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The Study of Plane-wave Migration Method in Complex Conditions

Author: YangJingLei
Tutor: LiZhenChun
School: China University of Petroleum
Course: Earth Exploration and Information Technology
Keywords: Complex conditions The wave equation pre-stack depth migration Plane wave offset Smooth operator Imaging conditions
CLC: P631.4
Type: Master's thesis
Year: 2008
Downloads: 81
Quote: 0
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Abstract


As the most common shot gathers physical wave equation pre-stack depth migration , involving huge wave extrapolation calculation amount calculation is extremely time-consuming , and less efficient . This deficiency is even more pronounced when the complex surface observations collected . Global directional plane wave , the relative -by- shot migration , plane wave migration imaging results are comparable to their high computational efficiency . Synthesis of plane waves are implicit assumptions about the level of the surface , so in the case of complicated surface , it can not be synthesized in accordance with the conventional manner . Already mature complex surface wave equation pre-stack depth imaging method principle , offset plane wave expansion of the complex surface conditions , been offset by artillery comparable to results at the same time , the same high computational efficiency . The first part of this article first introduces the wave equation pre-stack depth migration method under complex topographical conditions , the second section details the offset plane wave method principle , development status and spreadsheet results , the third part of the complex under the conditions of a plane wave offset the realization of the two methods , and were the model spreadsheet , the fourth part of the seismic prestack depth domain imaging conditions are discussed , making smooth quotient imaging conditions applied to prestack depth imaging . The research results show that using complex surface wave equation prestack depth imaging the same principle of the method , plane wave can be offset extended to complex conditions , the same good effect and high computational efficiency ; through one-step realization of complex surface on the computational efficiency of the direct synthesis plane wave migration method is superior to offset plane wave based on the wave equation datum correction achieved by the two-step method , and apply more convenient ; the results quotient imaging conditions by smoothing significantly better than the correlation imaging conditions , the paper also gives the results of comparison of different smoothing operator , provides a theoretical basis for the practical application of this method .

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CLC: > Astronomy,Earth Sciences > Geology > Geology, mineral prospecting and exploration > Geophysical exploration > Seismic exploration
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