CN-121976797-A - Reservoir productivity assessment method, device, equipment and medium based on stratum pressure coefficient

CN121976797ACN 121976797 ACN121976797 ACN 121976797ACN-121976797-A

Abstract

The application discloses a reservoir productivity evaluation method, device, equipment and medium based on stratum pressure coefficient, and relates to the technical field of petroleum and natural gas exploration and development, comprising the steps of screening target shale corresponding to shale to be evaluated according to shale screening conditions, and performing curve extraction on the target shale and the shale to be evaluated to obtain a target shale longitudinal wave time difference and transverse wave time difference curve and a shale longitudinal wave time difference and transverse wave time difference curve to be evaluated; and generating a target shale longitudinal wave time difference and transverse wave time difference relational expression and a shale longitudinal wave time difference and transverse wave time difference relational expression to be evaluated based on the longitudinal wave time difference and transverse wave time difference intersecting diagram, calculating a stratum pressure coefficient according to the target shale longitudinal wave time difference and transverse wave time difference relational expression and the shale time difference and transverse wave time difference relational expression to be evaluated, and evaluating the reservoir productivity of the shale to be evaluated by using the stratum pressure coefficient. The method can improve the applicability, accuracy and efficiency of calculating the stratum pressure coefficient, and can realize accurate evaluation of reservoir production capacity.

Inventors

MA LIN
GONG JINSONG
WANG SHENGCHUN
LI ZHONGWEI
YANG ZHIQIANG
Jiang Xiani

Assignees

中国石油化工集团有限公司
中石化石油工程技术服务股份有限公司
中石化经纬有限公司
中石化经纬有限公司华东测控分公司

Dates

Publication Date: 20260505
Application Date: 20241025

Claims (10)

1. A reservoir capacity assessment method based on formation pressure coefficients, comprising: screening target shale corresponding to shale to be evaluated from all shale according to preset shale screening conditions, and respectively performing curve extraction on the target shale and the shale to be evaluated to obtain a target shale longitudinal wave time difference and transverse wave time difference curve and a shale longitudinal wave time difference and transverse wave time difference curve to be evaluated, wherein the target shale is shale with no gas detection abnormality at the periphery; Drawing a longitudinal wave time difference and transverse wave time difference intersection map of the target shale and the shale to be evaluated by utilizing the longitudinal wave time difference and transverse wave time difference curve of the target shale and the longitudinal wave time difference and transverse wave time difference curve of the shale to be evaluated; And generating a target shale longitudinal wave time difference and transverse wave time difference relational expression and a shale longitudinal wave time difference and transverse wave time difference relational expression to be evaluated based on the longitudinal wave time difference and transverse wave time difference intersection diagram, calculating a stratum pressure coefficient according to the target shale longitudinal wave time difference and transverse wave time difference relational expression and the shale longitudinal wave time difference and transverse wave time difference relational expression to be evaluated, and evaluating reservoir productivity of the shale to be evaluated by utilizing the stratum pressure coefficient.
2. The method for evaluating the productivity of a reservoir based on formation pressure coefficients according to claim 1, wherein the screening target shale corresponding to the shale to be evaluated from all shale according to preset shale screening conditions comprises: And screening target shale corresponding to the shale to be evaluated from all shale according to preset shale screening conditions, and taking the target shale as a background interval, wherein the shale screening conditions comprise well and sedimentary system screening conditions, lithology screening conditions, direction screening conditions, interval screening conditions and gas detection screening conditions.
3. The method for evaluating the productivity of a reservoir based on formation pressure coefficients according to claim 1, wherein the performing curve extraction on the target shale and the shale to be evaluated respectively comprises: and respectively performing curve extraction on the target shale and the shale to be evaluated by using preset curve extraction equipment, wherein the preset curve extraction equipment comprises a dipole acoustic logging instrument.
4. The method for estimating the productivity of a reservoir based on the formation pressure coefficient according to claim 1, wherein the generating the target shale compressional wave time difference and shear wave time difference relation and the shale compressional wave time difference and shear wave time difference relation to be estimated based on the compressional wave time difference and shear wave time difference intersection map includes: Respectively determining a target shale intersection trend line and a shale intersection trend line to be evaluated based on the longitudinal wave time difference and the transverse wave time difference intersection graph; and generating a relation between the target shale longitudinal wave time difference and the transverse wave time difference and a relation between the shale longitudinal wave time difference and the transverse wave time difference to be evaluated according to the target shale intersection trend line and the shale intersection trend line to be evaluated.
5. The formation pressure coefficient-based reservoir capacity assessment method according to claim 1, wherein the target shale compressional and shear wave moveout relationship is: DTS=A*DTC+B; Wherein, DTS is the transverse wave time difference of the target shale, A is the gradient of the intersecting relation line of the longitudinal wave time difference and the transverse wave time difference of the target shale, B is the intercept of the intersecting relation line of the longitudinal wave time difference and the transverse wave time difference of the target shale, and DTC is the longitudinal wave time difference of the target shale.
6. The method for estimating the productivity of a reservoir based on the formation pressure coefficient according to claim 1, wherein the relation between the longitudinal wave time difference and the transverse wave time difference of the shale to be estimated is: DTS=C*DTC+D; Wherein, DTS is the transverse wave time difference of the shale to be evaluated, C is the gradient of the intersecting relation line of the longitudinal wave time difference and the transverse wave time difference of the shale to be evaluated, D is the intercept of the intersecting relation line of the longitudinal wave time difference and the transverse wave time difference of the shale to be evaluated, and DTC is the longitudinal wave time difference of the shale to be evaluated.
7. The method for estimating a reservoir capacity based on a formation pressure coefficient according to any one of claims 1 to 6, wherein the calculation formula of the formation pressure coefficient is: ; wherein PX is a stratum pressure coefficient, K is a pressure coefficient base value of the target shale, A is a gradient of a longitudinal wave and transverse wave time difference intersection relation line of the target shale, and C is a gradient of a longitudinal wave time difference and transverse wave time difference intersection relation line of the shale to be evaluated.
8. A reservoir capacity assessment device based on formation pressure coefficients, comprising: the system comprises a curve extraction module, a curve extraction module and a shale analysis module, wherein the curve extraction module is used for screening target shale corresponding to shale to be evaluated from all shale according to preset shale screening conditions, and respectively carrying out curve extraction on the target shale and the shale to be evaluated to obtain a target shale longitudinal wave time difference and transverse wave time difference curve and a shale longitudinal wave time difference and transverse wave time difference curve to be evaluated; the intersection graph drawing module is used for drawing an intersection graph of the longitudinal wave time difference and the transverse wave time difference of the target shale and the shale to be evaluated by utilizing the longitudinal wave time difference and the transverse wave time difference curve of the target shale and the longitudinal wave time difference and the transverse wave time difference curve of the shale to be evaluated; And the stratum pressure coefficient calculation module is used for generating a target shale longitudinal wave time difference and transverse wave time difference relation and a shale time difference and transverse wave time difference relation to be evaluated based on the longitudinal wave time difference and transverse wave time difference intersection diagram, calculating stratum pressure coefficients according to the target shale longitudinal wave time difference and transverse wave time difference relation and the shale longitudinal wave time difference and transverse wave time difference relation to be evaluated, and evaluating reservoir productivity of the shale to be evaluated by utilizing the stratum pressure coefficients.
9. An electronic device, comprising: A memory for storing a computer program; A processor for executing the computer program to implement the reservoir productivity assessment method based on formation pressure coefficients as claimed in any one of claims 1 to 7.
10. A computer readable storage medium for storing a computer program, wherein the computer program when executed by a processor implements the formation pressure coefficient based reservoir capacity assessment method according to any one of claims 1 to 7.

