Seismic wave joint imaging method and system

Abstract

The invention discloses a seismic wave joint imaging method and system. The seismic wave joint imaging method can comprise the steps of for an inclination angle domain common imaging point gather, separating diffraction energy and reflection energy in the inclination angle domain common imaging point gather, and thus obtaining a diffraction energy gather and a reflection energy gather; obtaining anormalization factor through normalization processing based on the diffraction energy gather and the reflection energy gather; performing stack imaging on the diffraction energy gather and the reflection energy gather to obtain a diffraction energy imaging profile and a reflection energy imaging profile; and obtaining a joint imaging profile based on the diffraction energy imaging profile, the reflection energy imaging profile and the normalization factor. The seismic wave joint imaging method can simultaneously represent a reflector and a diffractor more clearly and more accurately through joint imaging of reflected waves and diffracted waves.

Description

technical field [0001] The present invention relates to the technical field of oil and gas geophysics, and more specifically, to a seismic wave joint imaging method and system. Background technique [0002] The energy result of the seismic signal can be represented in the reflected energy or the diffracted energy. In the reflected seismic data, the reflected wave is the reflection of the interface shape of the underground layered strata, which is mainly characterized by continuity, while the diffracted wave It reflects the important information of irregular anomalies in the underground medium, mainly manifested as discontinuity features, such as pinch-out of sand bodies, unconformities, large-scale faults, and small-scale geological anomalies such as holes, caves, and fractures (Khaidukov, 2003 ). For the identification and description of these irregular geological anomalies, especially for the understanding of complex heterogeneous carbonate karst fracture-cavity reservoir...

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Problems solved by technology

However, these studies are mostly carried out in the pre-stack migration in the depth domain, and the velocity modeling in the necessary steps in the depth domain is very expensive, the calculation efficiency is low, and it is difficult to obtain it accurately (Wang Huazhong et al., 2012)

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