Reservoir productivity assessment method, device and equipment based on formation pressure coefficient and medium
By screening target shale and shale to be evaluated, and using a dipole sonic logging tool to extract P-wave and S-wave transit time curves, drawing cross plots and calculating formation pressure coefficients, the problem of low accuracy of pressure coefficients in marine shale formations using traditional methods is solved, and efficient assessment of reservoir productivity is achieved.
Patent Information
- Application Number
- CN202411498840.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-25
- Publication Date
- 2026-05-05
AI Technical Summary
Traditional formation pressure prediction methods are not universally applicable in marine shale or tight formations, resulting in low accuracy of formation pressure coefficients and affecting the accuracy and efficiency of reservoir productivity assessment.
By screening target shale and shale to be evaluated, the P-wave and S-wave time difference curves are extracted using a dipole sonic logging tool, cross plots are drawn and relationships are generated, formation pressure coefficients are calculated, and the influence of complex pressure systems and increased oil and gas pore pressure is eliminated.
It improves the applicability and accuracy of formation pressure coefficient, saves testing time, and enables accurate assessment of reservoir productivity.
Smart Images
Figure CN121976797A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of oil and gas exploration and development technology, and in particular to a method, apparatus, equipment and medium for reservoir productivity assessment based on formation pressure coefficient. Background Technology
[0002] Formation pressure is the most direct indicator of oil and gas production capacity, reflecting the conditions for oil and gas exploration and development, and influencing exploration and development decisions and success rates. Currently, traditional formation pressure prediction is mainly based on shale compaction theory, but its applicability in marine shale or tight formations is not strong, resulting in low accuracy of the predicted formation pressure coefficient.
[0003] As can be seen from the above, how to improve the applicability, accuracy and efficiency of calculating formation pressure coefficients and achieve accurate assessment of reservoir productivity is a problem to be solved in this field. Summary of the Invention
[0004] In view of this, the purpose of this invention is to provide a method, apparatus, equipment, and medium for reservoir productivity assessment based on formation pressure coefficient, which can improve the applicability, accuracy, and efficiency of calculating formation pressure coefficient, and achieve accurate assessment of reservoir productivity. The specific solution is as follows:
[0005] In a first aspect, this application discloses a reservoir productivity assessment method based on formation pressure coefficient, including:
[0006] According to the preset shale screening conditions, target shales corresponding to the shale to be evaluated are screened from all shales. Curve extraction is performed on the target shale and the shale to be evaluated to obtain the P-wave transit time and S-wave transit time curves of the target shale and the P-wave transit time and S-wave transit time curves of the shale to be evaluated. The target shale is a shale with no gas measurement anomalies in the surrounding area.
[0007] Using the P-wave and S-wave transit time curves of the target shale and the P-wave and S-wave transit time curves of the shale to be evaluated, a cross plot of the P-wave and S-wave transit time of the target shale and the shale to be evaluated is drawn.
[0008] Based on the intersection diagram of P-wave and S-wave transit time, the relationship between P-wave and S-wave transit time of the target shale and the relationship between P-wave and S-wave transit time of the shale to be evaluated are generated. The formation pressure coefficient is calculated according to the relationship between P-wave and S-wave transit time of the target shale and the relationship between P-wave and S-wave transit time of the shale to be evaluated. The reservoir productivity of the shale to be evaluated is then assessed using the formation pressure coefficient.
[0009] Optionally, the step of selecting target shales corresponding to the shale to be evaluated from all shales according to preset shale screening conditions includes:
[0010] According to the preset shale screening conditions, target shales corresponding to the shale to be evaluated are selected from all shales, and the target shales are used as background layers; wherein, the shale screening conditions include well and sedimentary system screening conditions, lithological screening conditions, orientation screening conditions, interval screening conditions, and gas logging screening conditions.
[0011] Optionally, the step of extracting curves from the target shale and the shale to be evaluated includes:
[0012] The target shale and the shale to be evaluated are respectively extracted using a preset curve extraction device; the preset curve extraction device includes a dipole acoustic logging tool.
[0013] Optionally, the step of generating the relationship between the P-wave and S-wave transit times of the target shale and the relationship between the P-wave and S-wave transit times of the shale to be evaluated based on the cross-plot of the P-wave and S-wave transit times includes:
[0014] Based on the intersection diagrams of the P-wave time difference and the S-wave time difference, the intersection trend lines of the target shale and the shale to be evaluated are determined respectively.
