc.; etc., and a communication unit 809 including network interface cards such as LAN (Local Area Network) cards and modems are connected to the I/O interface 805 . A communication unit 809 executes communication processing via a network such as the Internet. A driver 810 is also connected to the I/O interface 805 as needed. A removable medium 811 such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory is attached to the driver 810 as required, and computer programs read therefrom are installed in the storage unit 808 as required. it becomes easier to be

In particular, according to embodiments of the present disclosure, the processes described with reference to the flowcharts above may be implemented as computer software programs. For example, an embodiment of the present disclosure includes a computer program product comprising a computer program borne on a computer readable medium, the computer program comprising program code for performing the methods illustrated in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network and/or installed from removable media 811 via communication unit 809 . When the computer program is executed by the central processing unit (CPU 801), the above functions defined in the method of the present application are performed.

In particular, according to embodiments of the present invention, the processes described with reference to the flowcharts above may be implemented as computer software programs. For example, embodiments of the present invention include computer program products, including computer programs embodied on computer readable media and including program code for performing the methods illustrated in the flowcharts. In such embodiments, the computer program may be downloaded and installed from a network in part by communication and/or installed from removable media. The computer program, when executed by a central processing unit (CPU), performs the functions defined above in the method of the present invention. It should be noted that computer-readable media according to the present invention may be computer-readable signal media or computer-readable storage media or any combination of the above. A computer-readable storage medium may include, for example, but is not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus or device, or a combination of any of the foregoing. More specific examples of computer readable storage media are electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read only memory (ROM), erasable programmable It may include, but is not limited to, read-only memory (EPROM or flash memory), fiber optics, portable compact disc read-only memory (CD-ROM), optical storage components, magnetic storage devices, or any contiguous combination of the above. . In the present invention, a computer-readable storage medium may be a tangible medium containing or storing any program that is used in or in combination with an instruction execution system, apparatus or device. You may let In the context of the present invention, a computer readable signal medium may be a data signal bearing computer readable program code, which may be embodied in baseband or transmitted as part of a carrier wave. Such transmitted data signals may take many forms, including, but not limited to, electromagnetic signals, optical signals, or any suitable combination of the foregoing. A computer-readable signal medium can also be any computer-readable medium other than a computer-readable storage medium, which is used in an instruction execution system, apparatus, or device. or transmit, transmit or transport a program for use in conjunction therewith. The program code contained on a computer readable medium may be transported on any suitable medium, including wireless, wire, optical cable, RF (radio frequency), etc., or any suitable combination of the above, It is not limited to these.

Computer program code for carrying out the operations of the present invention may be written in one or more program design languages, or combinations thereof, which program design languages may be object oriented programming languages such as Java, Smalltalk, C++. and further includes conventional procedural program design languages, such as the "C" language or similar program design languages. Program code may run entirely on a user computer, partially on a user computer, as a separate software package, partially on a user computer, partially on a remote computer, or entirely remote. It may run on a computer or server. In the context of remote computers, the remote computer can be connected to the user computer by any kind of network, including a local area network (LAN) or wide area network (WAN), or it can be connected to an external computer (e.g. , connected by the Internet using an Internet service provider).

The flowcharts and block diagrams in the figures illustrate possible system architectures, functionality, and operation of systems, methods and computer program products according to various embodiments of the present invention. In this regard, each box in a flowchart or block diagram can represent a module, program segment, or portion of code, wherein the module, program segment, or portion of code is one or more predetermined Contains executable instructions to implement logic functions. It should also be noted that, in some switchable implementations, the functions noted in the box may occur out of the order noted in the figures. For example, two boxes shown in succession can actually be executed essentially in parallel, and they may be executed in reverse order, depending on the functionality involved. It should also be noted that each box in the block diagrams and/or flowcharts, and combinations of boxes in the block diagrams and/or flowcharts, are implemented in dedicated hardware-based systems that perform the given function or operation. or be implemented in a combination of dedicated hardware and computer instructions.

Also, the terms "first", "second", etc. are only for the purpose of distinguishing between similar objects and are not intended to describe or indicate a particular order or chronological order.

The term "including" or any other similar term means including non-exclusively. Thus, any process, method, article or apparatus/device that includes a set of elements includes those elements in addition to other elements not explicitly stated or inherent in these processes, methods, articles or apparatus/devices. It can contain further elements.

Up to this point, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the drawings, but those skilled in the art should understand that the protection scope of the present invention is not limited to these specific embodiments. Should. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or replacements to the relevant technical features, and these changed or replaced technical solutions shall fall within the protection scope of the present invention. be.

