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Pre-Stack Migration Velocity Analysis Based on Sequent Optimization of Common Scattering Point Gathers and Angle Domain Common Imaging Gathers

Qin Ning1, Li Zhenchun1, Yang Xiaodong2, Zhang Kai1, Wang Jun3   

  1. 1.School of Geoscience, China University of Petroleum, Qingdao266580, Shandong, China;
    2.Petroleum Development Center, Shengli Oilfield, Dongying257000, Shandong, China;
    3.Exploitation Geological Institute of No.1 Oil Plant, Qinghai Oil Field, Mangya816400, Qinghai, China
  • Received:2012-05-16 Online:2013-03-26 Published:2013-03-26

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Abstract:

This paper derived a formula to analyze tomographic velocity in pre-stack depth migration based on angle domain common imaging gathers (ADCIGs) and proposed a pre-stack migration velocity analysis method using sequent optimization which gets the initial velocity through the pre-stack time migration velocity analysis on the basis of common scattering point (CSP) gathers and obtains velocity update through pre-stack depth migration velocity analysis on the basis of ADCIGs. The implement steps can be summarized as follows: (1)mapping pre-stack seismic data to CSP gathers and getting root-mean-square velocity by stack velocity spectrum of CSP gathers; (2)transforming root-mean-square velocity to interval velocity in order to model the initial tomography velocity field; (3)obtaining pre-stack migration velocity field by pre-stack depth migration tomographic velocity inversion based on ADCIGs. Examples of fault model and field dataset proved the correctness and validity of this method.

Key words: seismic prospecting, pre-stack migration, velocity analysis, tomography inversion, sequent optimization, common scattering point gathers, angle domain common imaging gathers

CLC Number: 

  • P631.4
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