| 用P-SV波AVO特性判别油气异常 |
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| 引用本文： | 胡中平. 用P-SV波AVO特性判别油气异常[J]. 石油地球物理勘探, 1995, 30(5): 653-658 |
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| 作者姓名： | 胡中平 |
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| 作者单位： | 地质矿产部石油物探研究所 |
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| 摘 要： | 地震反射波振幅随炮检距变化的规律(AVO)不仅P波存在,而且P-SV波也同样具有AVO特征.在某些条件下,P-SV波的AVO特征更明显、本文先从Zoeppritz方程出发,利用研究区的物性参数,分析了含气砂岩顶、底界的AVO特性.再用射线追踪方法对实际资料进行由x-t域到θ-x域转换以后,同一层位的含气和非含气部位振幅变化差异十分明显.在包络差剖面上可见含气层周围有明显的振幅异常.据此,可在研究区内利用P-SV波的AVO特性判别油气异常.
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| 关 键 词： | P-SV波 AVO 地震波 射线追踪 振幅 Zoeppritz方程 包络差剖面 |
| 收稿时间： | 1994-10-17 |
Hydrocarbon anomaly discovery using AVO characteristics of P-SV wave |
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| Hu Zhongping.. Hydrocarbon anomaly discovery using AVO characteristics of P-SV wave[J]. Oil Geophysical Prospecting, 1995, 30(5): 653-658 |
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| Authors: | Hu Zhongping. |
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| Affiliation: | Research Institute of Oil Geophysical Exploration, Ministry of Geology and Minerals, No.21Weigang, Nanjing City, Jiangsu Province, Postcode:210014 |
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| Abstract: | AVO phenomenon of seismic reflection waves can be seen in both P wave and P-SV wave.Under some conditions,P-SV wave may show more obvious AVO phenomenon than P wave.AVO characteristics of P-SV waves from top and bottom of gas-bearing sandstone has been analysed with the use of Zoeppritz equation and related petrophysical parameters.Having converted seismic data from x-t domain to θ-x domain by ray tracing method,we can see very obvious amplitude-variation difference between gas-bearing and gas free parts of the same horizon.Besides,the section of envelope difference shows obvious amplitude anomaly along the periphery of gas reservoir.We can thus discover hydrocarbon accumulation by analysing the AVO characteristics of P-SV wave in an area. |
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| Keywords: | P-SV wave AVO seismic wave ray tracing amplitude Zoeppritz equation envelope-difference section |
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