Method and device for determining hydrocarbon generation intensity of high overmature marine source rock

Abstract

The present application provides a method and device for determining the hydrocarbon generation intensity of high over mature marine source rock, which comprises: obtaining the original logging curve of the layer section of the target developed source rock; obtaining the organic carbon content of the source rock at different depths to generate the organic carbon content curve of the source rock; performing multiple regression analysis on the obtained original logging curve and the organic carbon content curve of the source rock to select the target logging curve; establishing the fitting formula of the organic carbon content of the source rock; constructing the fitting formula of the hydrocarbon generation amount of the source rock; and obtaining the high over mature marine source rock hydrocarbon generation intensity calculation formula by using the fitting formula of the organic carbon content of the source rock, the fitting formula of the hydrocarbon generation amount of the source rock, the logging data interval, and the source rock density corresponding to the source rock sample at different depths. The present application does not need to collect a large number of core samples, reduces the core sampling and analysis testing cost, and uses the cumulative method in the corrected calculation formula to avoid the artificial interference caused by the selection of the average number and increase the operability.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil and gas accumulation, and in particular relates to a method and device for determining the hydrocarbon generation intensity of highly over-mature marine source rocks. Background Art

[0002] Deep marine carbonate reservoirs hold enormous exploration potential and represent a key area of ​​oil and gas exploration in my country. Efficient and accurate calculation of the hydrocarbon generation intensity of highly mature marine source rocks is crucial for oil and gas resource evaluation and the selection of favorable zones. However, due to their deep burial depth and age, hydrocarbon generation potential evaluation parameters for highly mature marine source rocks are difficult to obtain, making efficient and accurate evaluation of their hydrocarbon generation intensity difficult. Summary of the Invention

[0003] The inventors discovered that the current method for calculating the hydrocarbon generation intensity of source rocks is to use the formula Q = H × C × ρ × HI, where H is the source rock thickness, C is the source rock organic carbon content (TOC), ρ is the source rock density, and HI is the source rock hydrogen index. During the calculation process, these parameters are mainly selected based on the average values ​​of the target layer parameters. However, due to the strong heterogeneity of source rocks, the hydrocarbon generation intensity calculated by calculating the average values ​​of each parameter is inaccurate and susceptible to human interference. Furthermore, obtaining these parameters for highly mature marine source rocks requires a large number of samples, which is time-consuming, expensive, and costly. Furthermore, the hydrogen index of highly mature marine source rocks is difficult to accurately obtain using experimental methods.

[0004] In view of this, it is necessary to establish a method that can efficiently and accurately evaluate the hydrocarbon generation intensity of highly overmature marine source rocks, which can provide a basis for oil and gas resource prediction and oil and gas zone optimization, and is of great significance to oil and gas exploration.

[0005] Specifically, the method for determining the hydrocarbon generation intensity of highly overmature marine source rocks proposed in the present invention comprises the following steps:

[0006] Obtain the target layer section where source rocks are developed and obtain the original logging curve of the layer section;

[0007] Obtain the source rock organic carbon content of source rock samples at different depths and generate a source rock organic carbon content curve;

[0008] Perform multiple regression analysis on the original well logging curves and the organic carbon content curves of the source rocks, and select the target well logging curve that meets the required correlation with the organic carbon content curves of the source rocks;

[0009] Fitting the target logging curve with the source rock organic carbon content of source rock samples obtained at different depths to establish a source rock organic carbon content fitting formula;

[0010] Using the preset maturity of source rocks, a fitting formula for source rock hydrocarbon generation is constructed;

[0011] Using the fitting formula of source rock organic carbon content, the fitting formula of source rock hydrocarbon generation amount, the logging data interval, and the source rock density corresponding to source rock samples at different depths, the hydrocarbon generation intensity of highly overmature marine source rocks is obtained according to the following formula:

[0012] Q=∑V TOC ×H×ρ×V HI

[0013] Where Q is the hydrocarbon generation intensity of highly over-mature marine source rocks, V TOC is the organic carbon content of source rock obtained by fitting the organic carbon content formula, V HI is the hydrocarbon generation capacity of source rock obtained by fitting the hydrocarbon generation capacity formula of source rock, ρ is the density of source rock corresponding to source rock samples at different depths, and H is the interval of well logging data.

