Ellipse expansion imaging method and device of seismic data processing under complicated ground surface condition

Abstract

The invention discloses ellipse expansion imaging method and device of complex seismic data processing under the condition of a true ground surface, belonging to the technical field of reflection seismic data processing in seismic exploration. The method comprises the following steps of calculating a position coordinate of a reflection point and a position coordinate of an exposure point of a normal line of the reflection point on an offset line according to a position coordinate of a shot point, a position coordinate of a receiver point, a position coordinate of a virtual image point and a position coordinate of a preset imaging position point; calculating a position coordinate of the corrected shot point and a position coordinate of the corrected receiver point according to a preset datum plane, a linear equation of the offset line and a position coordinate of the preset imaging position point; calculating travelling times between the shot point and a corrected shot point, the receiver point and the corrected receiver point as well as the exposure point and the preset imaging position point according to speeds of media of the position coordinate of the shot point, the position coordinate of the receiver point, the position coordinate of the exposure point, the position coordinate of the corrected shot point, the position coordinate of the corrected receiver point, the preset imaging position point and the preset datum plane, and obtaining a zero-offset time section by carrying out ellipse expansion tangental interference and superposition according to the travelling times.

Description

technical field [0001] The invention relates to the technical field of reflection seismic data processing in seismic exploration, in particular to an ellipse expansion imaging method and device for seismic data processing under complex surface conditions. Background technique [0002] With the continuous development of seismic exploration, imaging technology in seismic data processing is becoming more and more advanced. Among them, the ellipse expansion imaging method has been widely used because it can obtain the zero-offset time section of any curved interface under the condition of uniform medium, and can obtain the superimposed velocity field of CRP (Common Reflection Point) with practical geological significance. Applications. [0003] The existing ellipse expansion imaging method assumes that the surface is a horizontal surface, under a certain velocity distribution, the signals of seismic records are "spread" along the elliptical trajectory to the isochrone, and the ...

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Problems solved by technology

[0006] In order to solve the problem of complex surface and complex structure imaging, the embodiment of the present invention provides an ellipse expansion imaging method and device for seismic data processing under complex surface conditions

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