High angle prestack depth migration with absorption compensation
Zhou Hui1, Lin He1, Sheng Shan-Bo1, Chen Han-Ming1, and Wang Ying1
1. State Key Laboratory of Petroleum Resource and Prospecting, CNPC Key Laboratory of Geophysical Exploration, China University of Petroleum, Beijing 102249, China.
Abstract The absorption effect of actual subsurface media can weaken wavefi eld energy, decrease the dominating frequency, and further lead to reduced resolution. In migration, some actions can be taken to compensate for the absorption effect and enhance the resolution. In this paper, we derive a one-way wave equation with an attenuation term based on the timespace domain high angle one-way wave equation. A complicated geological model is then designed and synthetic shot gathers are simulated with acoustic wave equations without and with an absorbing term. The derived one-way wave equation is applied to the migration of the synthetic gathers without and with attenuation compensation for the simulated shot gathers. Three migration profi les are obtained. The fi rst and second profi les are from the shot gathers without and with attenuation using the migration method without compensation, the third one is from the shot gathers with attenuation using the migration method with compensation. The first and third profi les are almost the same, and the second profi le is different from the others below the absorptive layers. The amplitudes of the interfaces below the absorptive layers are weak because of their absorption. This method is also applied to fi eld data. It is concluded from the migration examples that the migration method discussed in this paper is feasible.
This work was supported in part by the National Natural Science Foundation of China (No. 40974069, 41174119), the Research of Novel Method and Technology of Geophysical Prospecting, CNPC (No. 2011A-3602), and the National Major Science and Technology Program (No. 2011ZX05010, 2011ZX05024).
Cite this article:
ZHOU Hui,LIN He,SHENG Shan-Bo et al. High angle prestack depth migration with absorption compensation[J]. APPLIED GEOPHYSICS, 2012, 9(3): 293-300.
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2012, Vol. 9 
