CN112782778A - Method and device for determining development of hydrocarbon source rock in saline environment of carbonate rock plateau - Google Patents
Method and device for determining development of hydrocarbon source rock in saline environment of carbonate rock plateau Download PDFInfo
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Abstract
The application discloses a method and a device for determining the development of a hydrocarbon source rock in a salinization environment of a carbonate rock plateau, wherein the method comprises the following steps: acquiring logging information of a single well and environmental parameters of a salty environment rock layer section of a carbonate rock platform where the single well is located, wherein the environmental parameters comprise ancient seawater salinity, an ancient climate type and a sedimentation environment type; inputting the logging information into a TOC calculation model, and calculating the TOC of the organic carbon content of the rock interval where the single well is located; and if the TOC is in the preset TOC range and the environmental parameters meet the development conditions of the source rocks, determining that the source rocks are developed in the rock interval where the single well is located. The method and the device can accurately and objectively determine whether the hydrocarbon source rock is developed in the salinization environment of the carbonate bedrock.
Description
Technical Field
The application relates to the technical field of oil and gas exploration, in particular to a method and a device for determining development of a hydrocarbon source rock in a salinization environment of a carbonate rock platform.
Background
This section is intended to provide a background or context to the embodiments of the invention that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.
Whether the carbonate plateau salinization environment can develop into effective hydrocarbon source rocks with a certain scale or not is one of the key problems restricting the evaluation of the marine basin carbonate rock-gypsum rock combination field in China. Although some effective source rocks are found in sediments in the evaporation plateau, the distribution rule and the distribution scale are unclear, and how to objectively evaluate whether the salty environment of the carbonate plateau develops the source rocks is a key geological problem faced by the current oil and gas exploration.
Disclosure of Invention
The embodiment of the application provides a method for determining the development of a source rock in a salinized carbonate rock tableland environment, which is used for accurately and objectively determining whether the source rock is developed in the salinized carbonate rock tableland environment or not, and comprises the following steps:
acquiring logging information of a single well and environmental parameters of a salty environment rock layer section of a carbonate rock platform where the single well is located, wherein the environmental parameters comprise ancient seawater salinity, an ancient climate type and a sedimentation environment type; inputting the logging information into a Total Organic Carbon (TOC) calculation model, and calculating the TOC of the rock interval where the single well is located; and if the TOC is in the preset TOC range and the environmental parameters meet the development conditions of the source rocks, determining that the source rocks are developed in the rock interval where the single well is located.
The embodiment of the application provides a carbonate rock platform area salt ization environment source rock development confirming device for whether hydrocarbon source rock has been developed in accurate, objective definite carbonate rock platform area salt ization environment, the device includes:
the system comprises an acquisition module, a storage module and a control module, wherein the acquisition module is used for acquiring logging information of a single well and environmental parameters of a salinization environment rock layer section of a carbonate rock platform where the single well is located, and the environmental parameters comprise ancient seawater salinity, an ancient climate type and a sedimentation environment type; the determining module is used for determining the rock lithology of the rock interval where the single well is located according to the logging information acquired by the acquiring module; the calculation module is used for inputting the logging information into a TOC calculation model of the organic carbon content corresponding to the rock lithology determined by the determination module, calculating the TOC of the rock layer section where the single well is located, and determining the TOC calculation model according to the correlation between the logging information and the TOC; the determining module is further used for determining that the hydrocarbon source rock is developed in the rock interval where the single well is located when the TOC calculated by the calculating module is within the preset TOC range and the environmental parameters acquired by the acquiring module meet the hydrocarbon source rock development conditions.
