Full-path compensation primary wave and multiple wave combined imaging method in deep sea environment

Abstract

The invention discloses a full-path compensation primary wave and multiple wave combined imaging method in a deep sea environment, and particularly relates to the field of marine geophysical exploration. The method comprises the following steps: establishing an observation system by inputting a speed field, a Q compensation parameter field and an actual observation gun record, inputting a seabed rugged surface elevation and an observation system file, generating an orthogonal skin grid, and converting the speed field and the Q compensation parameter field into a curved coordinate system; calculating a forward modeling operator, a primary wave and multiple wave joint accompanying operator and a demigration operator of a full-path Q compensation wave field under a rugged seabed condition based on deep sea environment characteristics, constructing a target functional of full-path Q compensation primary wave and multiple wave joint imaging, and solving a gradient; and calculating a full-path compensation primary wave and multiple wave combined imaging result under a curved coordinate system, converting the result into a Cartesian coordinate system, and outputting an imaging result. Theinfluence of the fluctuating seabed surface is eliminated, the primary wave and multiple wave information is fully utilized, and the imaging precision in the deep sea environment is improved.

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 ...

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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

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