Shangxu Wang and Xiang-Yang Li 2006 J. Geophys. Eng. 3 1 doi:10.1088/1742-2132/3/1/001
Shangxu Wang1 and Xiang-Yang Li2
Show affiliationsThis paper presents a layer-stripping procedure to determine interval measurements of fracture parameters in multi-layered fractured media with vertically varying strike directions. The procedure is based on the P-wave travel time difference between two orthogonal seismic survey lines, and this difference is referred to as the P-wave azimuthal moveout response (AMR). The interval AMR of a fracture target for a fixed offset is a function of cos 2(α −
i) with respect to the line azimuth α and the fracture-strike azimuth
i. Consequently two pairs of orthogonal survey lines can be used to determine the local fracture strike
i if the interval AMR of the target is known. In the case of a weakly fractured overburden underlain by a fractured target, layer stripping can be achieved through the alignment of the top-target event by performing NMO correction separately for all survey lines. The interval AMR of the target layer may then be calculated from the residual moveout of the bottom-target event, if any. In the general case, a ray-tracing procedure, similar to that used in AVO analysis, is required to perform effective layer stripping. Full-wave modelling is used to verify and illustrate these procedures.
Issue 1 (March 2006)
Received 2 August 2005, accepted for publication 13 October 2005
Published 2 December 2005
Shangxu Wang and Xiang-Yang Li 2006 J. Geophys. Eng. 3 1
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