CN-116027429-B - Pre-stack gather optimization processing method and device, electronic equipment and medium

CN116027429BCN 116027429 BCN116027429 BCN 116027429BCN-116027429-B

Abstract

The application discloses a pre-stack channel set optimization processing method, device, electronic equipment and medium, wherein the processing method comprises the steps of 1, establishing an AVO synthetic channel set based on actual logging data in a work area, 2, comparing and analyzing AVO characteristic differences of an original well side channel set and the synthetic channel set, evaluating problems existing in the original well side channel set based on the AVO characteristic differences, wherein the problems comprise noise interference, residual time difference and inconsistent near-far channel frequency spectrum, 3, conducting data optimization processing on each problem existing in the original well side channel set, correcting and perfecting the original well side channel set to the synthetic channel set, 4, conducting pre-stack inversion on data before optimization and optimized data respectively, and evaluating an optimization result of the original well side channel set based on an inversion result.

Inventors

YAO MING
MA LINGWEI
HU HUAFENG
ZHANG KEFEI
XU KAI
XIE WEI

Assignees

中国石油化工股份有限公司
中国石油化工股份有限公司石油物探技术研究院

Dates

Publication Date: 20260512
Application Date: 20211025

Claims (6)

1. The method for optimizing the prestack gather is characterized by comprising the following steps of: step 1, building an AVO synthetic gather based on actual logging data in a work area; Step 2, combining an original well side channel set and the synthetic channel set, selecting a mark layer, carrying out AVO characteristic analysis, and analyzing and evaluating the difference between the original well side channel set and the synthetic channel set from four aspects of amplitude, residual time difference, correlation and maximum frequency to determine the problems of the original well side channel set, wherein the problems comprise noise interference, residual time difference and inconsistent near-far channel frequency spectrum; Step 3, aiming at each problem of the original well side channel set, carrying out data optimization processing, and correcting and perfecting the original well side channel set to the synthetic channel set, wherein parameter testing is carried out based on the original well side channel set, and AVO characteristic change of the original well side channel set and the difference between the AVO characteristic change and the synthetic channel set are selected as prestack microscopic quality control by a mark layer analysis; and 4, respectively carrying out pre-stack inversion on the data before optimization and the data after optimization, and evaluating the optimization result of the original well bypass set based on the inversion result.
2. The method for optimizing a pre-stack gather according to claim 1, wherein step 1 comprises selecting a typical well in a work area, selecting wavelets for synthesis record calibration based on longitudinal wave velocity and density curves, obtaining corresponding time-depth relations, calculating corresponding reflection coefficients based on Zoeppritz equations by combining transverse wave velocity, and selecting wavelets to establish the AVO synthesis gather.
3. An electronic device, the electronic device comprising: at least one processor, and A memory communicatively coupled to the at least one processor, wherein, The memory stores instructions executable by the at least one processor to enable the at least one processor to perform the pre-stack gather optimization method of any one of claims 1-2.
4. A non-transitory computer readable storage medium storing computer instructions for causing a computer to perform the pre-stack gather optimization method of any one of claims 1-2.
5. A pre-stack gather optimization processing apparatus, comprising: the construction module is used for establishing an AVO synthetic gather based on actual logging data in a work area; The analysis module combines the original well side channel set and the synthetic channel set, selects a mark layer, carries out AVO characteristic analysis, analyzes and evaluates the difference between the original well side channel set and the synthetic channel set in four aspects of amplitude, residual time difference, correlation and maximum frequency, and determines the problems of the original well side channel set, wherein the problems comprise noise interference, residual time difference and inconsistent near-far channel frequency spectrum; The optimization module is used for carrying out optimization treatment on each problem existing in the original well bypass set, and correcting and perfecting the original well bypass set to the synthetic channel set, wherein parameter testing is carried out on the basis of the original well bypass set, AVO characteristic change of the original well bypass set and the difference between the AVO characteristic change and the synthetic channel set are selected as prestack microscopic quality control through a mark layer analysis, meanwhile, well passing lines of each step of optimization treatment are overlapped, and correlation of post-stack frequency spectrum and well shock calibration is used as post-stack macroscopic quality control, so that rationality of each step of optimization treatment is ensured; And the evaluation module is used for carrying out pre-stack inversion on the original data before optimization and the optimized data respectively and evaluating the optimization result of the original well bypass set based on the inversion result.
6. The apparatus of claim 5, wherein the building module is configured to select a typical well in the work area, select wavelets for performing synthesis record calibration based on a longitudinal wave velocity and a density curve, obtain a corresponding time-depth relationship, calculate a corresponding reflection coefficient based on a Zoeppritz equation in combination with a transverse wave velocity, and select wavelets to build the AVO synthesis gather.

