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用P-SV波AVO特性判别油气异常
Hydrocarbon anomaly discovery using AVO characteristics of P-SV wave
【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。
【Abstract】 AVO phenomenon of seismic reflection waves can be seen in both P wave andP-SV wave. Under some conditions,P-SV wave may show more obvious AVO phe-nomenon 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 re-lated petrophysical parameters. Having converted seismic data from x-t domain to θx domain by ray tracing method,we can see very obvious amplitude-variation differ-ence between gas-bearing and gas free parts of the same horizon. Besides,the sec-tion 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.
【Key words】 P-SV wave; AVO; seismic wave; ray tracing; amplitude; Zoeppritz equation; envelope-difference section;
- 【文献出处】 石油地球物理勘探 ,Oil Geophysical Prospecting , 编辑部邮箱 ,1995年05期
- 【分类号】P631.4
- 【被引频次】15
- 【下载频次】116