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利用地震反射波振幅随偏移距变化的信息勘探天然气藏,是近年来发展起来的一种新方法。在某些沉积环境下应用该方法能够提供天然气藏存在的重要线索。然而终因这种振幅随偏移距变化的信息,在常规的共中心点叠加中受到压制而不能反映出来。本文着重阐述了该方法的基本原理,分析方法,各种特殊处理和显示方法以及利用该方法进行岩性模拟,求取 P 波阻抗模型、S 波速度模型、Vp/Vs 模型的方法及解释。同时介绍了在资料采集、数据处理及地质解释中所存在的各种影响因素。本文希望,能为从事该方法研究的物探人员提供有参考价值的资料。
The exploration of natural gas reservoirs based on the information of seismic reflection amplitude changes with offset changes is a new method developed in recent years. Applying this method in some sedimentary environments can provide important clues to the existence of natural gas reservoirs. However, the information that finally varies with offset due to this amplitude can not be reflected in the conventional overlay of concentric points. This paper focuses on the basic principles of the method, analysis methods, a variety of special treatment and display methods and the use of the method of lithology simulation, to obtain P wave impedance model, S wave velocity model, Vp / Vs model method and interpretation. At the same time introduced in the data acquisition, data processing and geological interpretation of the existence of various factors. This article hopes to provide valuable information for the geophysical personnel engaged in the research of this method.