Method and device for determining pre-stack time migration velocity field

A pre-stack time migration and velocity field technology, which is applied to measuring devices, instruments, scientific instruments, etc., can solve the problems of low accuracy and low accuracy of pre-stack time migration velocity field

Active Publication Date: 2017-05-31
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

figure 1 Shows the coverage times of reflection points in the seismic data of the very shallow layer in the target work area in the prior art, refer to figure 1 , the number of reflection points in the seismic data on the very shallow layer in the tar...

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  • Method and device for determining pre-stack time migration velocity field
  • Method and device for determining pre-stack time migration velocity field
  • Method and device for determining pre-stack time migration velocity field

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Embodiment Construction

[0067] Embodiments of the present application provide a method and device for determining a prestack time migration velocity field.

[0068] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0069] figure 2 is a flow chart of an embodiment of a method for determining a prestack time migration velocity field in this application. Such as figure 2 As shown, the method for determining the pres...

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Abstract

The embodiments of the invention disclose a method and a device for determining a pre-stack time migration velocity field. The method comprises the following steps: acquiring seismic data, first arrival wave data and vertical seismic profile data of a target work area and near-surface acquisition information corresponding to an extremely shallow layer in the target work area, wherein the target work area includes the extremely shallow layer, a middle-shallow layer, and a middle-deep layer; determining the initial root-mean-squared velocity field on the extremely shallow layer according to the first arrival wave data or the near-surface acquisition information; determining the initial root-mean-squared velocity field on the middle-shallow layer according to the vertical seismic profile data; determining the initial root-mean-squared velocity field on the middle-deep layer based on the initial root-mean-squared velocity field on the middle-shallow layer; and acquiring well hierarchy data on a marker layer in the target work area, and determining the target root-mean-squared velocity field on the target work area according to the initial root-mean-squared velocity fields on the extremely shallow layer, on the middle-shallow layer and on the middle-deep layer and the well hierarchy data. The accuracy of the pre-stack time migration velocity field determined can be improved.

Description

technical field [0001] The present application relates to the technical field of seismic data processing, in particular to a method and device for determining a pre-stack time migration velocity field. Background technique [0002] As the requirements for seismic exploration accuracy are getting higher and higher, pre-stack time migration processing has become an important means to realize accurate imaging of complex hidden structural areas. The quality of imaging results obtained through prestack time migration processing mainly depends on the accuracy of the established prestack time migration velocity field. Therefore, before prestack time migration processing, it is necessary to establish a Prestack time migration velocity field is an urgent problem to be solved. [0003] The main process of the method for determining the prestack time migration velocity field in the prior art is as follows: obtain the seismic data of the target work area, determine the stacked velocity...

Claims

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Application Information

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IPC IPC(8): G01V1/30
CPCG01V1/303G01V2210/512
Inventor 张红军于明张丹董庆宇
Owner BC P INC CHINA NAT PETROLEUM CORP
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