[0015] Based on the target shale intersection trend line and the shale to be evaluated intersection trend line, generate the relationship between the P-wave and S-wave travel time of the target shale and the relationship between the P-wave and S-wave travel time of the shale to be evaluated.
[0016] Optionally, the relationship between the P-wave transit time and the S-wave transit time of the target shale is as follows:
[0017] DTS = A * DTC + B;
[0018] Wherein, DTS is the shear wave transit time of the target shale, A is the slope of the intersection line of the P-wave transit time and the shear wave transit time of the target shale, B is the intercept of the intersection line of the P-wave transit time and the shear wave transit time of the target shale, and DTC is the P-wave transit time of the target shale.
[0019] Optionally, the relationship between the P-wave transit time and S-wave transit time of the shale to be evaluated is as follows:
[0020] DTS = C * DTC + D;
[0021] Wherein, DTS is the shear wave transit time of the shale to be evaluated, C is the slope of the intersection line of the P-wave transit time and the shear wave transit time of the shale to be evaluated, D is the intercept of the intersection line of the P-wave transit time and the shear wave transit time of the shale to be evaluated, and DTC is the P-wave transit time of the shale to be evaluated.
[0022] Optionally, the formula for calculating the formation pressure coefficient is:
[0023] ;
[0024] Wherein, PX is the formation pressure coefficient, K is the base value of the pressure coefficient of the target shale, A is the slope of the intersection line of the P-wave and S-wave transit times of the target shale, and C is the slope of the intersection line of the P-wave and S-wave transit times of the shale to be evaluated.
[0025] Secondly, this application discloses a reservoir productivity assessment device based on formation pressure coefficient, comprising:
[0026] The curve extraction module is used to select target shales corresponding to the shale to be evaluated from all shales according to preset shale screening conditions, and to extract curves from the target shales and the shale to be evaluated respectively to obtain the P-wave transit time and S-wave transit time curves of the target shales and the P-wave transit time and S-wave transit time curves of the shale to be evaluated; wherein, the target shale is a shale with no gas measurement anomalies in the surrounding area;
[0027] The intersection plotting module is used to plot the P-wave and S-wave transit time curves of the target shale and the shale to be evaluated using the P-wave and S-wave transit time curves of the target shale and the shale to be evaluated.
[0028] The formation pressure coefficient calculation module is used to generate the relationship between the P-wave and S-wave transit times of the target shale and the shale to be evaluated based on the P-wave and S-wave transit time intersection diagram. It calculates the formation pressure coefficient according to the relationship between the P-wave and S-wave transit times of the target shale and the shale to be evaluated, and uses the formation pressure coefficient to evaluate the reservoir productivity of the shale to be evaluated.
[0029] Thirdly, this application discloses an electronic device, including:
[0030] Memory, used to store computer programs;
[0031] A processor is used to execute the computer program to implement the aforementioned reservoir productivity assessment method based on formation pressure coefficient.
[0032] Fourthly, this application discloses a computer storage medium for storing a computer program; wherein, when the computer program is executed by a processor, it implements the steps of the aforementioned disclosed reservoir productivity assessment method based on formation pressure coefficient.
[0033] Therefore, this application provides a reservoir productivity assessment method based on formation pressure coefficient, including screening target shales corresponding to the shale to be assessed from all shales according to preset shale screening conditions, extracting curves from the target shale and the shale to be assessed to obtain the P-wave and S-wave transit time curves of the target shale and the shale to be assessed; and using the P-wave and S-wave transit time curves of the target shale and the shale to be assessed... A cross-plot of the P-wave and S-wave transit times of the target shale and the shale to be evaluated is plotted. Based on the cross-plot of the P-wave and S-wave transit times, a relationship between the P-wave and S-wave transit times of the target shale and the shale to be evaluated is generated. The formation pressure coefficient is calculated according to the relationship between the P-wave and S-wave transit times of the target shale and the shale to be evaluated. The formation pressure coefficient is then used to evaluate the reservoir productivity of the shale to be evaluated. This application selects target shales corresponding to the shale to be evaluated based on shale screening conditions. This can offset the influence of complex pressure system factors and eliminate the influence of increased pore pressure caused by oil and gas. It extracts the P-wave and S-wave transit time curves of the target shale and the shale to be evaluated, draws the P-wave and S-wave transit time intersection diagram, determines the relationship between the P-wave and S-wave transit time of the target shale and the shale to be evaluated, and calculates the formation pressure coefficient. Compared with existing technologies such as micro-pressure or formation testing, this method is more convenient and can save a lot of testing time. Finally, the formation pressure coefficient is used to evaluate the reservoir productivity of the shale to be evaluated, which can improve the applicability, accuracy, and efficiency of calculating the formation pressure coefficient and achieve accurate evaluation of reservoir productivity. Attached Figure Description
[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.