Description

Reservoir productivity assessment method, device, equipment and medium based on stratum pressure coefficient Technical Field The invention relates to the technical field of petroleum and natural gas exploration and development, in particular to a reservoir productivity assessment method, device, equipment and medium based on stratum pressure coefficients. Background The formation pressure is the most direct index for reflecting the oil and gas productivity, and can directly reflect the conditions of oil and gas exploration and development, and the exploration and development decision and success rate are related. At present, traditional formation pressure prediction is mainly based on a shale compaction theory, but is not strong in universality in the application process of a sea-phase shale formation or a tight formation, so that the accuracy of a predicted formation pressure coefficient is lower. From the above, how to improve the applicability, accuracy and efficiency of calculating the formation pressure coefficient and realize accurate evaluation of the reservoir productivity is a problem to be solved in the field. Disclosure of Invention Accordingly, the present invention aims to provide a reservoir productivity evaluation method, device, equipment and medium based on formation pressure coefficient, which can improve applicability, accuracy and efficiency of calculating formation pressure coefficient, and realize accurate evaluation of reservoir productivity. The specific scheme is as follows: in a first aspect, the application discloses a reservoir productivity assessment method based on a formation pressure coefficient, comprising the following steps: screening target shale corresponding to shale to be evaluated from all shale according to preset shale screening conditions, and respectively performing curve extraction on the target shale and the shale to be evaluated to obtain a target shale longitudinal wave time difference and transverse wave time difference curve and a shale longitudinal wave time difference and transverse wave time difference curve to be evaluated, wherein the target shale is shale with no gas detection abnormality at the periphery; Drawing a longitudinal wave time difference and transverse wave time difference intersection map of the target shale and the shale to be evaluated by utilizing the longitudinal wave time difference and transverse wave time difference curve of the target shale and the longitudinal wave time difference and transverse wave time difference curve of the shale to be evaluated; And generating a target shale longitudinal wave time difference and transverse wave time difference relational expression and a shale longitudinal wave time difference and transverse wave time difference relational expression to be evaluated based on the longitudinal wave time difference and transverse wave time difference intersection diagram, calculating a stratum pressure coefficient according to the target shale longitudinal wave time difference and transverse wave time difference relational expression and the shale longitudinal wave time difference and transverse wave time difference relational expression to be evaluated, and evaluating reservoir productivity of the shale to be evaluated by utilizing the stratum pressure coefficient. Optionally, screening target shale corresponding to the shale to be evaluated from all shale according to preset shale screening conditions, including: And screening target shale corresponding to the shale to be evaluated from all shale according to preset shale screening conditions, and taking the target shale as a background interval, wherein the shale screening conditions comprise well and sedimentary system screening conditions, lithology screening conditions, direction screening conditions, interval screening conditions and gas detection screening conditions. Optionally, the performing curve extraction on the target shale and the shale to be evaluated respectively includes: and respectively performing curve extraction on the target shale and the shale to be evaluated by using preset curve extraction equipment, wherein the preset curve extraction equipment comprises a dipole acoustic logging instrument. Optionally, the generating a target shale longitudinal wave time difference and transverse wave time difference relation and a shale longitudinal wave time difference and transverse wave time difference relation to be evaluated based on the longitudinal wave time difference and transverse wave time difference intersection map includes: Respectively determining a target shale intersection trend line and a shale intersection trend line to be evaluated based on the longitudinal wave time difference and the transverse wave time difference intersection graph; and generating a relation between the target shale longitudinal wave time difference and the transverse wave time difference and a relation between the shale longitudinal wave time difference and