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《应用地球物理(英文版)》 2005-02
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Research on the Seismic Wave Field of Karst Cavern Reservoirs near Deep Carbonate Weathered Crusts

Yao Yao1, Sa Liming2, and Wang Shangxu2 1.Geophysics Dept., China University of Geosciences, Wuhan 430074, China. 2.Key laboratory of CNPC for geophysical exploration, Petroleum University, Beijing 100083, China.  
Fracture and cavern hydrocarbon reservoirs in carbonates are an important pool type worldwide. The karst cavern reservoirs are easiest to identify on seismic reflection data. The prediction, exploration, and development of this type of reservoir require theoretical research on seismic wave fields reflected from complex inhomogeneous media. We compute synthetic seismic sections for fluid- filled cavern reservoirs of various heights and widths using random media models and inhomoge- neous media elastic wave equations. Results indicate that even caverns significantly smaller than 1/ 4 wavelength are detectible on conventional band-width seismic sections as diffractions migrated into bead-type events. Diffraction amplitude is a function of cavern height and width. We introduce a width-amplitude factor which can be used to calculate the diffraction amplitude of a cavern with a limited width from the diffraction amplitude computed for an infinitely wide cavern.
【Fund】: This research project is sponsored by Nation’s Natural Science Found of China (No. 40174034 and 40274038) as well as theOpening Found Projects of the CNPC geophysical exploration key laboratory (No. GPKL0207).
【CateGory Index】: P631.4;P618.130.8
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