Cannon first-arrival comprehensive modeling static correction method without surface layer survey data constraint
A surface investigation and static correction technology, applied in the field of geophysical exploration, can solve problems such as low model accuracy, influence on static correction, and inability to obtain information, and achieve the effect of accurate structure, high precision and high imaging quality
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[0044] The present invention will be described in detail below with reference to the drawings and examples.
[0045] The present invention converts the well depth correction from the current wellhead time correction to the excitation depth correction, and then performs refraction analysis in the data domain of the geophone ground elevation and the shot point excitation surface elevation, first calculates the refraction velocity, and then calculates the shot point excitation height position At the same time, the tomographic inversion method is used to obtain the space velocity model within a certain depth range below the survey line surface, and the location of each detection point and shot point corresponding to the refraction velocity are extracted point by point. The model depth of is used as a constraint parameter for refraction modeling of the high-speed top interface, and the average surface velocity is calculated to establish a surface model, and finally the base static corr...
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