[0035] Figure 1 This application discloses a flowchart of a reservoir productivity assessment method based on formation pressure coefficient.
[0036] Figure 2 This is a cross plot of the P-wave and S-wave transit times of the target shale and the shale to be evaluated disclosed in this application;
[0037] Figure 3 This is a schematic diagram of a reservoir productivity assessment device based on formation pressure coefficient disclosed in this application;
[0038] Figure 4This application provides a structural diagram of an electronic device. Detailed Implementation
[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0040] Formation pressure is the most direct indicator of oil and gas production capacity, reflecting the conditions for oil and gas exploration and development, and influencing exploration and development decisions and success rates. Currently, traditional formation pressure prediction is mainly based on shale compaction theory, but its applicability in marine shale or tight formations is limited, resulting in low accuracy of the predicted formation pressure coefficient. Therefore, improving the applicability, accuracy, and efficiency of calculating formation pressure coefficients to achieve accurate reservoir productivity assessment is a problem that needs to be solved in this field.
[0041] See Figure 1 As shown in the figure, this invention discloses a reservoir productivity assessment method based on formation pressure coefficient, which may specifically include:
[0042] Step S11: Select target shales corresponding to the shale to be evaluated from all shales according to preset shale screening conditions, and extract curves for the target shale and the shale to be evaluated respectively to obtain the P-wave transit time and S-wave transit time curves of the target shale and the P-wave transit time and S-wave transit time curves of the shale to be evaluated; wherein, the target shale is a shale with no gas measurement anomalies in the surrounding area.
[0043] In this embodiment, a target shale corresponding to the shale to be evaluated is selected from all shales according to preset shale screening conditions, and the target shale is used as a background layer. Then, a preset curve extraction device is used to extract curves from the target shale and the shale to be evaluated to obtain the P-wave and S-wave transit time curves of the target shale and the P-wave and S-wave transit time curves of the shale to be evaluated. The target shale is a shale without surrounding gas logging anomalies. The shale screening conditions include well and sedimentary system screening conditions, lithology screening conditions, orientation screening conditions, interval screening conditions, and gas logging screening conditions. The preset curve extraction device includes a dipole acoustic logging tool.
[0044] For example, a target shale from the same well, within the same sedimentary system, with lithology similar to the shale to be evaluated, and closely spaced vertically, without gas logging anomalies, can be selected as a background layer to eliminate the influence of increased pore pressure caused by hydrocarbons. Then, dipole sonic logging and other equipment can be used to extract the P-wave and S-wave transit time curves. The reservoir productivity assessment method based on formation pressure coefficient proposed in this application is simple and practical. Because adjacent well sections in the same well area are selected, the influence of complex pressure system factors is mutually offset, making it easy to operate.
[0045] Step S12: Using the P-wave and S-wave transit time curves of the target shale and the P-wave and S-wave transit time curves of the shale to be evaluated, draw a cross plot of the P-wave and S-wave transit time of the target shale and the shale to be evaluated.
[0046] In this embodiment, using the P-wave and S-wave transit time curves of the target shale and the shale to be evaluated extracted in step S11, a cross-plot of the P-wave and S-wave transit time of the target shale and the shale to be evaluated is drawn, as shown below. Figure 2 As shown.
[0047] Step S13: Based on the intersection diagram of P-wave and S-wave transit time, generate the relationship between P-wave and S-wave transit time of the target shale and the relationship between P-wave and S-wave transit time of the shale to be evaluated. Calculate the formation pressure coefficient according to the relationship between P-wave and S-wave transit time of the target shale and the relationship between P-wave and S-wave transit time of the shale to be evaluated. Use the formation pressure coefficient to evaluate the reservoir productivity of the shale to be evaluated.