In the embodiment of the application, the TOC is calculated by utilizing the logging information and the TOC calculation model, and the TOC calculation result is constrained by the environmental parameters and the hydrocarbon source rock development conditions corresponding to the environmental parameters, so that the evaluation result of whether the carbonate rock plateau salinization environment develops the hydrocarbon source rock is obtained. The evaluation result is accurate and objective, and provides reliable basis for oil and gas exploration.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts. In the drawings:
FIG. 1 is a flow chart of a method for determining the development of a source rock in a salination environment of a carbonate rock plateau according to an embodiment of the present application;
FIG. 2 is a graph showing the TOC measurements of different lithological rocks in the example of the present application;
FIG. 3(a) is a diagram illustrating modeling results between TOC and well log GR in an embodiment of the present application;
FIG. 3(b) is a graph showing the modeling result between TOC and log lgRT in the embodiment of the present application;
FIG. 3(c) is a graph showing the modeling result between TOC and well log value AC in the embodiment of the present application;
FIG. 4 is a schematic diagram illustrating a correlation between a TOC measured value and a predicted value in an embodiment of the present application;
FIG. 5 is a diagram illustrating the relationship between TOC and Z in an embodiment of the present application;
FIG. 6 is a graph showing the relationship between TOC and Sr/Ba in the present embodiment;
FIG. 7 is a graph showing the relationship between TOC and Sr/Cu in the examples of the present application;
FIG. 8(a) is a graph showing the relationship between TOC and rock salt content in the examples of the present application;
FIG. 8(b) is a graph showing the relationship between TOC and gypsum content in the examples of the present application;
FIG. 9 is a diagram illustrating the relationship between TOC and V/(V + Ni) in the embodiment of the present application;
fig. 10 is a schematic structural diagram of a device for determining the development of a source rock in a saline environment of a carbonate rock plateau in an embodiment of the present application.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present application more apparent, the embodiments of the present application are further described in detail below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present application are provided herein to explain the present application and not to limit the present application.
The embodiment of the application provides a method for determining the development of a source rock in a salinization environment of a carbonate rock plateau, as shown in fig. 1, the method comprises steps 101 to 104:
Wherein the environmental parameters include the ancient seawater salinity, the ancient climate type and the sedimentation environment type.
In fact, the TOC change is influenced by various factors, in addition to lithology, also by various factors such as ancient seawater salinity, ancient climate conditions and sediment environment, and the judgment result of judging whether hydrocarbon source rocks are developed in the carbonate plateau salinization environment by only depending on the logging information may have errors, so that parameters such as the ancient seawater salinity are also needed to restrict the judgment result. Therefore, in the embodiment of the application, the logging information of a single well and the environmental parameters of the salty environmental rock interval of the carbonate rock bench where the single well is located are obtained simultaneously.
And 102, determining the rock lithology of the rock interval where the single well is located according to the logging information.
Lithology refers to some property that reflects a characteristic of rock, such as color, composition, structure, cement, type of cement or a particular mineral. For example, the shabbick section seideike group presents rocks of several lithologies: light grey dolostone, dark grey dolostone, grey argillaceous dolostone, and the like.
And 103, inputting the logging information into a TOC calculation model corresponding to rock lithology, and calculating the TOC of the organic carbon content of the rock interval where the single well is located.
The TOC calculation model is determined according to the incidence relation between the logging data and the TOC, and is obtained according to the following method:
determining well log data of the rock developing the source rock through the collected rock sample; determining the associated logging parameters associated with the TOC in the logging information of each lithologic rock by using regression analysis according to different lithologies of the rock; and respectively determining a TOC calculation model for calculating TOC by using the associated logging parameters of each lithologic rock by using multivariate regression analysis.
For example, in the embodiment of the present application, systematic sampling was performed on 1 outcrop section and 4 wells of the Tarim basin and 12 wells of the Ordos basin, and TOC of different lithologic rocks was determined, the determination results are shown in fig. 2 and the following table, and the minimum value, the average value and the maximum value of TOC of four different lithologic rocks, such as dolomite, limestone, gypsum mudstone and saliferous dolomite, are shown in fig. 2; the lithology of the rocks at the different horizons of the shore braker profile and the corresponding TOC are shown in table one. From table one and fig. 2, the TOC of the salty dolomites and muddy dolomites was relatively high.
Watch 1
Because the time that need consume through the TOC of rock sample survey rock is longer and the operation flow is comparatively complicated, in order can be convenient, swift confirm the TOC, in this application embodiment, established the incidence relation between logging information and the TOC to can directly calculate the TOC through logging information.
Specifically, for 53 log values of dolostone and mud/argillaceous dolostone, TOC modeling is performed on each log value respectively. Fig. 3(a), 3(b) and 3(c) show exemplary modeling results between TOC and log values GR, lgRt, AC, from which it can be seen that the correlation coefficient of TOC and GR is R20.559, correlation coefficient with lgRt is R20.1543, the correlation is better, and the correlation coefficient with AC is R2The correlation is poor at 0.0742. Therefore, GR and lgRt were chosen as the associated logging parameters associated with the TOC.
After determining the relevant logging parameters of the TOC, performing multivariate regression analysis according to the TOC and the relevant logging parameters GR and lgRt to obtain a TOC calculation model:
TOC＝0.0081GR+0.1003(lgRt)-0.0166
as shown in FIG. 4, the correlation coefficient R between the TOC measured value and the predicted value20.6498, it can be seen that the model matching relationship is good for this TOC calculation, and a single well TOC can be calculated using this model.
