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Speed model updating method, computer storage medium and computer system

A technology of velocity model and update method, applied in measurement devices, instruments, scientific instruments, etc., to avoid velocity inversion deviation, improve accuracy, and improve accuracy

Pending Publication Date: 2021-03-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: conventional automatic pick-up of residual time difference, coherent scanning based on data drive, controlling the event to be picked up by parameters such as curvature, coherence, residual depth difference, and picked-up depth range

Method used

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  • Speed model updating method, computer storage medium and computer system
  • Speed model updating method, computer storage medium and computer system
  • Speed model updating method, computer storage medium and computer system

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Embodiment 1

[0036] figure 1 A flow chart of a method for updating a speed model according to an embodiment of the present invention is shown. like figure 1 As shown, the speed model updating method according to the embodiment of the present invention mainly includes steps S101 to S108.

[0037] In step S101, the geological horizon is determined.

[0038] Specifically, the geological horizon is determined according to the well logging curve and geological stratification data.

[0039] In step S102, according to the geological horizon, the common imaging point gather, and the depth domain migration profile corresponding to the velocity model to be updated, the depth range of the multiple wave development is determined.

[0040] In step S103, the depth domain horizon information corresponding to the geological horizon is obtained according to the depth range of the multiple wave development and the depth domain migration profile corresponding to the velocity model to be updated.

[0041]...

Embodiment 2

[0054] figure 2 A flow chart of a method for updating a speed model according to Embodiment 2 of the present invention is shown. like figure 2 As shown, the speed model update process in the embodiment of the present invention specifically includes the following steps.

[0055] Step 1: Determine the geological horizon according to the logging curve information and the geological stratification data.

[0056] Step 2: Denoising, removing multiples and the like are performed on the depth gathers of the common imaging points to improve the signal-to-noise ratio of the depth gathers of the common imaging points.

[0057] Step 3: Combine the geological horizon information in Step 1, the depth gathers of common imaging points optimized in Step 2, and the depth domain migration profile to identify the depth range of the development of residual multiples.

[0058] Step 4: According to the multiple development depth information obtained in step 3, select several sets of geological ...

Embodiment 3

[0066] This embodiment provides a computer storage medium in which a computer program is stored, and when the computer program is executed by one or more processors, the speed model updating method described in the first embodiment or the second embodiment is executed.

[0067] This embodiment also provides a computer system, the computer system includes a processor and a memory storing a computer program, the processor executes the speed model according to the first embodiment or the second embodiment when executing the computer program Update method.

[0068] Here, the speed model update method involved in the first embodiment includes the following steps:

[0069] determine the geological horizon;

[0070] According to the geological horizon, the common imaging point gather and the depth domain migration profile corresponding to the velocity model to be updated, determine the depth range of the multiple wave development;

[0071] According to the depth range of the multip...

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Abstract

The invention discloses a speed model updating method, a computer storage medium and a computer system. The method comprises the steps of determining a geological horizon; determining a depth range ofmultiple wave development according to the geological horizon, the common imaging point gather and the depth domain migration profile; obtaining depth domain horizon information according to the depth range of multiple wave development and the depth domain migration profile; importing the depth domain horizon information into a common imaging point gather, automatically picking up a first residual time difference and a second residual time difference, and picking up a third residual time difference layer by layer for stratums located below the shallow layer of the geological horizon and abovethe deep layer of the geological horizon; and establishing a three-dimensional chromatography equation according to each residual time difference, carrying out grid chromatography inversion, and outputting a qualified speed model after grid chromatography inversion as an updated speed model. According to the invention, horizon information is introduced into a multiple wave development area, the residual time difference is compulsorily tracked along the horizon, and the precision of speed inversion can be improved.

Description

technical field [0001] The invention belongs to the field of seismic data processing, in particular to a high-precision velocity model updating method, and also relates to a computer storage medium and a computer system storing the velocity model updating method. Background technique [0002] The velocity problem is the core problem of exploration seismology. For any migration method, the correctness of the velocity model is a key factor in determining the quality of structural imaging, especially the prestack depth migration is more dependent on the velocity model and more sensitive to the response. , higher requirements. Establishing a prestack depth migration velocity model generally includes five processes: structural modeling, initial velocity modeling, target line migration imaging, model optimization iteration and update, and final prestack depth migration volume migration. Iteratively picks the residual time difference based on the common imaging point gather, and u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30G01V1/28
CPCG01V1/303G01V1/282G01V1/301
Inventor 金红娣刘小民陈胜红任艺
Owner CHINA PETROLEUM & CHEM CORP