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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Amplitude variation with offset responses for gas hydrate/free gas models: a case study
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Amplitude variation with offset responses for gas hydrate/free gas models: a case study

机译:天然气水合物/游离气模型的振幅响应偏移响应

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Gas hydrate is considered as a potential major energy resource for India. The presence of gas hydrate is inferred mainly by identifying an anomalous reflector, known as the bottom simulating reflector (BSR) on seismic sections. Understanding the properties of gas hydrate/free gas-bearing sediments and studying the amplitude-versus-offset (AVO) or amplitude versus incidence angle (AVA) characteristic from a BSR are important. The objective of the present work is to study the behaviour of reflection coefficient with angle of incidence for gas sand/shale and gas hydrate/free gas models. The amplitudes of reflected seismic waves are directly proportional to seismic reflection coefficients at an interface between different geological strata. The variation of AVO or AVA can be used in arriving at petrophysical/lithological models. The study shows variation in the reflection coefficient obtained by elastic impedance method and from Zoep-pritz equations. Different gas hydrate saturations show a positive, negative or no AVO anomalies in BSR.
机译:天然气水合物被认为是印度潜在的主要能源。天然气水合物的存在主要是通过识别异常反射器来推断的,该反射器被称为地震剖面上的底部模拟反射器(BSR)。重要的是要了解天然气水合物/含游离气的沉积物的性质,并研究BSR的振幅与偏移量(AVO)或振幅与入射角(AVA)特征。本工作的目的是研究气砂/页岩和天然气水合物/游离气模型的反射系数随入射角的变化。反射地震波的幅度与不同地质层之间的界面处的地震反射系数成正比。 AVO或AVA的变化可用于得出岩石物理/岩性模型。研究表明,通过弹性阻抗法和Zoep-pritz方程获得的反射系数存在变化。不同的天然气水合物饱和度在BSR中显示出正,负或无AVO异常。

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