It should be noted that, the above calculation model is for one lithologic rock, and for other lithologic rocks, the TOC calculation model needs to be re-established, that is, different lithologic rocks correspond to different TOC calculation models.
And step 104, if the TOC is in the preset TOC range and the environmental parameters meet the development conditions of the source rocks, determining that the source rocks are developed in the rock interval where the single well is located.
Wherein the preset TOC range is TOC > 0.5%.
The environmental parameters include paleo-sea water salinity, paleo-climate conditions and deposition environment. The hydrocarbon source rock development conditions corresponding to the ancient seawater salinity comprise: the Z value is in a first preset range; alternatively, the value of Sr/Ba is within a second predetermined range; wherein, the Z value and the Sr/Ba value can be used for reflecting the ancient seawater salinity during deposition. The hydrocarbon source rock development conditions corresponding to the paleo-climate type include: the ancient climate type is warm and humid; and when the Sr/Cu value of the rock is in a third preset range, the ancient climate type of the rock is a warm humid climate. The hydrocarbon source rock development conditions corresponding to the type of depositional environment include: the deposition environment type is a weak reduction environment; and when the value of V/(V + Ni) of the rock is in a fourth preset range, the type of the deposition environment in which the rock is located is a weak reduction environment.
The determination method of the above three kinds of source rock development conditions will be described below.
1. Salinity of ancient seawater
The first predetermined range of Z values is determined by carbon-oxygen isotope method. Specifically, a carbon-oxygen isotope method is utilized to calculate the Z value of a rock sample of a rock interval where a single well is located to be measured, the TOC of the same rock sample is measured, the Z value and the TOC measured by the same rock sample are used as a group of data, and multiple groups of data can be measured by different rock samples; and determining a Z value range when the TOC is in a preset TOC range according to the Z value and the TOC measured by different rock samples, wherein the Z value range is used as a first preset range. That is, the Z value and the TOC value measured for the same rock sample are used as a set of point coordinates, and the Z value and the TOC value measured for a plurality of sets of rock samples can form a plurality of sets of point coordinates, as shown in fig. 5, the plurality of sets of point coordinates are marked in a coordinate system, so that the Z value range when the TOC is within the preset TOC range can be determined.
From the statistical results of the rock samples, the degree of development of the source rock is related to the seawater salinity during the sedimentation period (i.e., the paleo-seawater salinity). As shown in fig. 5, which is a graph of the relationship between TOC and Z value, the abscissa of fig. 5 represents Z value calculated using a carbon-oxygen isotope, and the ordinate represents sample TOC, it can be seen that TOC shows a tendency of rising first and then falling as the Z value increases. The rock sample measurements given by way of example in FIG. 5 show that organic matter is most enriched with TOC > 0.5% when the Z value is between 122.5 and 125. This reflects that the brackish water environment is conducive to biological bloom, when the seawater salinity is too high, it is not conducive to biological survival, and the species and total amount of organisms are reduced, resulting in a reduction in TOC.
The second predetermined range of Sr/Ba values is determined by trace element analysis. Specifically, calculating the Sr/Ba value of a rock sample of a rock interval where a single well is positioned to be measured by using a trace element analysis method, and measuring the TOC of the same rock sample; and determining the range of the Sr/Ba value when the TOC is in the preset TOC range as a second preset range according to the Sr/Ba value and the TOC measured by different rock samples. As shown in fig. 6, the Sr/Ba value and TOC measured for the same rock sample are taken as a point coordinate, and the collected multiple rock samples are measured to obtain a plurality of Sr/Ba values and TOC composed point coordinates, and as shown in fig. 6, the point coordinates are expressed in a coordinate system, so that the range of Sr/Ba values when TOC is within the preset TOC range can be determined.
It is generally believed that when Sr/Ba is greater than 1, the salty water environment is reacted, and the greater the ratio, the higher the salinity of the water body. The rock sample measurements given in the example of fig. 6 show that the Sr/Ba ratio for samples with TOC greater than 0.5 is concentrated in the interval 1-4, mainly slightly above the salinity range of normal seawater.
It should be noted that, the environments of different areas are different, so that the first preset range and the second preset range are also different, and the first preset range and the second preset range used in each area need to be determined by measuring parameters of the rock sample collected in the current area.
