CN112820363A - Effective hydrocarbon source rock organic carbon lower limit determination method - Google Patents
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- 229930195733 hydrocarbon Natural products 0.000 title claims abstract description 155
- 150000002430 hydrocarbons Chemical class 0.000 title claims abstract description 154
- 239000011435 rock Substances 0.000 title claims abstract description 146
- 239000004215 Carbon black (E152) Substances 0.000 title claims abstract description 135
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 89
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 89
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000006243 chemical reaction Methods 0.000 claims abstract description 27
- 238000000197 pyrolysis Methods 0.000 claims abstract description 22
- 239000005416 organic matter Substances 0.000 claims abstract description 16
- 238000007599 discharging Methods 0.000 claims abstract description 5
- 230000008569 process Effects 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 5
- 230000008021 deposition Effects 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 4
- 230000007423 decrease Effects 0.000 claims description 3
- 230000000593 degrading effect Effects 0.000 claims description 3
- 238000013508 migration Methods 0.000 claims description 3
- 230000005012 migration Effects 0.000 claims description 3
- 238000011160 research Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 208000035126 Facies Diseases 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- -1 carbonate hydrocarbon Chemical class 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000003348 petrochemical agent Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The invention discloses a method for determining the lower limit of organic carbon of an effective hydrocarbon source rock. The method comprises the following steps: calculating the hydrocarbon content in the source rock when a certain depth reaches a critical saturation degree; calculating the initial hydrocarbon generation potential: calculating the conversion rate of the corresponding organic matter into hydrocarbon according to the depth; then, according to the conversion rate, calculating the initial hydrocarbon generation potential by the content of the hydrocarbon required during hydrocarbon discharge; calculating the required organic carbon content in the source rock when discharging hydrocarbons: and (3) making a correlation graph of the hydrocarbon generation potential and the organic carbon content TOC according to rock pyrolysis data to obtain a fitting relational expression of the hydrocarbon generation potential and the organic carbon content TOC of different types of hydrocarbon source rocks, and calculating the organic carbon content required by the source rocks when the hydrocarbon is discharged at different depths according to the fitting relational expression. The method is convenient and quick, and the lower limit of the organic carbon of the effective hydrocarbon source rock with different oil drainage saturation degrees can be determined by using relatively common organic carbon and rock pyrolysis test items in a geochemical method.
Description
Technical Field
The invention belongs to the technical field of resource evaluation in oil-gas geology; in particular to a method for determining the lower limit of organic carbon of an effective hydrocarbon source rock.
Background
The focus in the evaluation of the effective hydrocarbon source rock is 'what organic matter abundance lower limit is adopted', which relates to what rock is the effective hydrocarbon source rock, how thick the effective hydrocarbon source layer is, and how large the distribution area and the volume of the effective hydrocarbon source layer are. As early as 20 years ago, Jones (1978) pointed out that "the minimum organic carbon content necessary to make a potential parent rock effective, rather than a constant, varied widely depending on many other variables, i.e., in theory, source rocks of different basins, different depositional environments, different organic matter types, different maturity, should have different lower organic matter abundance limits; however, in practical work, a uniform lower limit of the abundance of the organic matter is often adopted for convenient operation. In order to ensure sufficient hydrocarbon production and sufficient drainage efficiency, an effective source rock must have a corresponding abundance of organic matter (and its type, maturity and associated physical and chemical conditions). For the lower limit of organic carbon, Jones considers 2.5%. The majority of the world's important reservoirs are produced primarily from 2.5% by weight of parent rock in total organic carbon, and often in the range of over 10%. There are many examples such as Merilidian, Allan and Riya species, Calif. Shandong Mitsuda, Chalker series black shale in the Bay of Pradenhua, Baken and Wudford in the Central continental, West Siberian Zhongsheng, etc. The lower limit of organic carbon is more than or equal to 1% by the scholars of Momper, McAulif fe, Barker, etc. They indicate that potential parent rocks containing 0.5% to 1% organic carbon, although some amount of hydrocarbons may be produced, often do not form an effective "self-expulsion mechanism" - -such as an effective crack opening, "three-dimensional kerogen network" formation, "hydrocarbon pore center network" formed by the coalescence of isolated oil droplets, and the like. Only a small fraction of the potential parent rocks are actually "actually involved in the flooding process", and perhaps most kerogen families are actually non-petrochemicals. The lower limit of the abundance of the organic matters proposed by most scholars in China is obviously lower than the international standard, the lower limit of the abundance of the organic matters of the carbonate hydrocarbon source rock is considered to be 0.1-0.2%, and the lower limit of the abundance of the organic matters of the carbonate widely adopted by field exploration departments is 0.1%; the lower limit of the organic matter abundance of the marine-facies argillaceous source rock is 0.5 percent, and the lower limit is the same as that of the land-facies (lake-facies) argillaceous source rock. With regard to mudstone as a hydrocarbon source rock, the evaluation standard of mudstone is currently more uniform in the petroleum industry, and the organic carbon content of 0.4% is used as the boundary between non-oil-producing rock and oil-producing rock, while the evaluation standard of mudstone as an effective hydrocarbon source rock is still widely divergent and varies from 0.4%, 0.5%, 0.7%, 1.0% and even larger.
