Selecting spatial samples based on seismic migration of dip formation

CAI Xiwei1 HE Baoqing1 ZHANG Yang1 WANG Yan1 TANG Donglei1

(1.Acquisition Technique Center, BGP, CNPC, Zhuozhou, Hebei Province, China 072751)

【Abstract】The spatial sampling interval is an important parameter for seismic data acquisition and processing. At the moment, the formula for calculating spatial sampling intervals only considers the aliasing-free samples of reflected waves, or diffracted waves in the migration aperture, but it is not suitable for the imaging requirements of dip formations. In this paper, the time-distance equation of reflected wave is established based on the essence of seismic migration imaging and the distribution characteristics of diffracted wavefield. Then the spatial sampling formula for migration imaging of dip formations is derived based on the principle of seismic wave inphase superposition, and finally, the spatial sampling of seismic imaging with different dips and frequencies is analyzed. The result provides a reliable basis of spatial sampling selection for seismic data acquisition design and migration imaging.

【Keywords】 spatial sampling; dip formation; diffracted wavefield; time-distance equation of reflected wave; in-phase stacking;

【DOI】

【Funds】 Scientific Research Project of BGP, CNPC (06-02-2019)

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This Article

ISSN:1000-7210

CN: 13-1095/TE

Vol 55, No. 05, Pages 973-978+930

October 2020

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Article Outline

Abstract

  • 1 Introduction
  • 2 Derivation of spatial sampling of seismic waves
  • 3 Synthetic seismogram
  • 4 Conclusions
  • References