[0014] Furthermore, the target layer section with source rock is obtained, and the original logging curve of the layer section is obtained, including:

[0015] Investigate the structural and sedimentary background of the target area, understand the development characteristics of the main lithologies in the target area, screen out the layers where source rocks are developed, and obtain the original logging curves of the layers.

[0016] Furthermore, the original logging curves include at least an acoustic wave curve, a natural gamma ray curve, a resistivity curve, and a density curve.

[0017] Furthermore, the target logging curve is fitted with the organic carbon content of source rock samples obtained at different depths to establish a fitting formula for the organic carbon content of the source rock, including:

[0018] The established fitting formula for the organic carbon content of source rocks is:

[0019] V TOC =ΣA i ×C i +B

[0020] Among them, V TOC The organic carbon content of source rock samples obtained at different depths, C i is the data of the i-th target logging curve, A i is the coefficient corresponding to the i-th logging curve, and B is the calculation parameter;

[0021] The organic carbon content of source rock samples at different depths and the data of target logging curves are used to obtain the coefficients and calculation parameters corresponding to the logging curves.

[0022] Furthermore, using the preset maturity of source rocks, a fitting formula for source rock hydrocarbon generation is constructed, including:

[0023] The fitting formula for hydrocarbon generation of source rocks is:

[0024] V HI =α×In(Ro)+β

[0025] Where Ro is the maturity of source rock, V HI is the hydrocarbon generation capacity of source rocks obtained by fitting the maturity of source rocks. α and β are calculation parameters obtained by comparing the maturity of source rocks and the hydrocarbon generation capacity of source rocks.

[0026] Furthermore, the maturity of the source rock is obtained by experimental testing or by depth fitting.

[0027] Furthermore, the logging curve data interval is 0.125m.

[0028] On the other hand, the present invention also proposes a device for determining the hydrocarbon generation intensity of highly overmature marine source rocks, comprising an original well logging curve acquisition module, an organic carbon content curve generation module, a target well logging curve screening module, a first formula establishment module, a second formula establishment module, and a hydrocarbon generation intensity calculation module, wherein:

[0029] The original logging curve acquisition module is used to obtain the target layer section where source rocks are developed and obtain the original logging curve of the layer section;

[0030] An organic carbon content curve generation module is used to obtain the organic carbon content of source rock samples at different depths and generate a source rock organic carbon content curve;

[0031] The target logging curve screening module is used to perform a multivariate regression analysis on the original logging curves obtained and the organic carbon content curves of the source rocks, and select the target logging curves that meet the required correlation with the organic carbon content curves of the source rocks;

[0032] The first formula establishment module is used to fit the target well logging curve with the source rock organic carbon content of source rock samples obtained at different depths, and establish a source rock organic carbon content fitting formula;

[0033] The second formula building module is used to construct a fitting formula for the hydrocarbon generation amount of the source rock using the preset maturity of the source rock;

[0034] The hydrocarbon generation intensity calculation module is used to calculate the hydrocarbon generation intensity of highly overmature marine source rocks using the fitting formula of source rock organic carbon content, the fitting formula of source rock hydrocarbon generation amount, the logging data interval, and the source rock density corresponding to source rock samples at different depths according to the following formula:

[0035] Q=∑V TOC×H×ρ×V HI

[0036] Where Q is the hydrocarbon generation intensity of highly over-mature marine source rocks, V TOC is the organic carbon content of source rock obtained by fitting the organic carbon content formula, V HI is the hydrocarbon generation capacity of source rock obtained by fitting the hydrocarbon generation capacity formula of source rock, ρ is the density of source rock corresponding to source rock samples at different depths, and H is the interval of well logging data.

[0037] In a third aspect, an embodiment of the present invention further discloses a computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the aforementioned method for determining the hydrocarbon generation intensity of highly overmature marine source rocks.

[0038] In a fourth aspect, based on the same inventive concept, an embodiment of the present invention further provides a computer-readable storage medium storing the aforementioned method for determining the hydrocarbon generation intensity of highly overmature marine source rocks.

