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伊宁凹陷煤系地层对深层地震反射波能量衰减机理分析

Progress in Geophysics(2012)

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Abstract
伊宁凹陷侏罗系以下油气勘探未获进展,其原因是侏罗系煤系地层与砂岩地层交互,煤层厚度大部分处在四分之一的地震波长,不仅层间多次波发育严重,而且目的层反射能量较弱.为此,本文基于薄煤系地层地震层间多次波反射和透射的频率特性,来定量分析煤系地层使深层地震反射能量弱的机理,并基于伊宁凹陷已钻探井及初勘地震剖面构制地质模型,采用双程波动方程照明分析方法,验证薄煤层内层间多次波对下伏地层反射能量的衰减,旨在为靶区资料处理阶段提高深层反射能量提供依据.
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Key words
internal multiple,illumination analysis,energy attenuation,thin coal-layer
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