Fault velocity modeling method for eliminating well-to-seismic closure error and processing terminal

Abstract

The invention relates to a fault velocity modeling method for eliminating well-to-seismic closure error and a processing terminal. The method comprises the following steps: 1, establishing a depth domain initial interval velocity model according to seismic data; 2, establishing a construction model; 3, picking up the residual time difference of the common imaging point gather; 4, updating and iterating the depth domain initial interval velocity model; 5, performing pre-stack depth migration calculation to obtain a pre-stack depth migration profile and a pre-stack depth migration common imagingpoint gather; 6, establishing a structural model containing well information and well stratification through association of the well marks and the layers; 7, maintaining tomography during travel; 8,performing pre-stack depth migration calculation on the updated and iterated interval velocity model again; and 9, repeating depth domain interval velocity model optimization iteration to obtain a final imaging result profile. The method improves the imaging precision and the precision of a speed model, and effectively reduces the exploration risk.

Description

Technical field [0001] The invention relates to the technical field of seismic exploration, in particular to a method and processing terminal for velocity modeling under a fault that eliminates the well-seismic closure difference. Background technique [0002] In seismic exploration, especially in the exploration of oil and gas reservoirs, complex fault block imaging and structural identification have become key factors. A series of geological risk factors such as the implementation of corresponding structural traps, reservoir carving, and accurate drilling into targets are all urgent considerations in actual exploration. Yes, this leads to two problems that geological exploration usually faces: imaging accuracy and structural distortion. [0003] Prestack depth migration is currently recognized as an effective method to solve seismic imaging, but its imaging accuracy largely depends on the rationality of the depth-velocity model. Therefore, tomographic imaging methods are usually ...

AI Technical Summary

Problems solved by technology

[0007] In view of the deficiencies in the prior art, one of the purposes of the present invention is to provide a velocity modeling method under a fault that eliminates the well-seismic seal, which can solve the problem of eliminating the well-seismic seal;

[0008] The second object of the present invention is to provide a processing terminal, which can solve the problem of eliminating well-seismic closure gap

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