| 各向异性上覆层对裂缝储层地震AVAz影响的模拟及分析 |
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| 引用本文： | 陆能,刘财,郭智奇,刘喜武.各向异性上覆层对裂缝储层地震AVAz影响的模拟及分析[J].世界地质,2017,36(1):283-292. |
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| 作者姓名： | 陆能 刘财 郭智奇 刘喜武 |
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| 作者单位： | 1. 吉林大学 地球探测科学与技术学院, 长春 130026;
2. 中国石化石油勘探开发研究院, 北京 100083;
3. 中国石化页岩油气勘探开发重点实验室, 北京 100083;
4. 页岩油气富集机理与有效开发国家重点实验室, 北京 100083 |
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| 摘 要： | 为认识和研究上覆层为VTI时,垂直裂缝发育储层的地震反射AVAz响应特性,提出了相适应的正演模拟方法。该方法类比Shoenberg传播矩阵法中水平慢度分量的表达形式,引入了用入射角、方位角和VTI介质中相速度来表达的水平慢度分量作为输入,简化了各向异性反射率法的框架。利用该方法模拟和分析了各向异性层状模型的地震反射响应随方位的变化,讨论了入射角、上覆层各向异性程度对目标层顶底界面反射波AVAz特征的影响。结果表明,采用适当大的观测入射角进行AVAz分析更为合理,上覆层为VTI时会减弱目标层的AVAz特征。测井尺度理论模型的数值模拟说明了该方法的实用性。
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| 关 键 词： | 上覆层 各向异性 AVAz 反射率法 反射系数 |
| 收稿时间： | 2016-03-31 |
| 修稿时间： | 2016-06-29 |
Modeling and analysis of anisotropic overburden effects on seismic AVAz from fractured reservoir |
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| LU Neng,LIU Cai,GUO Zhi-qi,LIU Xi-wu.Modeling and analysis of anisotropic overburden effects on seismic AVAz from fractured reservoir[J].World Geology,2017,36(1):283-292. |
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| Authors: | LU Neng LIU Cai GUO Zhi-qi LIU Xi-wu |
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| Institution: | 1. Geo-exploration Science and Technology Institute, Jilin University, Changchun 130026, China;
2. SinoPEC Petroleum Exploration and Production Research Institute, Beijing 100083, China;
3. SinoPEC Key Laboratory of Shale Oil/Gas Exploration and Production Technology, Beijing 100083, China;
4. State Key Laboratory of Corporation of Shale Oil/Gas Enrichment Mechanism and Effective Development, Beijing 100083, China |
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| Abstract: | In order to understand the AVAz responses from reservoirs with parallel vertical fractures,which underlying VTI strata, we propose a revevant forward modelling method. The method was in analogy with the formula of horizontal slowness components in Schoenberg's method, using the slowness components in terms of incident angle, azimuth and phase velocity in VTI medium as input, and simplified the scheme of anisotropic reflectivity method. We model seismic AVAz responses from the reservoir by this method, and analyze the variation of seismic responses with incident angle and the degree of anisotropy in the overburden. The results show that it is more accurate to undertake AVAz analysis in a reasonable big incident, and the overlying VTI strata weakens the reservoir's seismic AVAz responses. Numerical simulation in log scale proves the practicability of this method. |
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| Keywords: | overburden anisotropic AVAz reflectivity method reflection coefficient |
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