[0039] Based on the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0040] The present invention utilizes logging data from well-developed source rock sections, combined with experimental and theoretical demonstrations to establish fitting formulas for source rock organic carbon content and source rock hydrocarbon generation, to obtain a revised formula for calculating the hydrocarbon generation intensity of highly overmature marine source rocks. The present invention does not require the collection of a large number of core samples, reducing the costs of core sampling and analytical testing. It can be used in areas with few wells and deep layers where core samples are difficult to obtain, thus improving the limitations of previous methods. The revised formula for calculating the hydrocarbon generation intensity of highly overmature marine source rocks also utilizes a cumulative method, avoiding human interference caused by parameter selection when averaging, thereby increasing operability. This method can be used to obtain hydrocarbon generation intensity data for each well location, draw maps of hydrocarbon generation intensity, and effectively support the optimization of favorable zones and the demonstration of risk targets. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0042] Figure 1 This is a flow chart of a method for determining the hydrocarbon generation intensity of highly over-mature marine source rocks in Example 1 of the present invention;

[0043] Figure 2Schematic diagram of fitting the original well logging curves and the organic carbon content curve of the source rock involved in step S130 in embodiment 1 of the present invention;

[0044] Figure 3 Schematic diagram of obtaining a fitting calculation formula for source rock TOC content by fitting the natural gamma curve GR and the acoustic curve AC as target logging curves with the source rock organic carbon content curve in step S140 in Example 1 of the present invention;

[0045] Figure 4 Schematic diagram of the experimental results showing a logarithmic relationship between hydrocarbon generation conversion rate and maturity of source rocks in Example 1 of the present invention;

[0046] Figure 5 This is a schematic structural diagram of a device for determining the hydrocarbon generation intensity of highly overmature marine source rocks in Example 2 of the present invention. DETAILED DESCRIPTION

[0047] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0048] Example 1

[0049] The present invention proposes a method for efficiently and accurately evaluating the hydrocarbon generation intensity of highly over-mature marine source rocks, which provides a basis for oil and gas resource prediction and oil and gas zone optimization, and is of great significance to oil and gas exploration. Figure 1 As shown, the method for determining the hydrocarbon generation intensity of highly overmature marine source rocks includes steps S110 to S160, specifically:

[0050] Step S110: obtaining a target layer segment where source rocks are developed and obtaining an original well logging curve of the layer segment.

[0051] In practical applications, we first investigate the structure and sedimentary background of the target area, understand the development characteristics of the main lithologies in the target area, screen out the layers where source rocks develop, and obtain the acoustic wave curves, natural gamma curves, resistivity curves, density curves and other logging curves of the layers.

[0052] Step S120 , obtaining the source rock organic carbon content of source rock samples at different depths, and generating a source rock organic carbon content curve.

[0053] The source rock organic carbon content (which can be recorded as TOC content) of a certain amount of source rock samples at different depths can be obtained through experimental testing to generate a source rock organic carbon content curve.

[0054] Step S130 , performing a multivariate regression analysis on the original well logging curve obtained and the organic carbon content curve of the source rock, and selecting a target well logging curve that meets the required correlation with the organic carbon content curve of the source rock.

[0055] Using the logging curves obtained in step S110, a multivariate regression analysis is performed on each logging curve and the TOC content curve generated in step S120, and each logging curve is fitted with the TOC content curve to obtain the correlation between each logging curve and the TOC content curve. The logging curve with a good correlation with the TOC content curve is preferred, and the selected multiple logging curves are used as target logging curves.

[0056] In some embodiments, the well logging curves having a correlation with the TOC content curve greater than 0.5 are selected as well logging curves, such as Figure 2 In the natural gamma curve GR (correlation R 2 is 0.6464), acoustic wave curve AC (correlation R 2 is 0.6118) as the target logging curve.

[0057] Step S140 , fitting the target well logging curve with the source rock organic carbon content of source rock samples obtained at different depths, and establishing a source rock organic carbon content fitting formula.

[0058] Specifically, the established fitting formula for the organic carbon content of source rocks can be:

[0059] V TOC =ΣA i ×C i + B (1)

[0060] Among them, V TOC The organic carbon content of source rock samples obtained at different depths, C i is the data of the i-th target logging curve, A i The coefficient A corresponding to the i-th logging curve can be obtained by using the organic carbon content of source rock samples at different depths and the data of the target logging curve. i , calculate parameter B.