[0048] In this embodiment, the intersection trend lines of the target shale and the shale to be evaluated are determined based on the intersection diagrams of the P-wave and S-wave transit times, respectively. Based on these intersection trend lines, the relationship between the P-wave and S-wave transit times of the target shale and the shale to be evaluated is generated. The formation pressure coefficient is then calculated based on these relationship lines, and the reservoir productivity of the shale to be evaluated is assessed using the formation pressure coefficient.
[0049] Specifically, the relationship between the P-wave transit time and the S-wave transit time of the target shale is as follows:
[0050] DTS = A * DTC + B;
[0051] Where DTS represents the shear wave transit time of the target shale. A is the slope of the intersection line of the P-wave and S-wave transit times of the target shale, B is the intercept of the intersection line of the P-wave and S-wave transit times of the target shale, and DTC is the P-wave transit time of the target shale.
[0052] Specifically, the relationship between the P-wave transit time and S-wave transit time of the shale to be evaluated is as follows:
[0053] DTS = C * DTC + D;
[0054] Wherein, DTS represents the shear wave transit time of the shale to be evaluated. C is the slope of the intersection line of the P-wave and S-wave transit times of the shale to be evaluated, D is the intercept of the intersection line of the P-wave and S-wave transit times of the shale to be evaluated, and DTC is the P-wave transit time of the shale to be evaluated.
[0055] Specifically, the formula for calculating the formation pressure coefficient is as follows:
[0056] ;
[0057] Wherein, PX is the formation pressure coefficient, which is dimensionless; K is the base value of the pressure coefficient of the target shale; A is the slope of the intersection line of the P-wave and S-wave transit times of the target shale; and C is the slope of the intersection line of the P-wave and S-wave transit times of the shale to be evaluated.
[0058] The innovations of this application are: (1) Selecting adjacent well sections in the same well area cancels out the influence of complex pressure system factors, which is convenient for operation; (2) The formation pressure coefficient can be calculated by using the target shale P-wave and S-wave time difference curves and the shale P-wave and S-wave time difference curves of the shale to be evaluated measured by the block evaluation well. Through application in more than ten well areas with different pressure systems in southeastern Sichuan, the calculation results show a high degree of consistency with the gas test results; (3) This application uses dipole acoustic waves to extract curves of the target shale and the shale to be evaluated, thereby calculating the formation pressure coefficient. Compared with micro pressure or formation testing methods, this is more convenient, the cost is greatly reduced, a lot of testing time is saved, and the efficiency is higher.
[0059] In this embodiment, target shales corresponding to the shale to be evaluated are selected from all shales according to preset shale screening conditions. Curve extraction is performed on the target shale and the shale to be evaluated to obtain the P-wave and S-wave transit time curves of the target shale and the shale to be evaluated. Using the P-wave and S-wave transit time curves of the target shale and the shale to be evaluated, a P-wave and S-wave transit time intersection diagram of the target shale and the shale to be evaluated is drawn. Based on the P-wave and S-wave transit time intersection diagram, the P-wave and S-wave transit time relationship formulas of the target shale and the shale to be evaluated are generated. The formation pressure coefficient is calculated according to the P-wave and S-wave transit time relationship formulas of the target shale and the shale to be evaluated, and the reservoir productivity of the shale to be evaluated is assessed using the formation pressure coefficient. This application selects target shales corresponding to the shale to be evaluated based on shale screening conditions. This can offset the influence of complex pressure system factors and eliminate the influence of increased pore pressure caused by oil and gas. It extracts the P-wave and S-wave transit time curves of the target shale and the shale to be evaluated, draws the P-wave and S-wave transit time intersection diagram, determines the relationship between the P-wave and S-wave transit time of the target shale and the shale to be evaluated, and calculates the formation pressure coefficient. Compared with existing technologies such as micro-pressure or formation testing, this method is more convenient and can save a lot of testing time. Finally, the formation pressure coefficient is used to evaluate the reservoir productivity of the shale to be evaluated, which can improve the applicability, accuracy, and efficiency of calculating the formation pressure coefficient and achieve accurate evaluation of reservoir productivity.
