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Dynamic-matching dynamic-correction method

A dynamic matching and dynamic correction technology, which is applied in the field of seismic exploration, can solve the problems of inaccurate focus of velocity spectrum energy values, reduced velocity picking accuracy, and inaccuracy, so as to improve stacking effect and velocity inversion, and eliminate wavelet waves. stretching effect

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

The commonly used velocity spectrum picking method often has inaccurate and inaccurate focus of the velocity spectrum energy value, which reduces the accuracy of velocity picking

Method used

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Embodiment Construction

[0026] First of all, before describing the embodiments of the present application, it is necessary to introduce a dynamic time correction method (DTW), which can be used for seismic signals f(i) and g( i) Calculate its time error u(0:N-1), the formula used is:

[0027] |u[i]-u[i-1]|≤1

[0028] |u[i]|≤L

[0029] i=0,1,...N-1; (3)

[0030] Among them, u(0:N-1) represents an optimal solution of time-matching moveout, and N is the length of seismic signals f(i) and g(i).

[0031] When u[i]-u[i-1]=1, two adjacent points in f(i) correspond to two non-adjacent points in g(i). When u[i]-u[i-1]=-1, two adjacent points in f(i) correspond to one point in g(i). Because two similar seismic waves do not change very sharply, the limitation of formula (3) has practical geological significance. The process carried out in the steps of this application is all carried out under the restriction of formula (3).

[0032] The technical means adopted by the present invention to achieve the inten...

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Abstract

The invention discloses a dynamic-matching dynamic-correction method, and the method comprises the steps: obtaining raw seismic data of CMP or CIP seismic channels of N sampling points of each of M seismic channels, and selecting the seismic channel with a zero offset distance; calculating and obtaining a forward error of a channel direction and a reverse error of the channel direction; carrying out the smoothening of the channel direction, and calculating and obtaining a smoothening error of the channel direction of M seismic channels; enabling the smoothening error of the channel direction to serve as new seismic data which has M seismic channels, wherein each seismic channel has N sampling points, carrying out transposition, and calculating a direction smoothening error of the sampling points; enabling the direction smoothening error of the sampling points to serve as seismic data, carrying out transposition, and obtaining the forward error of the channel direction after the smoothening of raw seismic data; calculating and obtaining time difference between the zero offset distance seismic channel of the raw seismic data and each of M seismic channels, and correcting the time differences of all channels in the raw seismic channel through the time difference, obtaining a time difference field, and carrying out dynamic correction through the time difference field.

Description

technical field [0001] The invention relates to the technical field of seismic exploration, in particular to a dynamic matching and dynamic correction method. Background technique [0002] In seismic data processing, motion correction technology is a very common method. Initially, the conventional motion correction was based on the hyperbolic time distance equation (Dix, 1955), and it was performed point by point. However, at large offsets, the seismic wave time distance Curves are not hyperbolic. Afterwards, Taner and Koehler (1969) used the first three terms of Taylor series expansion to make a fourth-order correction of normal jet lag, which improved the accuracy of the approximate formula. Tsvankin and Thomsen (1994) gave a long-offset dynamic correction formula for horizontal single-layer anisotropic media. Conventional dynamic correction with a large offset will cause serious stretching of the wavelet. Usually, we directly cut off the severely stretched area and fill...

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Application Information

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IPC IPC(8): G01V1/36
Inventor 陈双全靳松李向阳
Owner BC P INC CHINA NAT PETROLEUM CORP
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