Claims (2)

A method for evaluating hydrocarbon residues in marine high-overaged hydrocarbon source rocks, the method comprising the steps of:
Step S100 of constructing a hydrocarbon generation potential evolution cross-section of high-overaged hydrocarbon source rock and a hydrogen index evolution cross-section of hydrocarbon source rock, specifically, the construction method is based on the thermal Through decomposition experiments, the hydrocarbon formation potential index, the hydrogen index and the equivalent vitrinite reflectance of the high-overmatured hydrocarbon source rock were obtained. constructing a hydrocarbon production potential evolution profile of a high-overaged hydrocarbon source rock and a hydrogen index evolution profile of the hydrocarbon source rock based on equivalent vitrinite reflectance, and The formation potential evolution cross section is a relationship diagram between the hydrocarbon formation potential index and the equivalent vitrinite reflectance, and the hydrogen index evolution cross section of the hydrocarbon source rock is a relationship between the hydrogen index and the equivalent vitrinite reflectance. It is a relationship diagram, and the hydrocarbon production potential index is

Among them, S ₁ and S ₂ are the amounts of hydrocarbon obtained when a unit mass hydrocarbon source rock sample is heated to 300°C and 300°C to 600°C, respectively, and the unit is mgHC/g. , TOC is the total organic carbon content in a unit mass of hydrocarbon source rock, the unit is mg/g, and the hydrogen index is

and the equivalent vitrinite reflectance is _R0 ,

where T _max is the highest pyrolysis peak temperature of the pyrolysis experiment of hydrocarbon source rock, step S100;
The step S200 of determining the critical condition for hydrocarbon emission of the high-overmatured hydrocarbon source rock and inversely calculating the primitive hydrocarbon generation potential of the hydrocarbon source rock, comprising: The method of determining the critical condition of hydrocarbon discharge is to obtain a uniform temperature distribution map of fluid inclusions by inclusion experiments, and based on the uniform temperature distribution map of fluid inclusions, determining a uniform temperature main peak and obtaining the corresponding minimum value R _min in the isotherm at the uniform temperature main peak of the first stage inclusions according to a typical well deposition history and thermal evolution map; that this value is _Roe , the critical maturity of hydrocarbon emissions corresponding to the critical condition of hydrocarbon emissions;
The inverse calculation method of the primitive hydrocarbon production potential of the high-overmatured hydrocarbon source rock obtains the envelope I _g of the hydrocarbon production potential index according to the hydrocarbon production potential evolution cross-section of the hydrocarbon source rock. death,

wherein a, b, c, and d are all constants, and based on the envelope of the hydrocarbon production potential index and the critical maturity of the hydrocarbon discharge, the high-overmatured hydrocarbon source rock Obtaining the primitive hydrocarbon production potential I _og ,

is, step S200;
Step S300 of inversely computing the critical condition for hydrocarbon generation of the highly-over-aged hydrocarbon source rock, wherein the method of inversely computing the critical condition for hydrocarbon generation of the highly-over-matured hydrocarbon source rock comprises: Acquire the hydrogen index envelope HI based on the hydrogen index evolution cross section of the source rock,

wherein e, f, g, and h are all constants, and based on the hydrogen index envelope and the primitive hydrocarbon formation potential of the hydrocarbon source rock, the high-overaged hydrocarbon source rock _{where R og is} the equivalent vitrinite reflectance corresponding to the intersection of the hydrogen index envelope and the primordial hydrocarbon formation potential of the hydrocarbon source rock. a step S300;
A step S400 of constructing a hydrocarbon generation-emission-residue model of a highly-overaged hydrocarbon source rock, wherein the method of constructing a hydrocarbon generation-emission-residue model of the highly-overaged hydrocarbon source rock includes: Hydrocarbon production potential evolution cross-section of high-overmatured hydrocarbon source rock, hydrogen index evolution cross-section of the high-overmatured hydrocarbon source rock, critical condition of hydrocarbon discharge of the high-overmatured hydrocarbon source rock, Based on the primordial hydrocarbon production potential of the high-overaged hydrocarbon source rock, the critical conditions for hydrocarbon production of the high-overaged hydrocarbon source rock , a high- building a hydrocarbon generation-emission-residue model of the overaged hydrocarbon source rock and labeling R _og , R _oe , HI, I _g and I _og in the model, step S400;
Step S500 of determining the hydrocarbon production rate, the hydrocarbon emission rate and the hydrocarbon retention rate of the high-overaged hydrocarbon source rock, wherein the hydrocarbon production-emission-retention model of the high-overmatured hydrocarbon source rock Based on, the hydrocarbon production rate of the hydrocarbon source rock, the hydrocarbon discharge rate of the hydrocarbon source rock, and the hydrocarbon retention rate of the hydrocarbon source rock are calculated, and the hydrocarbon production rate of the hydrocarbon source rock is q _g is

and the hydrocarbon emission rate of the hydrocarbon source rock is q _e , i.e.

and the hydrocarbon residual rate of the hydrocarbon source rock is _qr , i.e.

, step S500;
In the step S600 of calculating the hydrocarbon residual strength and hydrocarbon residual amount of the highly-overaged hydrocarbon source rock, the method of calculating the hydrocarbon residual strength of the highly-overaged hydrocarbon source rock is specifically: Acquire the hydrocarbon residual intensity _Ir at different thermal evolution stages of hydrocarbon source rocks according to the integration of hydrocarbon emission rate, organic matter abundance, thickness and density of hydrocarbon source rocks corresponding to different thermal evolution stages is that

, where H is the thickness of the hydrocarbon source rock,

is the density of the hydrocarbon source rock, A is the distribution area of the hydrocarbon source rock, _TOC0 is the primitive total organic carbon content of the hydrocarbon source rock,
Obtaining the total amount of residual hydrocarbons Q _r for each geological age based on the residual strength of hydrocarbons;

and a step S600.

and

The method for evaluating the residual amount of hydrocarbons in marine facies high-overmatured hydrocarbon source rocks according to claim 1, characterized in that:

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