[0060] See Figure 3 As shown in the figure, this invention discloses a reservoir productivity assessment device based on formation pressure coefficient, which may specifically include:
[0061] The curve extraction module 11 is used to select target shales corresponding to the shale to be evaluated from all shales according to preset shale screening conditions, and to extract curves from the target shales and the shale to be evaluated respectively to obtain the P-wave transit time and S-wave transit time curves of the target shales and the P-wave transit time and S-wave transit time curves of the shale to be evaluated; wherein, the target shale is a shale without surrounding gas measurement anomalies;
[0062] The intersection plotting module 12 is used to plot the P-wave transit time and S-wave transit time of the target shale and the P-wave transit time and S-wave transit time of the shale to be evaluated using the P-wave transit time and S-wave transit time curves of the target shale and the shale to be evaluated.
[0063] The formation pressure coefficient calculation module 13 is used to generate the relationship between the P-wave and S-wave transit times of the target shale and the shale to be evaluated based on the P-wave transit time and S-wave transit time intersection diagram, calculate the formation pressure coefficient according to the relationship between the P-wave and S-wave transit times of the target shale and the shale to be evaluated, and use the formation pressure coefficient to evaluate the reservoir productivity of the shale to be evaluated.
[0064] In this embodiment, target shales corresponding to the shale to be evaluated are selected from all shales according to preset shale screening conditions. Curve extraction is performed on the target shale and the shale to be evaluated to obtain the P-wave and S-wave transit time curves of the target shale and the shale to be evaluated. Using the P-wave and S-wave transit time curves of the target shale and the shale to be evaluated, a P-wave and S-wave transit time intersection diagram of the target shale and the shale to be evaluated is drawn. Based on the P-wave and S-wave transit time intersection diagram, the P-wave and S-wave transit time relationship formulas of the target shale and the shale to be evaluated are generated. The formation pressure coefficient is calculated according to the P-wave and S-wave transit time relationship formulas of the target shale and the shale to be evaluated, and the reservoir productivity of the shale to be evaluated is assessed using the formation pressure coefficient. This application selects target shales corresponding to the shale to be evaluated based on shale screening conditions. This can offset the influence of complex pressure system factors and eliminate the influence of increased pore pressure caused by oil and gas. It extracts the P-wave and S-wave transit time curves of the target shale and the shale to be evaluated, draws the P-wave and S-wave transit time intersection diagram, determines the relationship between the P-wave and S-wave transit time of the target shale and the shale to be evaluated, and calculates the formation pressure coefficient. Compared with existing technologies such as micro-pressure or formation testing, this method is more convenient and can save a lot of testing time. Finally, the formation pressure coefficient is used to evaluate the reservoir productivity of the shale to be evaluated, which can improve the applicability, accuracy, and efficiency of calculating the formation pressure coefficient and achieve accurate evaluation of reservoir productivity.
[0065] In some specific embodiments, the curve extraction module 11 may specifically include:
[0066] The screening module is used to screen target shales corresponding to the shale to be evaluated from all shales according to preset shale screening conditions, and to use the target shales as background layers; wherein, the shale screening conditions include well and sedimentary system screening conditions, lithological screening conditions, directional screening conditions, interval screening conditions, and gas logging screening conditions.
[0067] In some specific embodiments, the curve extraction module 11 may specifically include:
[0068] The extraction module is used to extract curves from the target shale and the shale to be evaluated using a preset curve extraction device; the preset curve extraction device includes a dipole acoustic logging tool.
[0069] In some specific embodiments, the formation pressure coefficient calculation module 13 may specifically include:
[0070] The trend line determination module is used to determine the intersection trend line of the target shale and the intersection trend line of the shale to be evaluated based on the intersection diagram of the longitudinal wave time difference and the transverse wave time difference, respectively.
[0071] The relation generation module is used to generate the P-wave and S-wave time difference relationships of the target shale and the shale to be evaluated based on the intersection trend line of the target shale and the intersection trend line of the shale to be evaluated.
[0072] In some specific embodiments, the relationship between the P-wave transit time and the S-wave transit time of the target shale is as follows:
[0073] DTS = A * DTC + B;
[0074] Wherein, DTS is the shear wave transit time of the target shale, A is the slope of the intersection line of the P-wave transit time and the shear wave transit time of the target shale, B is the intercept of the intersection line of the P-wave transit time and the shear wave transit time of the target shale, and DTC is the P-wave transit time of the target shale.
