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Iterative method for calculating average velocity of seismic wave rays in horizontal layered medium

An average velocity and horizontal layer technology, applied in the field of seismic exploration, can solve problems such as not considering horizontal changes

Active Publication Date: 2020-12-04
LIAONING TECHNICAL UNIVERSITY
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Problems solved by technology

[0013] Based on the fact that the calculation of the average velocity in the horizontal layered medium does not consider the horizontal change, an iterative method for calculating the average velocity of seismic wave rays in the horizontal layered medium is proposed

Method used

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  • Iterative method for calculating average velocity of seismic wave rays in horizontal layered medium
  • Iterative method for calculating average velocity of seismic wave rays in horizontal layered medium
  • Iterative method for calculating average velocity of seismic wave rays in horizontal layered medium

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Embodiment Construction

[0049] Calculating the average velocity of seismic wave rays in the horizontal layered medium by iterative method for the Cenozoic strata in a plain area, and exploring the depth of the target layer, not only illustrates the implementation of the present invention to determine the average velocity of rays, but also studies the exploration effect of the average velocity of rays. Overview such as image 3 shown.

[0050] An iterative method for calculating the average velocity of seismic wave rays in a horizontal layered medium, the implementation flow chart is as follows Figure 4 shown. The specific process is as follows:

[0051] Step 1: Drill holes in the horizontal layered isotropic continuum exploration area to reach the target layer;

[0052] Step 2: Determining the Layer Thickness of Horizontal Layered Media Using Seismic Logging Methods and layer speed , to obtain layer thickness and layer velocity data, as shown in Table 2, i=1,2,3...,n, i is the sequence number...

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Abstract

The invention provides an iterative method for calculating the average velocity of seismic wave rays in a horizontal layered medium. The method comprises the steps: drilling a hole in a horizontal layered isotropic continuous medium exploration region, and performing drilling to a target layer; determining the layering thickness and the layering speed of the horizontal layered medium by using a seismic logging method; arranging longitudinal measuring lines, and determining offset distances of recording points; determining a ray constant through iterative operation; and determining the ray average speed using a ray constant. At present, the average speed in seismic exploration only reflects the change along with the depth, and the change of the average speed in the horizontal direction is not considered, so that errors are generated in the seismic exploration due to offset change and exploration results, and when the offset is large, large errors are often generated. According to the method, on the premise that the geophone offset is determined, iterative operation is carried out by taking the ray constant as a variable, and after the ray constant is determined, the ray average speed under the condition that the geophone offset is determined can be calculated. The average speed of the rays is closer to the real propagation speed of seismic waves, so that the exploration result is more accurate.

Description

technical field [0001] The invention belongs to the technical field of seismic exploration, in particular to an iterative method for calculating the average velocity of seismic wave rays in a horizontal layered medium. Background technique [0002] Seismic wave propagation velocity is one of the most important and basic parameters in seismic exploration. When performing time-depth conversion, the average velocity is used. The average velocity is defined as the ratio of the total thickness of the layered medium to the travel time of the seismic wave in the direction perpendicular to the stratum in the case of a multi-layer medium; when performing migration and other processing, it is used The average ray velocity, the average ray velocity is defined as the ratio of the total distance traveled by the seismic wave along a certain ray to the time it takes; when performing motion correction processing or hyperbolic fitting involving the measured time-distance curve, the stacking ...

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Application Information

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IPC IPC(8): G01V1/30
CPCG01V1/303G01V1/306G01V2210/6222
Inventor 李启成苑树鹏郑新娟闵也贺翔吴奎肖艳妃王明成徐伊豪
Owner LIAONING TECHNICAL UNIVERSITY
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