Disclosure of Invention
In order to solve the technical problem of difficult definition of organic carbon of the effective source rock, the invention provides a method for determining the lower limit of the organic carbon of the effective source rock, which determines the lower limit of the organic carbon of the effective source rock by utilizing the relation among the critical saturation of oil discharge, the hydrocarbon content during the oil discharge and the hydrocarbon generation potential, points out the vertical and horizontal spreading range and the distribution rule of the organic carbon of the effective source rock, and guides the oil-gas exploration and development.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for determining the lower limit of organic carbon of an effective hydrocarbon source rock comprises the following steps:
s100: calculating the hydrocarbon content in the source rock when a certain depth reaches a critical saturation degree;
s200: calculating initial hydrocarbon generation potential;
s300: the desired organic carbon content in the source rock at the time of hydrocarbon expulsion was calculated.
Preferably, the step of S200 calculating the initial hydrocarbon generation potential comprises:
calculating the conversion rate of the corresponding organic matter into hydrocarbon according to the depth; then, the initial hydrocarbon generation potential is calculated from the hydrocarbon content required during the hydrocarbon discharge according to the conversion rate.
Preferably, the step of S300 calculating the required organic carbon content in the source rock upon expulsion of hydrocarbons comprises:
and (3) making a correlation graph of the hydrocarbon generation potential and the organic carbon content TOC according to rock pyrolysis data to obtain a fitting relational expression of the hydrocarbon generation potential and the organic carbon content TOC of different types of hydrocarbon source rocks, and calculating the organic carbon content required by the source rocks when the hydrocarbon is discharged at different depths according to the fitting relational expression.
In a preferred embodiment of the present invention, there is provided a method for determining the lower limit of organic carbon in an effective source rock, comprising the steps of:
s100: calculating the hydrocarbon content in the source rock when the critical saturation is reached at a certain depth:
the invention discloses a research premise of organic carbon abundance lower limit of effective hydrocarbon source rock, which comprises the following 4 assumptions:
(1) mudstone porosity decreases with depth;
(2) the primary migration phase is a continuous oil phase and the critical saturation is 10 percent;
(3) assuming that the available carbon is all degrading the raw hydrocarbons;
(4) the unit volume of the hydrocarbon source rock absorbs hydrocarbon (particle absorption and organic matter absorption) to a certain amount;
according to the above assumptions, the hydrocarbon content in the source rock at a certain depth (porosity) of the source rock per unit volume at the initial deposition can be obtained, and the formula is:
the data in the formula are determined according to the actual measurement result: HCRock-total hydrocarbon content of rock, mg/g;
V0initial Source rock volume, cm3；
Srow board-critical saturation of oil discharge,%;
ρhydrocarbonsDensity of hydrocarbon fluid, mg/cm3；
ρRock (A. B. EDensity of source rock in mg/cm3；
S1-soluble hydrocarbons in rock pyrolysis report, mg/g;
s200: calculating the initial hydrocarbon generation potential:
calculating the conversion rate of the corresponding organic matter into hydrocarbon according to the depth; then, according to the conversion rate, calculating the initial hydrocarbon generation potential by the content of the hydrocarbon required during hydrocarbon discharge;
wherein, according to the hydrocarbon generation dynamics experimental data, a conversion rate and depth change formula is simulated, as shown in figure 2; the formula of the conversion rate and the depth change of organic matters in the source rock at a certain moment in the process of the geological history is as follows:
＜3000m：y＝405.68ln(x)+3253.2；
≥3000m：y＝21261x2-29263x+12969；
wherein x is the conversion, i.e. the total hydrocarbon yield, mg/g; y is depth, m;
s300: calculating the required organic carbon content in the source rock when discharging hydrocarbons:
the hydrocarbon generation potential of different types of hydrocarbon source rocks is different, and the hydrocarbon generation potential (S1+ S2) and the organic carbon content TOC can be plotted according to rock pyrolysis data (Tmax is less than 435 ℃); the fitting relations of the type III, type II and type I organic matters are respectively as follows:
S1+S2＝109.82TOC-0.5；
S1+S2＝328.09TOC-0.5；
S1+S2＝747.21TOC-0.5；
wherein S1 is soluble hydrocarbon in a rock pyrolysis report, mg/g; s2 pyrolysis hydrocarbon, mg/g;
based on the relation, the organic carbon content required by various hydrocarbon source rocks during hydrocarbon discharge with different porosities (depths) can be obtained.
