| 深层碳酸盐岩岩溶风化壳溶洞型油气藏地震波场的理论研究 |
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| 引用本文： | 姚姚,撒利明,王尚旭.深层碳酸盐岩岩溶风化壳溶洞型油气藏地震波场的理论研究[J].应用地球物理,2005,2(2):94-102. |
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| 作者姓名： | 姚姚 撒利明 王尚旭 |
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| 作者单位： | [1]中国地质大学地球物理系,武汉430074 [2]NPC物探重点实验室（石油大学）,北京100083 |
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| 基金项目： | This research project is sponsored by Nation＇s Natural Science Found of China （No. 40174034 and 40274038） as well as the 0pening Found Projects of the CNPC geophysical exploration key laboratory （No. GPKL0207）. |
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| 摘 要： | 碳酸盐岩洞缝型油气藏是我国乃至世界的重要油气藏类型之一，属典型的复杂非均匀介质。其中，岩溶洞穴型油气藏是最容易发现的。为了解决这类储层的勘探开发及预测问题，需要从理论上对它们的地震波场进行研究。我们利用随机介质模型和非均匀介质弹性波动方程计算了不同高度和宽度的充满流体藏层的合成地震剖面。结果表明当绕射波偏移为珠子状的同相轴时即使远小于四分之一波长的溶洞在常规带宽的地震剖面上也是可分辨的，绕射波是溶洞高度和宽度的函数。我们引入一个宽度-振幅因子。可以用这个宽度-振幅因子从对无限宽溶洞计算的绕射波计算有限宽度的溶洞的绕射振幅。
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| 关 键 词： | 碳酸盐岩洞缝型油气藏 地震波场 地震勘验 绕射波 绕射振幅 |
| 收稿时间： | 2004-11-11 |
| 修稿时间： | 2004-11-112005-03-24 |
Research on the seismic wave field of karst cavern reservoirs near deep carbonate weathered crusts |
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| Yao Yao,Sa Liming,Wang Shangxu.Research on the seismic wave field of karst cavern reservoirs near deep carbonate weathered crusts[J].Applied Geophysics,2005,2(2):94-102. |
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| Authors: | Yao Yao Sa Liming Wang Shangxu |
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| Institution: | (1) Geophysics Dept., China University of Geosciences, 430074 Wuhan, China;(2) Key laboratory of CNPC for geophysical exploration, Petroleum University, 100083 Beijing, China |
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| Abstract: | 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 fluidfilled cavern reservoirs of various heights and widths using random media models and inhomogeneous 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. |
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| Keywords: | karst cavern reservoir forward modeling random media model seismic wave field and elastic wave equation |
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