[0061] Specifically, such as Figure 2 As shown, assuming that the natural gamma curve GR and the acoustic curve AC in the figure are used as target logging curves, the natural gamma curve GR and the acoustic curve AC are fitted with the TOC content obtained in the experiment, and combined with formula (1), the fitting calculation formula (2) for the TOC content of the source rock in the current embodiment is obtained, and then the coefficients a and b corresponding to the logging curve are calculated, and the value of the parameter c is calculated.

[0062] V TOC = a×AC + b×GR + c (2)

[0063] Wherein, AC is the acoustic curve data, GR is the natural gamma curve, both of which are obtained from well logging data. The fitting calculation formula for the TOC content of the source rock obtained in this embodiment is as follows: Figure 3 As shown in formula (3), we get a=0.0648,b=0.0155,c=4.1463:

[0064] V TOC = 0.0648×AC + 0.0155×GR - 4.1463 (3)

[0065] Step S150: constructing a fitting formula for hydrocarbon generation of source rocks using the preset maturity of source rocks.

[0066] After a large number of experimental simulations, the inventors found that the hydrocarbon conversion rate of source rocks is in a logarithmic relationship with maturity, and therefore the hydrocarbon production of source rocks is in a logarithmic relationship with maturity (e.g. Figure 4 As shown in Figure 4), the maturity of the source rock can be used to fit the corresponding hydrocarbon generation amount of the source rock, and the hydrocarbon generation amount calculation formula (4) can be obtained:

[0067] V HI =α× In(Ro) +β (4)

[0068] Where Ro is the maturity of source rock, V HI The hydrocarbon generation capacity of the source rock is obtained by fitting the source rock maturity. α and β are calculation parameters obtained by comparing the maturity and hydrocarbon generation capacity of the source rock. The maturity of the source rock, Ro, can be obtained through experimental testing or fitted using depth. The inventors have discovered that maturity is positively correlated with depth and low-temperature gradient. The geothermal gradient of a given area is generally available, so depth can be used to fit the corresponding maturity.

[0069] Step S160: Using the fitting formula of the organic carbon content of the source rock, the fitting formula of the hydrocarbon generation amount of the source rock, the interval of the well logging data, and the density of the source rock corresponding to the source rock samples at different depths, the hydrocarbon generation intensity of the highly overmature marine source rock is obtained according to the following formula:

[0070] Q=∑V TOC ×H×ρ× V HI (5)

[0071] Where Q is the hydrocarbon generation intensity of highly over-mature marine source rocks, V TOC is the organic carbon content of source rock obtained by fitting the organic carbon content formula (Formula (1)), V HI is the hydrocarbon generation amount of the source rock obtained by fitting the hydrocarbon generation amount formula (Formula (4)), ρ is the density of the source rock corresponding to the source rock samples at different depths, which can be obtained from the well logging curve, and H is the interval of the well logging data.

[0072] Specifically, in practical applications, the hydrocarbon generation intensity of the source rock at the corresponding depth can be calculated using the TOC content of the source rock obtained from formula (1) and the hydrocarbon generation amount of the source rock obtained from formula (4). The calculation formula is shown in formula (6):

[0073] Q1=V TOC ×ρ×V HI (6)

[0074] Where V TOC is the TOC content of the source rock at the corresponding depth calculated by formula (1); ρ is the density of the source rock at the corresponding depth, which can be obtained from the well logging curve in step S110; V HI is the hydrocarbon generation amount of source rock calculated by formula (2).

[0075] Considering the well logging data interval H, that is, the logging data corresponding to a depth every H interval, the hydrocarbon generation intensity of the source rock at a certain depth obtained by formula (6) is accumulated to obtain the hydrocarbon generation intensity of the source rock at the corresponding thickness. This yields the improved formula for calculating the hydrocarbon generation intensity of highly overmature marine source rocks (formula (5)). Where H is the well logging data interval, generally 0.125 m. Using typical well data, the hydrocarbon generation intensity of the source rock can be determined according to formula (5).