In fact, complete degradation of organic matter in source rock requires a higher degree of thermal evolution, i.e. over-maturation. From the actual data, Ro (maturity of source rock) reaches 2% at 5000 m. The original organic carbon value required by discharging hydrocarbon at 5000 meters is taken as the standard of the source rock. The organic carbon standards required for different vent saturations are shown in table 1:
table 1 different effluent hydrocarbon saturation requirements organic carbon standards
According to the actual situation, the organic carbon standard at 10% of oil drainage saturation is reasonable, namely the organic carbon standard of the type I hydrocarbon source rock is 0.18%, the organic carbon standard of the type II hydrocarbon source rock is 0.4%, and the organic carbon standard of the type III hydrocarbon source rock is 1.1%. The organic carbon standard at different depths can be obtained according to a conversion rate and depth change formula.
Compared with the prior art, the method for determining the lower limit of the organic carbon of the effective source rock has the following beneficial effects:
1) the TOC lower limit is determined reasonably by using a formula summarized from experimental data, the TOC lower limit of the effective hydrocarbon source rock organic carbon in different regions can be determined according to the distribution characteristics of the sample points in different regions, and the method is suitable for other types of regions with complicated geological conditions, variable sedimentation characteristics and dispersed sample points.
2) The method has the characteristics of convenience and quickness, and the lower limit of the organic carbon of the effective source rock with different oil drainage saturation can be determined by using relatively common organic carbon and rock pyrolysis test items in a geochemical method.
Drawings
FIG. 1 is a flow chart of a method for determining the lower limit of organic carbon in an effective source rock according to the present invention.
FIG. 2 is a graph of conversion as a function of depth.
FIG. 3 is a graph of the correlation of organic carbon content and hydrocarbon potential of type III source rock.
FIG. 4 is a graph of the correlation of organic carbon content and hydrocarbon potential of type II source rock.
FIG. 5 is a graph of the correlation of organic carbon content and hydrocarbon potential of type I source rock.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below in connection with preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
The effective source rock partitioning is performed by taking the L-pit S area as an example. The ancient climate in the sand three period generally changes from early semiarid to late semihumid, and the water body gradually desalts. The early and middle stages of sand, water and water are changed into warm and wet, the water quantity is rich, the evaporation is weakened, the lake surface rises due to the rapid sinking of the basin, the lake water deepens and widens, the sediment differentiation is obvious, and the sediment has the characteristics of rapid sedimentation and rapid filling. The three-section hydrocarbon source rock is mainly dark mudstone, is wide in distribution and large in overall thickness, and has good conditions for determining the lower limit of organic carbon of the effective hydrocarbon source rock by using the method.
The method for determining the lower limit of organic carbon of the effective source rock is according to the flow shown in figure 1, and comprises the following steps:
s100: hydrocarbon content in source rock at critical saturation:
the lower limit research premise of the organic carbon abundance of the effective source rock comprises the following 4 assumptions:
1) mudstone porosity decreases with depth;
2) the primary migration phase is a continuous oil phase and the critical saturation is 10 percent;
3) assuming that the available carbon is all degrading the raw hydrocarbons;
4) the unit volume of the source rock absorbs hydrocarbons (particle absorption, organic matter absorption) to a certain amount.
According to the hypothesis, the hydrocarbon content of the source rock when the unit volume of the source rock reaches the critical saturation when the initial deposition is 5000m can be obtained, and the formula is as follows:
the data in the formula are determined according to the actual measurement result: HCRock-total hydrocarbon content of rock, mg/g;
V0initial Source rock volume, cm3；
Srow board-critical saturation of oil discharge,%;
ρhydrocarbonsDensity of hydrocarbon fluid, mg/cm3；
ρRock (A. B. EDensity of source rock in mg/cm3；
S1-soluble hydrocarbons in rock pyrolysis report, mg/g.
S200: initial hydrocarbon generation potential. According to the conversion rate of organic matters in the source rock at each moment in the process of the geological history, the initial hydrocarbon generation potential can be calculated according to the required hydrocarbon content during the hydrocarbon discharge.
