【摘要】 将AVO分析和叠后地震反演的思路有机结合的叠前地震弹性阻抗反演,既可以充分地利用叠前地震信息,又可以得到直接反映地下岩层信息的资料,是目前地震研究领域的一个热点。叠前地震弹性阻抗反演充分利用振幅随偏移距变化的信息,以叠前入射角道集为基础,束之以纵、横波、密度等测井资料,联合反演出与地下岩层信息及流体直接相关的多种弹性参数,进而进行储层物性及含油气性综合判定。较之叠后波阻抗反演,其对岩性及流体的分辨能力和可信度有较大提高。介绍了叠前弹性阻抗反演技术的基本原理和方法,并对鄂尔多斯Su-76区块实际资料进行反演分析。结果表明,叠前弹性阻抗反演方法的分辨率较高,钻井资料证实其储层预测精度也较高,为该区砂岩气藏储层预测提供了重要依据,获得了良好的应用效果。更多还原

【Abstract】 The pre-stack seismic elastic impedance inversion which combines AVO analysis with the post-stack inversion effectively can not only make full use of the information of pre-stack seismic but also directly reflects the data of information of rock strata.And currently it is a hotspot of earthquake research.It fully utilizes the information of AVO and is based on pre-stack incidence trace gather,and logging data such as S wave、P wave、density etc.The comprehensive evaluation about the reservoir property and hydrocarbon potential can be made by jointly inverting a variety of elastic parameters related to lithology and hydrocarbon potential.Compared with the post-stack acoustic impedance inversion,it has a great improvement in the resolution of lithology,hydrocarbon and reliability.This paper describes the basic principles and methods of pre-stack elastic impedance inversion and analysis of real data collected in Block Su-76 of Ordos Basin.The results show that the resolution of the pre-stack seismic elastic impedance inversion is well,and the drilling data proves that it has high accuracy in reservoir prediction,which provides an important basis for reservoir prediction and gets good application effects.更多还原