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

A technology of velocity modeling and closure difference, applied in the field of seismic exploration, can solve problems such as well-seismic closure difference, achieve the effect of improving accuracy, solving the error between seismic depth and well depth, and reducing exploration risk

Active Publication Date: 2020-06-05
GUANGZHOU MARINE GEOLOGICAL SURVEY +1
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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 sol

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

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[0042] Specific implementation plan

[0043] Hereinafter, the present invention will be further described with reference to the drawings and specific implementation schemes:

[0044] Such as Figure 1-Figure 13 As shown, a method for modeling velocity under a fault that eliminates the poor closure of wells and earthquakes includes the following steps:

[0045] Step 1: Obtain seismic data including shot line data. After the seismic data undergoes a sequence of conventional denoising processing in the time domain, a common center point gather is obtained, and the depth domain initial layer velocity model is established based on the common center point gather. The root mean square velocity in the time domain can be established through the CVI constrained velocity inversion method to establish a time domain initial layer velocity model that conforms to the law of geological velocity change, and the time depth (ie, time domain-depth domain) conversion is used to obtain the depth domain i...

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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 ...

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Application Information

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IPC IPC(8): G01V1/30
CPCG01V1/302G01V1/282G01V2210/512G01V2210/642G01V2210/66
Inventor 薛花李焕芝冯震宇张宝金文鹏飞张如伟陈玺
Owner GUANGZHOU MARINE GEOLOGICAL SURVEY
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