Application of True Surface Velocity Modeling Technology to Imaging of Seismic Data in Complex Mountainous Areas

doi:10.7657/XJPG20240214

Abstract

Abstract:

Conventional pre-stack depth migration imaging techniques separate the migration imaging and static correction processing. In the processing of seismic data from complex mountainous areas, due to the factors such as complex surface condition, drastic lateral velocity variation near the surface, and exposure of high-velocity interval, the static correction based on the assumption of surface consistency may cause wave field distortion. This distortion leads to big errors in calculation of travel time, affecting the effects of depth migration imaging. To solve this problem, a full-depth modeling and imaging technique based on true surface migration was proposed. This technique starts with velocity modeling and travel time calculation from the surface elevation, and addresses static correction implicitly in the migration imaging process. It has been satisfactorily applied in the processing of complex mountainous data.

Key words: complex mountainous area, static correction, first-arrival tomography, microlog, true surface, velocity modeling, wavefront construction, ray density

CLC Number:

P631.4

PENG Gengxin, GU Xiaodi, DUAN Wensheng, GONG Ting, ZHAO Ruirui, WANG Qing. Application of True Surface Velocity Modeling Technology to Imaging of Seismic Data in Complex Mountainous Areas[J]. Xinjiang Petroleum Geology, 2024, 45(2): 244-252.

Figures/Tables 13

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