2. Ancient climate conditions
The third predetermined range of Sr/Cu values is determined by trace element analysis. Specifically, calculating the Sr/Cu value of a rock sample by using a trace element analysis method, and determining the TOC of the same rock sample; and determining the range of the Sr/Cu value when the TOC is in the preset TOC range according to the Sr/Cu value measured by different rock samples as a third preset range. Similarly to when determining the range of Z values and the range of Sr/Ba values, as shown in fig. 7, by plotting Sr/Cu values and TOC values in a coordinate system, the range of Sr/Cu values when TOC is within a preset TOC range can be determined.
Taking a certain area in FIG. 7 as an example, when Sr/Cu is more than 10, the evaporation effect is strong in hot and arid climates; when Sr/Cu is less than 10, the climate is relatively warm and humid, and the evaporation effect is weaker. As can be seen from the relationship of TOC to Sr/Cu shown in FIG. 7, Sr/Cu is inversely related to TOC, i.e., high TOC corresponds to low Sr/Cu. It can be seen that a relatively warm humid climate, a weak evaporation environment, is more favorable for formation of source rock than a hot dry climate, a strong evaporation environment, which has a higher organic carbon content.
In consideration of the difference in environment between the different regions, it is necessary to measure the third preset range used for each region.
3. Deposition environment
The fourth predetermined range of values of V/(V + Ni) is determined by trace element analysis. Specifically, a trace element analysis method is utilized to calculate the value of V/(V + Ni) of a rock sample, and the TOC of the same rock sample is determined; from the values of V/(V + Ni) and TOC determined for different rock samples, a range of values of V/(V + Ni) when TOC is within the preset TOC range is determined as a fourth preset range. Similarly to when determining the Z value range, the Sr/Ba value range, and the Sr/Cu value range, by plotting the V/(V + Ni) value and the TOC value in the coordinate system as shown in fig. 9, the range of V/(V + Ni) values when the TOC is within the preset TOC range can be determined.
In the embodiment of the application, a trace element analysis method is used for establishing the relationship between the deposition environment and the TOC response. As shown in fig. 8(a) and 8(b), the high TOC sample has a positive correlation with the content of salt rock and a negative correlation with the content of gypsum, because the water body in the gypsum deposition environment is unstable and is an oxidizing or weakly reducing environment, while the water body in the salt rock deposition environment is stable and is a reducing environment. Therefore, the reduction environment is more beneficial to organic matter preservation.
V/(V + Ni) can reflect the degree of oxidation-reduction of the water body, and taking a certain region shown in FIG. 9 as an example, when V/(V + Ni) is greater than 0.84, an anaerobic environment is obtained, and when V/(V + Ni) is between 0.6 and 0.8, an oxygen-deficient environment is obtained. FIG. 9 shows that samples V/(V + Ni) with TOC greater than 0.5 are generally greater than 0.7, reflecting a weak reduction-reduction environment overall.
Likewise, a fourth predetermined range used in a different zone requires actual measurements to be made through the rock sample in that zone.
Through the comprehensive analysis, the development section of the hydrocarbon source rock is calculated by using logging information, and the ancient seawater salinity, the ancient climate condition and the oxidation-reduction environment information are obtained by using stable isotopes and normal trace elements and are used for constraining the logging interpretation result, so that the evaluation result of whether the carbonate rock plateau salinization environment develops the hydrocarbon source rock is obtained.
In the embodiment of the application, the TOC is calculated by utilizing the logging information and the TOC calculation model, and the TOC calculation result is constrained by the environmental parameters and the hydrocarbon source rock development conditions corresponding to the environmental parameters, so that the evaluation result of whether the carbonate rock plateau salinization environment develops the hydrocarbon source rock is obtained. The evaluation result is accurate and objective, and provides reliable basis for oil and gas exploration.
The embodiment of the application provides a device for determining the development of a source rock in a saline environment of a carbonate rock platform, and as shown in fig. 10, the device 1000 includes an obtaining module 1001, a determining module 1002 and a calculating module 1003.
The obtaining module 1001 is configured to obtain logging information of a single well and environmental parameters of a salty environment rock interval of a carbonate rock bench where the single well is located, where the environmental parameters include ancient seawater salinity, ancient climate types, and sedimentation environment types.
The determining module 1002 is configured to determine rock lithology of a rock interval where the single well is located according to the logging information acquired by the acquiring module 1001.
The calculation module 1003 is configured to input the logging information into a TOC calculation model of organic carbon content corresponding to the rock lithology determined by the determination module 1002, calculate a TOC of a rock interval where the single well is located, and determine the TOC calculation model according to the correlation between the logging information and the TOC.
