| 裂缝介质旋转交错网格正演模拟 |
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| 引用本文： | 吴国忱,秦海旭.裂缝介质旋转交错网格正演模拟[J].地震学报,2014,36(6):1075-1088. |
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| 作者姓名： | 吴国忱 秦海旭 |
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| 作者单位： | 中国山东青岛266580中国石油大学(华东)地球科学与技术学院 |
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| 基金项目： | 国家973项目，山东省自然科学基金(ZR2010DM016)共同资助． |
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| 摘 要： | 油气勘探实践表明， 裂缝是油气的储存空间或运移通道， 裂缝介质地震波场的研究越来越受到关注. 实际地层中裂缝形成受多种因素控制， 物理属性比较复杂， 表现出强烈的各向异性. 由于上覆地层的压力使得水平或低陡倾角裂缝存在较少, 大多数为高陡倾角裂缝， 利用线性滑动裂缝介质的等效理论将高陡倾角裂缝介质等效为横向各向同性介质， 便于实际应用. 本文采用各向异性弹性波旋转交错网格模拟方法对含裂缝介质单炮记录进行模拟与分析. 结果表明: 裂缝的存在相当于人为增加反射界面； 裂缝密度越大， 裂缝纵横比越小， 裂缝充填物与背景介质弹性性质差别越大， 引起的反射波能量变化越大. 本文模拟结果为利用地震数据进行裂缝介质参数反演与储层识别及油气预测提供了依据.
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| 关 键 词： | 裂缝介质 旋转交错网格 裂缝密度 各向异性 线性滑动理论 |
| 收稿时间： | 2014-01-06 |
Rotated staggering grid forward modeling in fractured medium |
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| Wu Guochen,Qin Haixu.Rotated staggering grid forward modeling in fractured medium[J].Acta Seismologica Sinica,2014,36(6):1075-1088. |
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| Authors: | Wu Guochen Qin Haixu |
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| Institution: | School of Geosciences, China University of Petroleum, Shandong Qingdao 266580, China |
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| Abstract: | The practice of oil exploration proves that the fractures are the storage space of oil and gas and channels of them to move, thereby the wave-field of cracked media draws more and more attention. The actual fractured reservoir is influenced by many factors and its physical properties are complex, showing strong anisotropy. There only exist high dip-angle cracks because the pressure in the overlying strata makes only a few of horizontal or low dip angle cracks exist. It will be convenient for the practical application if fracture reservoir is equivalent to HTI medium by linear slip theory. This paper simulated and analyzed two-component records based on the anisotropic elastic wave rotated staggered grid modeling. The result shows that the existence of the crack is equivalent to increase the reflection interface artificially. The larger the crack density is, the smaller the aspect ratio is, the greater the difference between background and fracture fillings is, and the larger the change caused by reflection wave energy is. The result provides a basis for the reservoir identification and prediction when using the seismic data. |
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| Keywords: | fracture medium rotated staggering grid fracture density anisot-ropy linear slip theory |
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