The conversion calculation process is conventional in the art, for example, in the embodiment of the present invention, the hydrocarbon generation kinetics experiment is performed by taking core from 200m to 5000m, and core every 200m, and the kerogen oil yield, oil cracking gas yield, kerogen gas yield, cumulative oil yield, total gas yield, the conversion x calculated finally, and the fitting formula shown in fig. 2 are as follows:
＜3000m：y＝405.68㏑(x)+3253.2；
≥3000m：y＝21261x2-29263x+12969；
wherein x is the conversion, i.e. the total hydrocarbon yield, mg/g; y is depth, m.
The data measured during the conversion calculation in this example are shown in table 2:
TABLE 2 data sheet of experimentally determined conversion
S300: the desired organic carbon content in the source rock at the time of hydrocarbon expulsion was calculated. The hydrocarbon generation potential of different types of hydrocarbon source rocks is different, and the hydrocarbon generation potential and the organic carbon content of the rocks can be plotted according to rock pyrolysis data (Tmax is less than 435 ℃). As will be appreciated by those skilled in the art, the data of S1 and S2 are obtained from the rock pyrolysis data report, and different values are obtained at different depths, and then a corresponding relationship fit is found according to the total organic carbon data, as shown in FIGS. 3-5, FIG. 3 is a graph of the correlation between the organic carbon content and the hydrocarbon-forming potential of type III rock, FIG. 4 is a graph of the correlation between the organic carbon content and the hydrocarbon-forming potential of type II rock, and FIG. 5 is a graph of the correlation between the organic carbon content and the hydrocarbon-forming potential of type I rock.
The fitting relations of the type III, type II and type I organic matters are respectively as follows:
S1+S2＝109.82TOC-0.5；
S1+S2＝328.09TOC-0.5；
S1+S2＝747.21TOC-0.5；
wherein S1 is soluble hydrocarbon in a rock pyrolysis report, mg/g; s2 pyrolysis of hydrocarbons, mg/g.
Based on the relational expression, the organic carbon standard at 10% of oil drainage saturation is reasonable, and the lower limit standard of the organic carbon of the source rock at different depths can be obtained. When the source rock buried depth reaches 5000 meters and the organic matter is completely degraded, as can be seen from table 1, the organic carbon standard of type i source rock is 0.18%, the organic carbon standard of type ii source rock is 0.4%, and the organic carbon standard of type iii source rock is 1.1%.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (10)
1. A method for determining the lower limit of organic carbon of an effective hydrocarbon source rock is characterized by comprising the following steps:
s100: calculating the hydrocarbon content in the source rock when a certain depth reaches a critical saturation degree;
s200: calculating initial hydrocarbon generation potential;
s300: the desired organic carbon content in the source rock at the time of hydrocarbon expulsion was calculated.
2. The method for determining the lower organic carbon limit of an effective hydrocarbon source rock according to claim 1, wherein the step of S200 calculating the initial hydrocarbon generation potential comprises:
calculating the conversion rate of the corresponding organic matter into hydrocarbon according to the depth; then, the initial hydrocarbon generation potential is calculated from the hydrocarbon content required during the hydrocarbon discharge according to the conversion rate.
3. The method of claim 2, wherein the step of S300 calculating the required organic carbon content in the source rock for expulsion of hydrocarbons comprises:
and (3) making a correlation graph of the hydrocarbon generation potential and the organic carbon content TOC according to rock pyrolysis data to obtain a fitting relational expression of the hydrocarbon generation potential and the organic carbon content TOC of different types of hydrocarbon source rocks, and calculating the organic carbon content required by the source rocks when the hydrocarbon is discharged at different depths according to the fitting relational expression.
4. The method for determining the lower organic carbon limit of an effective source rock according to claim 1, comprising the steps of:
s100: calculating the hydrocarbon content in the source rock when a certain depth reaches a critical saturation degree;
s200: calculating the initial hydrocarbon generation potential:
calculating the conversion rate of the corresponding organic matter into hydrocarbon according to the depth; then, according to the conversion rate, calculating the initial hydrocarbon generation potential by the content of the hydrocarbon required during hydrocarbon discharge;
s300: calculating the required organic carbon content in the source rock when discharging hydrocarbons:
and (3) making a correlation graph of the hydrocarbon generation potential and the organic carbon content TOC according to rock pyrolysis data to obtain a fitting relational expression of the hydrocarbon generation potential and the organic carbon content TOC of different types of hydrocarbon source rocks, and calculating the organic carbon content required by the source rocks when the hydrocarbon is discharged at different depths according to the fitting relational expression.