[0075] In some specific embodiments, the relationship between the P-wave transit time and S-wave transit time of the shale to be evaluated is as follows:
[0076] DTS = C * DTC + D;
[0077] Wherein, DTS is the shear wave transit time of the shale to be evaluated, C is the slope of the intersection line of the P-wave transit time and the shear wave transit time of the shale to be evaluated, D is the intercept of the intersection line of the P-wave transit time and the shear wave transit time of the shale to be evaluated, and DTC is the P-wave transit time of the shale to be evaluated.
[0078] In some specific embodiments, the formula for calculating the formation pressure coefficient is as follows:
[0079] ;
[0080] Wherein, PX is the formation pressure coefficient, K is the base value of the pressure coefficient of the target shale, A is the slope of the intersection line of the P-wave and S-wave transit times of the target shale, and C is the slope of the intersection line of the P-wave and S-wave transit times of the shale to be evaluated.
[0081] Figure 4This is a schematic diagram of an electronic device provided in an embodiment of this application. The electronic device 20 may specifically include: at least one processor 21, at least one memory 22, a power supply 23, a communication interface 24, an input / output interface 25, and a communication bus 26. The memory 22 stores a computer program, which is loaded and executed by the processor 21 to implement the relevant steps in the reservoir productivity assessment method based on formation pressure coefficient disclosed in any of the foregoing embodiments.
[0082] In this embodiment, the power supply 23 is used to provide operating voltage for each hardware device on the electronic device 20; the communication interface 24 can create a data transmission channel between the electronic device 20 and external devices, and the communication protocol it follows can be any communication protocol applicable to the technical solution of this application, and is not specifically limited here; the input / output interface 25 is used to acquire external input data or output data to the outside world, and its specific interface type can be selected according to specific application needs, and is not specifically limited here.
[0083] In addition, the memory 22, as a carrier for resource storage, can be a read-only memory, random access memory, disk or optical disk, etc. The resources stored on it include operating system 221, computer program 222 and data 223, etc., and the storage method can be temporary storage or permanent storage.
[0084] The operating system 221 manages and controls the various hardware devices on the electronic device 20 and the computer program 222 to enable the processor 21 to perform calculations and processing on the data 223 in the memory 22. It can be Windows, Unix, Linux, etc. The computer program 222, in addition to including a computer program capable of performing the reservoir productivity assessment method based on formation pressure coefficient as disclosed in any of the foregoing embodiments, may further include computer programs capable of performing other specific tasks. The data 223 may include data received by the reservoir productivity assessment device based on formation pressure coefficient from external devices, as well as data collected by its own input / output interface 25.
[0085] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented directly by hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.
[0086] Furthermore, this application also discloses a computer-readable storage medium storing a computer program. When the computer program is loaded and executed by a processor, it implements the steps of the reservoir productivity assessment method based on formation pressure coefficient disclosed in any of the foregoing embodiments.
[0087] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0088] The present invention provides a detailed description of a reservoir productivity assessment method, apparatus, equipment, and storage medium based on formation pressure coefficient. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.
Claims
1. A reservoir productivity assessment method based on formation pressure coefficient, characterized in that, include: According to the preset shale screening conditions, target shales corresponding to the shale to be evaluated are screened from all shales. Curve extraction is performed on the target shale and the shale to be evaluated to obtain the P-wave transit time and S-wave transit time curves of the target shale and the P-wave transit time and S-wave transit time curves of the shale to be evaluated. The target shale is a shale with no gas measurement anomalies in the surrounding area. Using the P-wave and S-wave transit time curves of the target shale and the P-wave and S-wave transit time curves of the shale to be evaluated, a cross plot of the P-wave and S-wave transit time of the target shale and the shale to be evaluated is drawn. Based on the intersection diagram of P-wave and S-wave transit time, the relationship between P-wave and S-wave transit time of the target shale and the relationship between P-wave and S-wave transit time of the shale to be evaluated are generated. The formation pressure coefficient is calculated according to the relationship between P-wave and S-wave transit time of the target shale and the relationship between P-wave and S-wave transit time of the shale to be evaluated. The reservoir productivity of the shale to be evaluated is then assessed using the formation pressure coefficient.
