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Anisotropy speed analysis and dynamic correction method

An anisotropy and velocity analysis technology, applied in seismic signal processing and other directions, can solve problems affecting the accuracy of velocity analysis

Active Publication Date: 2010-07-14
PETROCHINA CO LTD +1
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Problems solved by technology

The accuracy of the velocity analysis is affected due to the stretching of the motion correction

Method used

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Embodiment Construction

[0031] (1) Seismic data preparation, including raw seismic data reading, seismic data editing, observation system loading and preprocessing, etc.; (common sense of seismic data processing)

[0032] (2) Sorting CMP seismic data gathers; (common sense of seismic data processing)

[0033] (3) The range of small offset (usually about 1 times the depth of the reflection interface), the velocity analysis window length (usually half to one time of the main period of the seismic wavelet), and the step size (usually one sampling interval to half the window length), the hyperbolic velocity analysis method is adopted to analyze the velocity without stretching influence, and the hyperbolic velocity of the reflected wave is obtained by interactive interpretation of the velocity spectrum;

[0034] (4) According to the round-trip time of reflected waves, hyperbolic velocity and offset range, the layer velocity is calculated by using the non-stripping layer optimization method;

[0035] (5) ...

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Abstract

The invention relates to a high-precision anisotropy speed analysis and a dynamic correction method, which comprise the following steps: preparation of seismic data: CMP seismic data gather is sorted; hyperbolic equation is adopted to perform the speed analysis without stretching influence on the small geophone offset reflected wave data; interactive interpretation is performed for velocity spectrum so as to obtain the hyperbolic velocity of the reflected wave; interval velocity is calculated with a non-delamination optimization method according to the two-way time and the hyperbolic velocity of the reflected wave; an exclusive interval velocity is calculated according to a least squares optimization principle; a vertical root mean square velocity is calculated; all geophone offset data is used for performing the anisotropy speed analysis without the stretching influence to obtain the anisotropy parameters; higher-precision root mean square and anisotropy parameters are calculated; anisotropy dynamic correction is performed; the calculation of the vertical root mean square velocity is automatically completed according to the calculated hyperbolic velocity and the offset range so as to perform the anisotropy velocity analysis and dynamic correction. The parameters obtained by calculating are free from being influenced by the dynamic correction stretching and have the advantages of high precision and high efficiency.

Description

technical field [0001] The invention relates to a method for anisotropic velocity analysis and dynamic correction in order to obtain high-precision velocity structure and imaging section in oil and gas geophysical prospecting seismic data processing. Background technique [0002] In seismic data processing, velocity analysis and dynamic correction are very important, and their accuracy directly affects the imaging accuracy of seismic data, so obtaining high-precision velocity structure and imaging profile has always been a research hotspot. Conventional seismic data processing methods generally use hyperbolic equations to describe the travel time of reflection waves. As the length of the array increases, the accuracy of this hyperbolic equation decreases, and the error becomes larger as the formation non-quality increases. Since the actual formation is heterogeneous and anisotropic, the time-distance curves on the common midpoint gathers often show non-hyperbolic characteris...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/30G01V1/36
Inventor 刘洋李国发彭更新黄录忠
Owner PETROCHINA CO LTD
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