Vector prestack depth migration based on Kirchhoff integral equation

RONG Junzhao1 LU Jun1 LI Jianfeng2 WANG Chengxiang2

(1.School of Energy, China University of Geosciences (Beijing), Beijing, China 100083)
(2.Geophysical Research and Development Department, BGP Inc., CNPC, Zhuozhou, Hebei, China 072750)

【Abstract】Conventional Kirchhoff integral migrations lead to inaccurate multi-component seismic imaging and cannot preserve true amplitude due to the scalar acoustic wave equation basis. In this paper, we put forward a vector prestack depth migration based on Kirchhoff integral equation. First we deduce Kirchhoff integral vector migration formula based on multi-component seismic vector field and homogeneous isotropic elastic wave equation. Then we apply it to the prestack depth migration of multi-component seismic data. Using wave equation vector characteristics, we recover leaked seismic information PP- and PS-wave components in the migration, and achieve PP- and PS-wave separations. The tests on 2D numerical model and real data prove that the proposed method can eliminate the mode leak and increase the imaging accuracy.

【Keywords】 prestack depth migration; Kirchhoff integral; vector; multi-component;

【DOI】

【Funds】 National Natural Science Foundation of China (41604119, 41425017, 41374131, 41574126 and 41504107) “Cooperative Research of Elastic-wave Seismic Imaging Technology” of CNPC

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This Article

ISSN:1000-7210

CN: 13-1095/TE

Vol 52, No. 06, Pages 1170-1176+1118

December 2017

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Article Outline

Abstract

  • 1 Introduction
  • 2 Vector Kirchhoff prestack depth migration
  • 3 Model data test
  • 4 Real data processing
  • 5 Conclusions and discussion
  • References