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Method for multi-wave continuum speed analysis

A technology of velocity analysis and medium, applied in seismic signal processing and other directions, it can solve problems such as difficult human-computer interaction processing, large errors, and inability to solve large offset distances well.

Inactive Publication Date: 2015-06-03
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

The approximate form of conventional hyperbolic travel time has a large error, and the Taylor expansion method is used to express its travel time in the form of a high power of offset. Although this method has higher accuracy than the hyperbolic form at close offsets, it is also Doesn't handle large offsets well
Generally more than six times, it is difficult to improve the fitting accuracy
The high-order power method can only improve the fitting accuracy within a certain offset range, but the high-order curve is greatly affected by the calculation interception error, and the high-order form needs to obtain more parameters in actual production, which is difficult for human-computer interaction processing

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  • Method for multi-wave continuum speed analysis
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  • Method for multi-wave continuum speed analysis

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Embodiment Construction

[0056] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0057] The invention uses the equivalent continuous velocity model and the principle of virtual seismic source to approximate the converted wave travel time, improve the accuracy of large offset dynamic correction, provide high-quality converted wave prestack dynamic correction gathers, and provide AVO with large offset data. Inversion lays the groundwork. Usually the converted wave correction is to correct the seismic records to the vertical travel time of the converted wave. The present invention combines the analysis of the longitudinal wave velocity and the converted wave velocity to directly correct the converted wave data to the vertical travel time of the longitudinal wave to realize the comparison of the converted wave and the longitudinal wave horizon.

[0058] According to the theory of seismic wave propagation, the total propagation time and offset of layer...

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Abstract

The invention provides a method for multi-wave continuum speed analysis, and belongs to the field of oil and gas geophysics. The method comprises the following steps of (1) performing continuum speed analysis on a longitudinal wave common center point gather or a conversion wave common conversion point gather, and generating a continuum speed field; (2) when the travel of each of the longitudinal wave common center point gather or the conversion wave common conversion point gather is calculated, performing continuum speed dynamic correction on a longitudinal wave or conversion wave pre-stack gather, and correcting to the vertical traveltime t0.

Description

technical field [0001] The invention belongs to the field of oil and gas geophysics, and in particular relates to a multi-wave continuum velocity analysis method. Background technique [0002] Velocity analysis and dynamic correction technology is a key link in seismic data processing. Reflected wave time distance equation is the basis of velocity analysis and dynamic correction technology, and its accuracy affects the effect of velocity analysis and dynamic correction. Dix's (1955) hyperbolic approximate traveltime equation for reflected waves is widely used in velocity analysis, motion correction and superposition. Tarner and Koehler (1969) used Taylor series to express the travel time of seismic reflection waves in horizontally layered isotropic media as high-order polynomials. May and Straley (1979) realized the speed analysis method in the form of quartic polynomial by step-sweeping two parameters. Sun et al. (2002), Hu Zhongping (2003) gave the NMO method for optimiz...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
Inventor 魏修成陈天胜季玉新刘兰锋谢飞陈冬张春涛
Owner CHINA PETROLEUM & CHEM CORP
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