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Speed model establishment method

A technology of velocity model and establishment method, applied in seismic signal processing and other directions, can solve problems such as affecting the accuracy of imaging depth, and achieve the effect of ensuring accuracy

Active Publication Date: 2015-12-23
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

Therefore, the velocity model obtained by the above-mentioned prior art usually presents a step-like change in the vertical direction, which is inconsistent with the geological law that the formation velocity generally changes continuously, thus affecting the accuracy of imaging depth

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[0027] 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.

[0028] The following introduces the embodiment of the speed model establishment method of the present application. Such as figure 1 As shown, this embodiment includes the following steps:

[0029] S101: Acquire the root mean square velocity spectrum of the work area, and pick the root mean square velocity of a first area from the root m...

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Abstract

The invention discloses a speed model establishment method, comprising steps of obtaining a root-mean-square speed spectrum, picking up a first area root-mean-square speed from the root-mean-square speed spectrum, performing partitioning on a stratum of a work area according to the root-mean-square speed of the first area, obtaining the number of layers of the stratum and an initial depth and a gradient of each stratum, obtaining water speed of the work area, establishing a first speed model based on the water speed, performing pre-stack depth migration on the first speed model, obtaining a first interface of the work area, obtaining the second interface of the work area according to the first interface, with the second interface being an starting point, successively and downwardly calculate the layer speed of the first speed model based on the water speed of the work area, number of the layers of the stratum, initial depth of each stratum and the gradient, and embedding the first interface into the first speed model to obtain a second speed model. The speed model disclosed by the invention more accords with the geology rule, and improves the precision of the imaging depth.

Description

technical field [0001] The present application relates to the technical field of seismic data processing, in particular to a method for establishing a velocity model. Background technique [0002] In the process of oil and gas exploration, it is usually necessary to perform pre-stack depth migration processing on seismic data to obtain correct imaging of subsurface media, and an accurate velocity model is often the key to pre-stack depth migration. [0003] In the prior art, the method of establishing a velocity model is usually as follows: [0004] Obtain the layers and root mean square velocities interpreted in the time domain of the work area; calculate the layer velocities between reflection layers in the work area according to the layers and root mean square velocities, and obtain the initial velocity model; The domain horizons are converted layer by layer from top to bottom into depth domain horizons to obtain a velocity-depth model; pre-stack depth migration is perfo...

Claims

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Application Information

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IPC IPC(8): G01V1/28
Inventor 杨阳张红军沈阳李振勇张丹
Owner BC P INC CHINA NAT PETROLEUM CORP
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