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Common converted point (CCP) gathering method

A technology of converting points and converting waves, which is applied in seismic signal processing and other directions, can solve problems such as poor precision and slow speed, and achieve the effect of improving processing efficiency and precision

Inactive Publication Date: 2011-02-02
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0011] In view of the slow speed and poor precision of the CCP superimposed imaging method in the prior art, the present invention is made. For this reason, the main purpose of the present invention is to provide a CCP extraction method, wherein:

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Embodiment Construction

[0024] The core idea of ​​the present invention is to firstly calculate the intersection point between the connection line of the shotgun point and the CCP surface element, and map the depth of the reflection point according to the intersection point, and obtain the velocity ratio of the depth point according to the velocity spectrum in the depth domain, thereby using the double square root equation to obtain the input directly map a section of data to the CCP bin, and correct the non-hyperbolic time-distance relationship into a hyperbolic time-distance relationship during the mapping process, then the subsequent velocity analysis can be directly analyzed by the longitudinal wave velocity analysis method Equivalent root mean square velocity: use the root mean square velocity of the longitudinal wave in the depth domain and the converted wave to convert it into the root mean square velocity ratio, and then use the precise velocity ratio to extract the CCP gathers, correct the non...

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Abstract

The invention discloses a common converted point gathering method which comprises the following steps of: calculating the depth of a converted point according to the intersection point of a connection line between a shooting point and a geophone and a CCP bin; obtaining the velocity ratio of the converted point according to the depth domain velocity spectrum of the depth of the converted point; calculating the reflection time period of the converted wave of an input channel according to the velocity ratio of the converted point; mapping earthquake data received within the reflection time period to the CCP bin, wherein a non-hyperbolic travel time relationship is corrected into a hyperbolic travel time relationship in the mapping process; and generating hyperbolic accurate velocity ratio CCP gathering. By the invention, processing efficiency and accuracy can be improved.

Description

technical field [0001] The invention relates to the imaging field of multi-component converted wave seismic data, in particular to a common converted point (CCP, Common Converted Point profile) gather method. Background technique [0002] In the field of imaging technology of multi-component converted wave seismic data, the main research methods include the following three aspects: converted wave CCP stack imaging, converted wave pre-stack (post-stack) time, converted wave pre-stack (post-stack) depth migration. [0003] Among them, the main problem of CCP superposition imaging of converted waves is: the asymmetry of the up-going and down-going waves of converted waves makes the conventional velocity analysis, motion correction and horizontal stacking techniques based on common midpoint (CMP) gathers unsuitable for converted waves. wave, converted wave imaging must study new techniques. At present, the research on technical methods in this area has developed to a certain ex...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/36
Inventor 王赟芦俊
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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