Prestack amplitude preservation focusing and imaging technology for specific geologic body underground

Abstract

The invention belongs to a geophysical exploration technology, and relates to a prestack amplitude preservation focusing and imaging technology for a specific geologic body underground. According to the invention, seismic data is acquired, conventional processing such as prestack noise elimination, de-convolution and first arrival blanking, and a geologic body at a specific depth underground can be accurately imaged by using the prestack amplitude preservation focusing and imaging technology. A corresponding focusing parameter can be estimated according to the spatial position of the specific geologic body underground, the focusing parameter is applied to prestack amplitude preservation focusing offset for the geologic body, and an accurate imaging result can be acquired. Provided by the invention is a high-precision imaging method for the specific geologic body underground, a problem that special geologic bodies such as a salt dome, a buried hill and a fracture at the medium depth underground are difficult to be imaged is solved, geometric diffusion effects in seismic wave propagation can be eliminated, and an offset section with relatively preserved amplitude is acquired.

Description

technical field [0001] The invention relates to seismic data processing, in particular to the pre-stack amplitude-preserving focus migration imaging technology for specific underground geological bodies. Background technique [0002] In recent years, the beam migration technology with the combined advantages of Kirchhoff and wave equation migration has attracted extensive attention from scholars at home and abroad. The typical ones are the Gaussian beam migration method proposed by Hill(1990), Hill(2001), Gray(2005), Gray(2009), etc. This method not only has the flexible adaptability of Kirchhoff migration to irregular observation systems, but also It has an accuracy comparable to that of wave equation imaging. However, in Gaussian beam migration, the effective half-width of the beam increases hyperbolicly with the increase of the ray path, which greatly reduces the imaging accuracy at complex underground geological bodies (salt domes, ancient buried hills, craters, etc.) ...

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Problems solved by technology

However, in Gaussian beam migration, the effective half-width of the beam increases hyperbolicly with the increase of the ray path, which greatly reduces the imaging accuracy at complex underground geological bodies (salt domes, ancient buried hills, craters, etc.) , many scholars at home and abroad have also done a lot of research on this problem, such as complex-valued beam migration, Gaussian beam linear inversion, etc., but these methods are in the initial stage of research, and have not yet solved the target of complex geological bodies. imaging problem

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