2. The reservoir productivity assessment method based on formation pressure coefficient according to claim 1, characterized in that, The step of selecting target shales corresponding to the shale to be evaluated from all shales according to preset shale screening conditions includes: According to the preset shale screening conditions, target shales corresponding to the shale to be evaluated are selected from all shales, and the target shales are used as background layers; wherein, the shale screening conditions include well and sedimentary system screening conditions, lithological screening conditions, orientation screening conditions, interval screening conditions, and gas logging screening conditions.
3. The reservoir productivity assessment method based on formation pressure coefficient according to claim 1, characterized in that, The step of extracting curves from the target shale and the shale to be evaluated includes: The target shale and the shale to be evaluated are respectively extracted using a preset curve extraction device; the preset curve extraction device includes a dipole acoustic logging tool.
4. The reservoir productivity assessment method based on formation pressure coefficient according to claim 1, characterized in that, The process of generating the relationship between the P-wave and S-wave transit times of the target shale and the shale to be evaluated based on the P-wave and S-wave transit time intersection diagram includes: Based on the intersection diagrams of the P-wave time difference and the S-wave time difference, the intersection trend lines of the target shale and the shale to be evaluated are determined respectively. Based on the target shale intersection trend line and the shale to be evaluated intersection trend line, generate the relationship between the P-wave and S-wave travel time of the target shale and the relationship between the P-wave and S-wave travel time of the shale to be evaluated.
5. The reservoir productivity assessment method based on formation pressure coefficient according to claim 1, characterized in that, The relationship between the P-wave transit time and S-wave transit time of the target shale is as follows: DTS = A * DTC + B; Wherein, DTS is the shear wave transit time of the target shale, A is the slope of the intersection line of the P-wave transit time and the shear wave transit time of the target shale, B is the intercept of the intersection line of the P-wave transit time and the shear wave transit time of the target shale, and DTC is the P-wave transit time of the target shale.
6. The reservoir productivity assessment method based on formation pressure coefficient according to claim 1, characterized in that, The relationship between the P-wave transit time and S-wave transit time of the shale to be evaluated is as follows: DTS = C * DTC + D; Wherein, DTS is the shear wave transit time of the shale to be evaluated, C is the slope of the intersection line of the P-wave transit time and the shear wave transit time of the shale to be evaluated, D is the intercept of the intersection line of the P-wave transit time and the shear wave transit time of the shale to be evaluated, and DTC is the P-wave transit time of the shale to be evaluated.
7. The reservoir productivity assessment method based on formation pressure coefficient according to any one of claims 1 to 6, characterized in that, The formula for calculating the formation pressure coefficient is as follows: ； Wherein, PX is the formation pressure coefficient, K is the base value of the pressure coefficient of the target shale, A is the slope of the intersection line of the P-wave and S-wave transit times of the target shale, and C is the slope of the intersection line of the P-wave and S-wave transit times of the shale to be evaluated.
8. A reservoir productivity assessment device based on formation pressure coefficient, characterized in that, include: The curve extraction module is used to select target shales corresponding to the shale to be evaluated from all shales according to preset shale screening conditions, and to extract curves from the target shales and the shale to be evaluated respectively to obtain the P-wave transit time and S-wave transit time curves of the target shales and the P-wave transit time and S-wave transit time curves of the shale to be evaluated; wherein, the target shale is a shale with no gas measurement anomalies in the surrounding area; The intersection plotting module is used to plot the P-wave and S-wave transit time curves of the target shale and the shale to be evaluated using the P-wave and S-wave transit time curves of the target shale and the shale to be evaluated. The formation pressure coefficient calculation module is used to generate the relationship between the P-wave and S-wave transit times of the target shale and the shale to be evaluated based on the P-wave and S-wave transit time intersection diagram. It calculates the formation pressure coefficient according to the relationship between the P-wave and S-wave transit times of the target shale and the shale to be evaluated, and uses the formation pressure coefficient to evaluate the reservoir productivity of the shale to be evaluated.
9. An electronic device, characterized in that, include: Memory, used to store computer programs; A processor for executing the computer program to implement the reservoir productivity assessment method based on formation pressure coefficient as described in any one of claims 1 to 7.
10. A computer-readable storage medium, characterized in that, Used to store computer programs; wherein, when the computer programs are executed by a processor, they implement the reservoir productivity assessment method based on formation pressure coefficient as described in any one of claims 1 to 7.