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The Study of Wave Equation Finite Differential Datum Correction Method for Irregular Topography

Author: LiuTianTian
Tutor: SongJianGuo
School: China University of Petroleum
Course: Earth Exploration and Information Technology
Keywords: Undulating surface Finite difference Triangular grid Rectangular grid Datum correction Inverse delay Billiton
CLC: P631.4
Type: Master's thesis
Year: 2011
Downloads: 40
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Abstract


With the changes in the area of the development and exploration of oil and gas exploration technology , undulating surface has become a worldwide problem . Undulating surface problem is mainly reflected in: surface elevation dramatic changes , leading to a serious problem of static correction ; big changes in near-surface velocity , high-speed layer outcrops complex surface lithology result in serious interference wave , even severe deformation of the subsurface reflection wave morphology and so on. Typically, the surface to solve the problem is through the static correction , static correction is often based on surface consistent assumption , thus the problem of complex surface NA . This paper the wave equation inverse delay the extension datum correction method has important significance to the elimination of the undulating surface , low velocity impact . The papers were used rectangular grid and irregular triangular mesh finite difference method for solving the wave equation , combining with the perfectly matched layer (PML) absorbing boundary conditions , to achieve a numerical simulation of the undulating terrain model seismic wave propagation . The finite difference method on a regular grid ragged surface description ability , rather than rules triangular mesh finite difference method has the advantage of simple, computationally efficient , able to accurately describe the ups and downs of the speed interface morphology . This method is limited to regular grid algorithm is compatible , so that the method can be considered as effective improvement of the traditional rules of the finite-difference algorithm . Wave equation datum correction method provides the basis for the implementation of this method oriented papers . In this thesis, using the wave equation inverse delay Billiton datum correction , the method of thinking stems from the reverse-time migration technique has the advantage of amplitude and phase accurate , able to adapt to the lateral velocity . The inverse delay Billiton datum correction results of the theoretical model and the actual data show that the effectiveness of the method , this method can eliminate the problems the complex surface caused by the earthquake wave deformation energy inequality and better maintained seismic wave propagation dynamics characteristics , so as to provide a good foundation for data migration imaging .

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