Description

Pre-stack gather optimization processing method and device, electronic equipment and medium Technical Field The invention relates to the field of oil and gas geophysical exploration, in particular to a method, a device, electronic equipment and a medium for optimizing a prestack gather. Background The conventional post-stack wave impedance inversion method is based on post-stack data, and only a single reservoir elastic parameter, namely wave impedance information, can be obtained. The conventional post-stack wave impedance inversion method is difficult to effectively identify the reservoir in some complex areas, and particularly when the reservoir and the non-reservoir of the research area are seriously aliased, the wave impedance cannot effectively distinguish the reservoir and the non-reservoir. The pre-stack inversion method based on the pre-stack data can reflect the characteristic that the amplitude recorded by field acquisition changes along with the offset, and can fully utilize the transverse wave information closely related to the offset, so that more elastic parameters reflecting the reservoir non-reservoir distinction, such as poisson ratio, young modulus and the like, can be obtained through the pre-stack inversion. And finally, richer and more accurate basis is provided for reservoir prediction. The pre-stack inversion is widely applied to reservoir prediction, and the accuracy and reliability of an inversion result depend on an inversion algorithm on one hand and are closely related to basic data used for inversion, namely the quality of a pre-stack gather on the other hand. Ideally, the seismic information is a true reflection of subsurface lithology, reservoirs and fluids, but the seismic records are changed by the influence of various factors such as acquisition, processing and the like, and inaccurate subsurface information is reflected due to the introduction of the non-lithology, reservoirs and fluid information. The optimization processing of the pre-stack gathers can eliminate (suppress) seismic information anomalies caused by non-lithology and fluid information, recover the seismic information which can objectively reflect lithology and fluid changes, and finally improve the precision of pre-stack inversion. Aiming at various problems of low signal-to-noise ratio, uneven in-phase axis, residual time difference, inconsistent frequency spectrum and the like of the conventional processed pre-stack channel set, the conventional channel set optimization processing method mostly lacks comprehensive basic data analysis, the problems of the original channel set are often judged only by the channel set itself or are simply compared with the synthesized channel set, deep analysis is not carried out, further the development of a processing flow also tends to be subjective judgment, and meanwhile, a comprehensive and effective quality control means is also lacking in the rationality of a processing result. Therefore, a pre-stack gather optimization processing method is expected, which can perform better optimization processing on the original well side gather and provide higher-quality data for pre-stack inversion. The information disclosed in the background section of the invention is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art. Disclosure of Invention The invention aims to provide a method, a device, electronic equipment and a medium for optimizing a pre-stack gather, which can be used for better optimizing an original well side gather and providing higher-quality data for pre-stack inversion. In a first aspect, an embodiment of the present disclosure provides a method for optimizing a pre-stack gather, including: step 1, building an AVO synthetic gather based on actual logging data in a work area; step 2, comparing and analyzing AVO characteristic differences of an original well side channel set and the synthetic channel set, and evaluating problems of the original well side channel set based on the AVO characteristic differences, wherein the problems comprise noise interference, residual time difference and inconsistent near-far channel frequency spectrum; step 3, aiming at each problem of the original well side gather, carrying out data optimization processing, and correcting and perfecting the original well side gather to the synthetic gather; and 4, respectively carrying out pre-stack inversion on the data before optimization and the data after optimization, and evaluating the optimization result of the original well bypass set based on the inversion result. The method comprises the steps of selecting a typical well in a work area, selecting wavelets to perform synthesis record calibration based on longitudinal wave speed and density curves, obtaining corresponding time-depth relations, calculati