Variable offset VSP converted shear wave one-way wave pre-stack depth migration method and device

Abstract

The invention discloses a variable offset VSP converted shear wave one-way wave pre-stack depth migration method and device. The method comprises the following steps: S1, inputting a variable-offset VSP common receiver point reflected and converted shear wave field, a P-wave two-dimensional geologic model, a shear wave two-dimensional geologic model and migration parameters; S2, according to the input data, establishing coordinates of a shot point and a receiver point in the two-dimensional geologic model; S3, for the time-space domain wave field of the reflected and converted shear waves, performing fast Fourier transform to a frequency wave number domain, and setting a frequency domain seismic source; S4, realizing one-way wave pre-stack depth migration imaging of a single receiver point; S5, completing variable offset VSP converted shear wave one-way wave pre-stack depth migration of all the receiver points; and S6, conducting common imaging gather superposition to acquire variableoffset VSP converted shear wave one-way wave pre-stack depth offset superposition imaging. According to the invention, variable offset VSP common receiver point one-way wave pre-stack depth migrationimaging is realized, variable offset VSP stack imaging is obtained, and data support is provided for well-side structure research and reservoir prediction.

Description

technical field [0001] The invention relates to seismic data migration imaging, in particular to a VSP converted shear wave one-way wave prestack depth migration method and device. Background technique [0002] Converted shear wave exploration is usually excited by a longitudinal wave source, received by a multi-component geophone, and simultaneously obtains longitudinal wave data and converted shear wave data. Converted shear wave data are mainly used for structural imaging, lithology identification, elastic parameter inversion and fracture development prediction, etc. [0003] Variable offset VSP means that an array composed of multiple geophones is placed in the observation well, and a shot line composed of artificially excited multiple shot points is arranged on the surface. It is a two-dimensional observation method of VSP. Under the condition of the data, the data acquisition in the VSP well with variable offset distance is realized. The three-dimensional diagram of t...

AI Technical Summary

Problems solved by technology

However, research on variable offset VSP migration imaging mainly focuses on time-domain P-waves and depth-domain P-waves, with few converted S-waves.

Images