[0076] The present invention utilizes logging data from well-developed source rock sections, combined with experimental and theoretical demonstrations to establish fitting formulas for source rock organic carbon content and source rock hydrocarbon generation, to obtain a revised formula for calculating the hydrocarbon generation intensity of highly overmature marine source rocks. The present invention does not require the collection of a large number of core samples, reducing the costs of core sampling and analytical testing. It can be used in areas with few wells and deep layers where core samples are difficult to obtain, thus improving the limitations of previous methods. The revised formula for calculating the hydrocarbon generation intensity of highly overmature marine source rocks also utilizes a cumulative method, avoiding human interference caused by parameter selection when averaging, thereby increasing operability. This method can be used to obtain hydrocarbon generation intensity data for each well location, draw maps of hydrocarbon generation intensity, and effectively support the optimization of favorable zones and the demonstration of risk targets.

[0077] Example 2

[0078] The present invention also proposes a device for determining the hydrocarbon generation intensity of highly over-mature marine source rocks, such as Figure 5 As shown, it includes an original logging curve acquisition module 10, an organic carbon content curve generation module 20, a target logging curve screening module 30, a first formula establishment module 40, a second formula establishment module 50, and a hydrocarbon generation intensity calculation module 60, wherein:

[0079] The original logging curve acquisition module 10 is used to obtain the target layer section where source rocks are developed and obtain the original logging curve of the layer section.

[0080] In practical applications, we first investigate the structure and sedimentary background of the target area, understand the development characteristics of the main lithologies in the target area, screen out the layers where source rocks develop, and obtain the acoustic wave curves, natural gamma curves, resistivity curves, density curves and other logging curves of the layers.

[0081] The organic carbon content curve generating module 20 is used to obtain the organic carbon content of source rock samples at different depths and generate a source rock organic carbon content curve.

[0082] The source rock organic carbon content (which can be recorded as TOC content) of a certain amount of source rock samples at different depths can be obtained through experimental testing to generate a source rock organic carbon content curve.

[0083] The target logging curve screening module 30 is used to perform a multivariate regression analysis on the original logging curve obtained and the organic carbon content curve of the source rock, and select a target logging curve that meets the required correlation with the organic carbon content curve of the source rock.

[0084] Using the logging curves obtained in the original logging curve acquisition module 10, a multivariate regression analysis is performed on each logging curve and the TOC content curve generated by the organic carbon content curve generation module 20. Each logging curve is fitted with the TOC content curve to obtain the correlation between each logging curve and the TOC content curve. The logging curve with a good correlation with the TOC content curve is preferred, and the selected multiple logging curves are used as target logging curves.

[0085] The first formula establishing module 40 is used to fit the target well logging curve with the source rock organic carbon content of source rock samples obtained at different depths, and establish a source rock organic carbon content fitting formula.

[0086] Specifically, the established fitting formula for the organic carbon content of source rocks can be:

[0087] V TOC =ΣA i ×C i + B (1)

[0088] Among them, V TOC The organic carbon content of source rock samples obtained at different depths, C i is the data of the i-th target logging curve, A i The coefficient A corresponding to the i-th logging curve can be obtained by using the organic carbon content of source rock samples at different depths and the data of the target logging curve. i , calculate parameter B.

[0089] The second formula building module 50 is used to build a fitting formula for the hydrocarbon generation amount of the source rock using the preset maturity of the source rock.

[0090] The inventors find that the hydrocarbon generation conversion rate of the source rock is in logarithmic relationship with the maturity, and thus the hydrocarbon generation amount of the source rock is in logarithmic relationship with the maturity (as shown in Figure 4 The hydrocarbon generation amount of the source rock corresponding to the maturity of the source rock can be obtained by fitting, and the hydrocarbon generation amount calculation formula (4) can be obtained:

[0091] V HI = α × In (Ro) + β (4)

[0092] In the formula, Ro is the maturity of the source rock, V HI is the hydrocarbon generation amount of the source rock obtained by fitting the maturity of the source rock, and α and β are calculation parameters obtained by comparing the maturity of the source rock and the hydrocarbon generation amount of the source rock. The maturity Ro of the source rock can be obtained by experimental test or fitting by depth. The inventors find that the maturity is positively correlated with the depth and the low temperature gradient, and the geothermal gradient of a certain region can be obtained by inquiry, and thus the corresponding maturity can be obtained by fitting by depth.

