An Elastic Prism Wave Reverse Time Migration Imaging Method Based on the Deconstruction Equation of P-S Wave in Curved Coordinate System

Abstract

The invention, which relates to the field of petroleum geophysical exploration, discloses an elastic prism wave reverse time migration imaging method based on a longitudinal and transverse wave deconstruction equation of a curved coordinate system. The method comprises: inputting longitudinal and transverse wave velocity fields, a multi-component actual observation gun record, an undulating surface elevation and an observation system file; generating an orthogonal body-fitted mesh according to the undulating surface elevation and transforming the longitudinal and transverse wave velocity fields into a curved coordinate system; calculating a P wave field and an S wave field of a prismatic wave source with forward extension under undulating surface condition; calculating a P wave field and an S wave field of a prismatic wave detection point with reverse extension under the undulating surface condition; calculating a multi-component imaging result of the prismatic wave in the curved coordinate system; transforming the multi-component imaging result of the prismatic wave in the curved coordinate system into one in a cartesian coordinate system; and outputting elastic prism wave reversetime migration imaging of a longitudinal and transverse wave deconstruction equation.

Description

technical field [0001] The invention relates to the field of petroleum geophysical exploration, in particular to an elastic prism wave reverse time migration imaging method based on the deconstruction equation of longitudinal and transverse waves in a curved coordinate system. Background technique [0002] The sharply undulating surface of the piedmont brings great difficulties to seismic imaging. Conventional seismic exploration uses reflected waves for imaging, but high and steep structures cannot be imaged. Therefore, high and steep structures can be imaged using prism wave information. Conventional prism wave imaging techniques are based on the acoustic wave approximation assumption to image single component seismic records , the shear wave information cannot be fully utilized. Contents of the invention [0003] The object of the present invention is to address the above-mentioned deficiencies, and propose a curved coordinate system-based longitudinal-short-wave syste...

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Problems solved by technology

[0002] Dramatic piedmont undulations make seismic imaging difficult

Conventional seismic exploration uses reflected waves for imaging, but high and steep structures cannot be imaged. Therefore, high and steep structures can be imaged using prism wave information. Conventional prism wave imaging techniques are based on the acoustic wave approximation assumption to image single component seismic records , unable to make full use of shear wave information

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