The determining module 1002 is further configured to determine that a hydrocarbon source rock is developed in a rock interval where the single well is located when the TOC calculated by the calculating module 1003 is within the preset TOC range and the environmental parameter acquired by the acquiring module 1001 meets a hydrocarbon source rock development condition.
In one implementation manner of the embodiment of the present application, the apparatus 1000 further includes:
a determination module 1004 for determining well logs of rock that developed the source rock from the collected rock samples.
The determining module 1002 is configured to determine, according to different lithologies of the rock, associated logging parameters associated with the TOC in the logging information of each lithology rock by using regression analysis.
The determining module 1002 is further configured to determine a TOC calculation model for calculating TOC using the associated logging parameters of each lithologic rock, respectively, by using multiple regression analysis.
In one implementation of the embodiment of the present application, the hydrocarbon source rock development conditions corresponding to the ancient seawater salinity include: the Z value is in a first preset range and is used for reflecting the salinity of the ancient seawater during deposition; alternatively, the value of Sr/Ba is in a second preset range, and the value of Sr/Ba is used for reflecting the ancient seawater salinity during sedimentation.
In an implementation manner of the embodiment of the present application, the obtaining module 1001 determines the first preset range by the following method:
calculating the Z value of the rock sample of the rock interval where the single well is positioned by utilizing a carbon-oxygen isotope method, and determining the TOC of the same rock sample; and determining a Z value range when the TOC is in a preset TOC range according to the Z value and the TOC measured by different rock samples, wherein the Z value range is used as a first preset range.
In an implementation manner of the embodiment of the present application, the obtaining module 1001 determines the second preset range by the following method:
calculating the Sr/Ba value of the rock sample of the rock interval where the single well is positioned by utilizing a trace element analysis method, and determining the TOC of the same rock sample; and determining the range of the Sr/Ba value when the TOC is in the preset TOC range as a second preset range according to the Sr/Ba value and the TOC measured by different rock samples.
In one implementation of the embodiment of the present application, the hydrocarbon source rock development conditions corresponding to the paleo-climate type include: the Sr/Cu value of the rock is in a third preset range, and the Sr/Cu value is used for reflecting the ancient climate type of the rock.
In an implementation manner of the embodiment of the present application, the obtaining module 1001 determines the third preset range by the following method:
calculating the Sr/Cu value of the rock sample of the rock interval where the single well is positioned by utilizing a trace element analysis method, and determining the TOC of the same rock sample; and determining the range of the Sr/Cu value when the TOC is within the preset TOC range according to the Sr/Cu value and the TOC measured by different rock samples as a third preset range.
In one implementation of the embodiments of the present application, the source rock development conditions corresponding to the type of depositional environment include: the deposition environment type is a weak reduction environment; and when the value of V/(V + Ni) of the rock is in a fourth preset range, the type of the deposition environment in which the rock is located is a weak reduction environment.
In an implementation manner of the embodiment of the present application, the obtaining module 1001 determines the fourth preset range by the following method:
calculating the value of V/(V + Ni) of the rock sample of the rock interval where the single well is positioned by utilizing a trace element analysis method, and determining the TOC of the same rock sample; from the values of V/(V + Ni) and TOC determined for different rock samples, a range of values of V/(V + Ni) when TOC is within the preset TOC range is determined as a fourth preset range.
In one implementation of the embodiments of the present application, the predetermined TOC range is > 0.5% TOC.
In the embodiment of the application, the TOC is calculated by utilizing the logging information and the TOC calculation model, and the TOC calculation result is constrained by the environmental parameters and the hydrocarbon source rock development conditions corresponding to the environmental parameters, so that the evaluation result of whether the carbonate rock plateau salinization environment develops the hydrocarbon source rock is obtained. The evaluation result is accurate and objective, and provides reliable basis for oil and gas exploration.
The embodiment of the present application further provides a computer device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the processor implements any one of steps 101 to 104 and various implementation manners thereof.
An embodiment of the present application further provides a computer-readable storage medium, in which a computer program for executing any one of the methods in step 101 to step 104 is stored.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above-mentioned embodiments are further described in detail for the purpose of illustrating the invention, and it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (13)
1. A method for determining the development of carbonate source rock in a salinized environment of a plateau, which comprises the following steps:
acquiring logging information of a single well and environmental parameters of a salty environment rock layer section of a carbonate rock platform where the single well is located, wherein the environmental parameters comprise ancient seawater salinity, an ancient climate type and a sedimentation environment type;
determining the rock lithology of the rock interval where the single well is located according to the logging information;
inputting logging information into a TOC (organic carbon content) calculation model corresponding to rock lithology, and calculating the TOC of a rock interval where a single well is located, wherein the TOC calculation model is determined according to the incidence relation between the logging information and the TOC;
and if the TOC is in the preset TOC range and the environmental parameters meet the development conditions of the source rocks, determining that the source rocks are developed in the rock interval where the single well is located.