[0093] The hydrocarbon generation intensity calculation module 60 is configured to obtain the hydrocarbon generation intensity of the over-mature marine source rock according to the following formula by using the source rock organic carbon content fitting formula, the source rock hydrocarbon generation amount fitting formula, the logging data interval, and the source rock density corresponding to the source rock samples at different depths:

[0094] Q = ∑V TOC × H × ρ × V HI (5)

[0095] In the formula, Q is the hydrocarbon generation intensity of the over-mature marine source rock, V TOC is the source rock organic carbon content obtained by the source rock organic carbon content fitting formula, V HI is the source rock hydrocarbon generation amount obtained by the source rock hydrocarbon generation amount fitting formula, ρ is the source rock density corresponding to the source rock samples at different depths, which can be obtained from the original logging curve in the original logging curve obtaining module 10, and H is the logging data interval, which is generally 0.125 m.

[0096] For a more detailed implementation of the device of the present invention, please refer to Example 1, which will not be described in detail here. The device for determining the hydrocarbon generation intensity of highly overmature marine source rocks of the present invention uses the logging data of the standard developed source rock section, and combines the source rock organic carbon content fitting formula and the source rock hydrocarbon generation amount fitting formula established by experimental and theoretical demonstration to obtain a revised formula for calculating the hydrocarbon generation intensity of highly overmature marine source rocks. The present invention does not require the collection of a large number of core samples, which reduces the costs of core sampling and analysis testing, and can be used in areas with few wells and deep layers where core samples are difficult to obtain, thus improving the limitations of previous methods; the revised formula for calculating the hydrocarbon generation intensity of highly overmature marine source rocks also uses the accumulation method, which avoids the human interference caused by the selection of parameters when averaging, and increases operability. The present invention can be used to obtain the hydrocarbon generation intensity data of each well location, draw maps such as hydrocarbon generation intensity, and effectively support the optimization of favorable zones and the demonstration of risk targets.

[0097] In addition, an embodiment of the present invention also discloses a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the method for determining the hydrocarbon generation intensity of highly overmature marine source rocks as described in Example 1.

[0098] Based on the same inventive concept, an embodiment of the present invention also provides a computer-readable storage medium, which stores a method for segmenting continuous data of node seismic acquisition for executing the method for determining the hydrocarbon generation intensity of highly overmature marine source rocks described in Example 1.

[0099] In the foregoing detailed description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure should not be interpreted as reflecting an intention that embodiments of the claimed subject matter require more features than are expressly recited in each claim. On the contrary, as reflected in the appended claims, the invention comprises less than all the features of any individual disclosed embodiment. The appended claims are therefore hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.

[0100] The foregoing description includes examples of one or more embodiments. Of course, it is not possible to describe all possible combinations of components or methods for the purposes of describing the above embodiments, but it will be appreciated by those skilled in the art that the various embodiments may be further combined and arranged. Therefore, the embodiments described herein are intended to encompass all such changes, modifications and variations that fall within the scope of the appended claims. Furthermore, to the extent that the term "comprising" is used in the specification or claims, the term is intended to be encompassed in a manner similar to the term "including," as explained by "including," when used as a transitional word in the claims. Furthermore, any use of the term "or" in the specification of the claims is intended to mean a "non-exclusive or."

Claims

1. A method for determining the hydrocarbon generation intensity of highly overmature marine source rocks, characterized in that: The following steps are involved: Obtain the target layer section where source rocks are developed and obtain the original logging curve of the layer section; Obtain the source rock organic carbon content of source rock samples at different depths and generate a source rock organic carbon content curve; Perform multiple regression analysis on the original well logging curves and the organic carbon content curves of the source rocks, and select the target well logging curve that meets the required correlation with the organic carbon content curves of the source rocks; Fitting the target logging curve with the source rock organic carbon content of source rock samples obtained at different depths to establish a source rock organic carbon content fitting formula; Using the preset maturity of source rocks, a fitting formula for source rock hydrocarbon generation is constructed; Using the fitting formula of source rock organic carbon content, the fitting formula of source rock hydrocarbon generation amount, the logging data interval, and the source rock density corresponding to source rock samples at different depths, the hydrocarbon generation intensity of highly overmature marine source rocks is obtained according to the following formula: Q=∑V TOC ×H×ρ×HI Where Q is the hydrocarbon generation intensity of highly over-mature marine source rocks, V TOC is the organic carbon content of the source rock obtained by the fitting formula of the organic carbon content of the source rock, HI is the hydrocarbon generation amount of the source rock obtained by the fitting formula of the hydrocarbon generation amount of the source rock, ρ is the source rock density corresponding to the source rock samples at different depths, and H is the logging data interval.

