Development and Application of Velocity Modeling Method Based on Double Square Root Operator

doi:10.7657/XJPG20230117

Abstract

Abstract:

The southern margin of the Junggar Basin is a mountainous area with severe surface fluctuations. The conventional seismic processing method cannot meet the needs of the assumptions of the processing method due to the actual geological structure of the surface and deep layers，resulting in an unsatisfactory imaging effect and a large error between the interpreted depth and the measured drilling depth. In order to improve the quality of seismic data processing in the area，a seismic data processing method based on rugged datum was explored by using the velocity modeling with double square root operator. The method can reduce the distortion of wave field caused by the horizontal datum correction of the common midpoint (CMP) gather and provide a velocity field similar to the real observation surface for pre-stack migration，thus realizing the efficient integration of the time-domain datum and the depth-domain datum. The actual application of the new method show good seismic data processing results，with accurate migration imaging homing，satisfactory focusing，and significantly reduced error between the depth obtained from seismic interpretation and the depth measured by drilling. The new method provides a reference for seismic data processing in similar mountainous areas.

Key words: Junggar basin, southern margin, migration imaging, double square root operator, datum, mountainous area, velocity modeling

CLC Number:

TE132.14

Alifjian REHMTULY, PAN Long, LI Xianmin, LIN Juan, MA Jingjing, DOU Qiangfeng. Development and Application of Velocity Modeling Method Based on Double Square Root Operator[J]. Xinjiang Petroleum Geology, 2023, 44(1): 119-124.

Figures/Tables 6

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