2. The method of claim 1, wherein prior to entering well log data into the TOC calculation model for organic carbon content corresponding to rock lithology, the method further comprises:
determining well log data of the rock developing the source rock through the collected rock sample;
determining the associated logging parameters associated with the TOC in the logging information of each lithologic rock by using regression analysis according to different lithologies of the rock;
and respectively determining a TOC calculation model for calculating TOC by using the associated logging parameters of each lithologic rock by using multivariate regression analysis.
3. The method of claim 1, wherein the source rock development conditions corresponding to paleo-seawater salinity comprise: the Z value is in a first preset range and is used for reflecting the salinity of the ancient seawater during sedimentation; alternatively, the value of Sr/Ba is in a second preset range, and the value of Sr/Ba is used for reflecting the ancient seawater salinity during sedimentation.
4. The method of claim 3, wherein the first predetermined range is determined by:
calculating the Z value of the rock sample of the rock interval where the single well is positioned by utilizing a carbon-oxygen isotope method, and determining the TOC of the same rock sample; and determining the range of the Z value when the TOC is in the preset TOC range according to the Z value and the TOC measured by different rock samples as a first preset range.
5. A method according to claim 3, wherein the second predetermined range is determined by:
calculating the Sr/Ba value of the rock sample of the rock interval where the single well is positioned by utilizing a trace element analysis method, and determining the TOC of the same rock sample; and determining the range of the Sr/Ba value when the TOC is in the preset TOC range as a second preset range according to the Sr/Ba value and the TOC measured by different rock samples.
6. The method of claim 1, wherein the hydrocarbon source rock development conditions corresponding to the paleo-climate type comprise: the Sr/Cu value of the rock is in a third preset range, and the Sr/Cu value is used for reflecting the ancient climate type of the rock.
7. The method of claim 6, wherein the third predetermined range is determined by:
calculating the Sr/Cu value of the rock sample of the rock interval where the single well is positioned by utilizing a trace element analysis method, and determining the TOC of the same rock sample; and determining the range of the Sr/Cu value when the TOC is within the preset TOC range according to the Sr/Cu value and the TOC measured by different rock samples as a third preset range.
8. The method of claim 1, wherein the source rock development conditions corresponding to a type of depositional environment comprise: the deposition environment type is a weak reduction environment; and when the value of V/(V + Ni) of the rock is in a fourth preset range, the type of the deposition environment in which the rock is located is a weak reduction environment.
9. The method of claim 8, wherein the fourth predetermined range is determined by:
calculating the value of V/(V + Ni) of the rock sample of the rock interval where the single well is positioned by utilizing a trace element analysis method, and determining the TOC of the same rock sample; from the values of V/(V + Ni) and TOC determined for different rock samples, a range of values of V/(V + Ni) when TOC is within the preset TOC range is determined as a fourth preset range.
10. The method of any one of claims 1 to 9, wherein the predetermined TOC range is a TOC > 0.5%.
11. A carbonate bench salty environment source rock development determining apparatus, the apparatus comprising:
the system comprises an acquisition module, a storage module and a control module, wherein the acquisition module is used for acquiring logging information of a single well and environmental parameters of a salinization environment rock layer section of a carbonate rock platform where the single well is located, and the environmental parameters comprise ancient seawater salinity, an ancient climate type and a sedimentation environment type;
the determining module is used for determining the rock lithology of the rock interval where the single well is located according to the logging information acquired by the acquiring module;
the calculation module is used for inputting the logging information into a TOC calculation model of the organic carbon content corresponding to the rock lithology determined by the determination module, calculating the TOC of the rock layer section where the single well is located, and determining the TOC calculation model according to the correlation between the logging information and the TOC;
the determining module is further used for determining that the hydrocarbon source rock is developed in the rock interval where the single well is located when the TOC calculated by the calculating module is within the preset TOC range and the environmental parameters acquired by the acquiring module meet the hydrocarbon source rock development conditions.
12. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of any one of claims 1 to 10 when executing the computer program.
13. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program for executing the method of any one of claims 1 to 10.
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