2. The method according to claim 1, wherein The step of obtaining a target layer section where source rocks are developed and obtaining an original well logging curve of the layer section includes: Investigate the structural and sedimentary background of the target area, understand the development characteristics of the main lithologies in the target area, screen out the layers where source rocks are developed, and obtain the original logging curves of the layers.

3. The method according to claim 1, wherein The original logging curves include at least sonic curves, natural gamma curves, resistivity curves, and density curves.

4. The method according to claim 1, wherein The method of fitting the target well logging curve with the organic carbon content of source rock samples obtained at different depths to establish a fitting formula for the organic carbon content of the source rock comprises: The established fitting formula for the organic carbon content of source rocks is: V TOC =ΣA i ×C i +B Among them, V TOC The organic carbon content of source rock samples obtained at different depths, C i is the data of the i-th target logging curve, A i is the coefficient corresponding to the i-th logging curve, and B is the calculation parameter; The organic carbon content of source rock samples at different depths and the data of target logging curves are used to obtain the coefficients and calculation parameters corresponding to the logging curves.

5. The method according to claim 1, wherein The method of constructing a fitting formula for hydrocarbon generation amount of source rock by using the preset maturity of source rock includes: The fitting formula for hydrocarbon generation of source rocks is: HI=α×In(Ro)+β Where Ro is the maturity of the source rock, HI is the hydrocarbon generation capacity of the source rock obtained by fitting the maturity of the source rock, and α and β are calculation parameters obtained by comparing the maturity of the source rock and the hydrocarbon generation capacity of the source rock.

6. The method according to claim 1, wherein The maturity of the source rock is obtained by experimental testing or by depth fitting.

7. The method according to claim 1, wherein The logging curve data interval is 0.125m.

8. A device for determining the hydrocarbon generation intensity of highly overmature marine source rocks, characterized in that: It includes an original logging curve acquisition module, an organic carbon content curve generation module, a target logging curve screening module, a first formula establishment module, a second formula establishment module, and a hydrocarbon generation intensity calculation module, wherein: The original logging curve acquisition module is used to obtain the target layer section where source rock is developed and obtain the original logging curve of the layer section; The organic carbon content curve generating module is used to obtain the organic carbon content of source rock samples at different depths and generate a source rock organic carbon content curve; The target well logging curve screening module is used to perform a multivariate regression analysis on the original well logging curve obtained and the organic carbon content curve of the source rock, and select the target well logging curve that meets the required correlation with the organic carbon content curve of the source rock; The first formula establishment module is used to fit the target well logging curve with the source rock organic carbon content of source rock samples obtained at different depths to establish a source rock organic carbon content fitting formula; The second formula building module is used to build a fitting formula for hydrocarbon generation amount of source rocks using the preset maturity of source rocks; The hydrocarbon generation intensity calculation module is used to calculate the hydrocarbon generation intensity of highly overmature marine source rocks using the fitting formula of source rock organic carbon content, the fitting formula of source rock hydrocarbon generation amount, the logging data interval, and the source rock density corresponding to source rock samples at different depths according to the following formula: Q=∑V TOC ×H×ρ×HI Where Q is the hydrocarbon generation intensity of highly over-mature marine source rocks, V TOC is the organic carbon content of the source rock obtained by the fitting formula of the organic carbon content of the source rock, HI is the hydrocarbon generation amount of the source rock obtained by the fitting formula of the hydrocarbon generation amount of the source rock, ρ is the source rock density corresponding to the source rock samples at different depths, and H is the logging data interval.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the method according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program for executing the method according to any one of claims 1 to 7.

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