5. The method for determining the lower organic carbon limit of an effective source rock according to any one of claims 1 to 4, wherein the research premise of the method comprises the following 4-point hypothesis:
1) mudstone porosity decreases with depth;
2) the primary migration phase is a continuous oil phase and the critical saturation is 10 percent;
3) assuming that the available carbon is all degrading the raw hydrocarbons;
4) the source rock adsorbs a certain amount of hydrocarbons per unit volume.
6. The method for determining the lower limit of the effective organic carbon of the source rock according to claim 5, wherein in S100, the formula of the hydrocarbon content in the source rock when the critical saturation is reached at a certain depth per unit volume of the source rock during initial deposition is as follows:
the data in the formula are determined according to the actual measurement result: HCRock-total hydrocarbon content of rock, mg/g;
V0initial source rock massVolume, cm3；
Srow board-critical saturation of oil discharge,%;
ρhydrocarbonsDensity of hydrocarbon fluid, mg/cm3；
ρRock (A. B. EDensity of source rock in mg/cm3；
S1-soluble hydrocarbons in rock pyrolysis report, mg/g.
7. The method for determining the lower limit of organic carbon in effective source rock according to claim 6, wherein in S200, the formula of the conversion rate and the depth change of organic matters in the source rock at a certain moment in the process of the geological history is as follows:
＜3000m：y＝405.68ln(x)+3253.2；
≥3000m：y＝21261x2-29263x+12969；
wherein x is the conversion, i.e. the total hydrocarbon yield, mg/g; y is depth, m.
8. The method for determining the lower limit of organic carbon in effective source rock according to claim 7, wherein in S300, the fitting relations between the hydrocarbon generation potential and the organic carbon content TOC of the type III, type II and type I source rock are respectively as follows:
S1+S2＝109.82TOC-0.5；
S1+S2＝328.09TOC-0.5；
S1+S2＝747.21TOC-0.5；
wherein S1 is soluble hydrocarbon in a rock pyrolysis report, mg/g; s2 pyrolysis of hydrocarbons, mg/g.
9. The method for determining the lower organic carbon limit of an effective source rock according to claim 5, comprising the steps of:
s100: calculating the hydrocarbon content in the source rock when a certain depth reaches a critical saturation degree;
the formula of the hydrocarbon content in the source rock when the unit volume of the source rock reaches the critical saturation at a certain depth during initial deposition is as follows:
the data in the formula are determined according to the actual measurement result: HCRock-total hydrocarbon content of rock, mg/g;
V0initial Source rock volume, cm3；
Srow board-critical saturation of oil discharge,%;
ρhydrocarbonsDensity of hydrocarbon fluid, mg/cm3；
ρRock (A. B. EDensity of source rock in mg/cm3；
S1-soluble hydrocarbons in rock pyrolysis report, mg/g;
s200: calculating the initial hydrocarbon generation potential:
calculating the conversion rate of the corresponding organic matter into hydrocarbon according to the depth; then, according to the conversion rate, calculating the initial hydrocarbon generation potential by the content of the hydrocarbon required during hydrocarbon discharge;
the formula of the conversion rate and the depth change of organic matters in the source rock at a certain moment in the process of the geological history is as follows:
＜3000m：y＝405.68ln(x)+3253.2；
≥3000m：y＝21261x2-29263x+12969；
wherein x is the conversion, i.e. the total hydrocarbon yield, mg/g; y is depth, m;
s300: calculating the required organic carbon content in the source rock when discharging hydrocarbons:
the hydrocarbon generation potentials of different types of hydrocarbon source rocks are different, a correlation graph of the hydrocarbon generation potential and the organic carbon content TOC is made according to rock pyrolysis data, a fitting relational expression of the hydrocarbon generation potential and the organic carbon content TOC of the different types of hydrocarbon source rocks is obtained, and the organic carbon content required in the source rocks when the various types of hydrocarbon source rocks discharge hydrocarbons at different depths is calculated according to the fitting relational expression;
fitting relations of hydrocarbon generation potential and organic carbon content TOC of type III, type II and type I hydrocarbon source rocks are respectively as follows:
S1+S2＝109.82TOC-0.5；
S1+S2＝328.09TOC-0.5；
S1+S2＝747.21TOC-0.5；
wherein S1 is soluble hydrocarbon in a rock pyrolysis report, mg/g; s2 pyrolysis of hydrocarbons, mg/g.
10. A method for determining the lower limit of organic carbon in an effective source rock as claimed in claim 8 or 9, wherein at a depth of 5000m, the 10% drainage saturation requires the following organic carbon:
type I: 0.18 percent;
type II: 0.4 percent;
type III: 1.1 percent.
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