A Combined Primary and Multiple Wave Imaging Method with Full Path Compensation in Deep Sea Environment

Abstract

The invention discloses a full-path compensation primary wave and multiple wave joint imaging method in a deep sea environment, and specifically relates to the field of marine geophysical exploration. The present invention establishes the observation system by inputting the velocity field, the Q compensation parameter field and the actual observation shot records, and inputs the rough surface elevation of the seabed and the observation system file to generate an orthogonal body-fitting grid, and transforms the velocity field and the Q compensation parameter field into Curved coordinate system, based on the characteristics of the deep-sea environment, calculate the forward simulation operator of the full-path Q-compensated wave field under rough seabed conditions, the combined adjoint operator and de-migration operator of the primary wave and multiple waves, and construct the full-path Q-compensated primary wave The target functional of the joint imaging with multiple waves is calculated and the gradient is calculated, and the combined imaging results of the full path compensation primary wave and multiple waves in the curved coordinate system are calculated and transformed into the Cartesian coordinate system, and the imaging results are output. The invention eliminates the influence of undulating seabed surface, fully utilizes primary wave and multiple wave information, and improves imaging accuracy in deep sea environment.

Description

technical field [0001] The invention belongs to the field of marine geophysical exploration, and in particular relates to a combined imaging method for full-path compensation of primary waves and multiple waves in a deep sea environment. Background technique [0002] The geophysical exploration environment in the marine environment is relatively complex, the upper half is the seawater medium, and the lower half is the submarine subsurface medium, so the seismic wave attenuation and absorption phenomenon in the marine environment is also more complicated, and the double complex medium in the deep sea environment gives conventional seismic imaging This brings great difficulties. Conventional seismic exploration uses reflected waves for imaging. Due to the absorption and attenuation of the medium during the propagation of seismic waves, the imaging effect of seismic waves in the deep sea environment is greatly reduced, especially the imaging effect of the target layer under the ...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problem of severe attenuation of seismic waves in the marine environment and solve the problems of low-resolution shadow areas and poor imaging accuracy in the traditional imaging process, the present invention proposes a combination of full-path compensation primary waves and multiple waves in deep sea environments Imaging method, making full use of primary wave and multiple wave information to improve imaging accuracy in deep sea environment

Images