摘要
叠前弹性阻抗反演方法,由于充分利用振幅随偏移距变化的信息,与叠后波阻抗反演相比、对岩性及流体的分辨能力和可信度有较大提高,是当前叠前方演的一个重要方向.本文讨论了弹性阻抗反演的基本原理和流程.指出了该方法的应用条件和关键步骤.对J地区东营组浊积砂岩的实例研究表明,大角度弹性阻抗对含气砂岩具有非常理想的分辨能力,利用近角度和远角度弹性阻抗的交会分析,能够可靠地识别含气砂岩的分布范围.研究结果对该区砂岩气藏的勘探具有重要意义.
The post stack inversion can＇t obtain reliable lithologic information and liquid content. With the increasing demand for higher precision and resolution of oil and gas prospecting, pre stack techniques including elastic impedance inversion are among the promising ones for solving the problem. In this paper, the theory of the pre-stack impedance inversion, the application conditions and the key steps are discussed. A field case study targeted at the turbidite sands in the Dongying formation of the J area is provided, showing that the far angle elastic impedance derived is quite sensitive to sand gas. Cross plots between near angle and far angle elastic impedances can discern the gas sands with high resolution and reliability.
出处
《地球物理学进展》
CSCD
北大核心
2009年第2期574-580,共7页
Progress in Geophysics
基金
国家重点基础研究发展计划(2005CB422104)项目资助
关键词
叠前地震反演
AVO
角道集
弹性阻抗
波阻抗
pre-stack seismic inversion, AVO, angle gather, angle partial stack,elastic impedance
