【摘要】 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.更多还原

【Abstract】 The reason why the exploration of oil and gas under Jurassic of Yining Depression does not make much progress is due to the interaction of Jurassic coal-layers and sandstone strata.As the thickness of most of the coal-layer is about one fourth of the wavelength,the internal multiple is obvious,and the reflection energy of the target layer is too weak.The principle of how the coal layer weaken the energy of deep seismic reflection is analyzed,based on the frequency properties of internal multiple reflections and transmitted waves of thin coal seams.Based on drilling wells in Yining Depression and the seismic profile,the geological model of this area has been built.By the method known as two-way wave-equation illumination analysis,inspection and verification of the internal multiple of coal-layer weaken the energy of seismic reflection.The aim of this article is to supply some proof on how to improve the energy of deep reflections in the data processing stage.更多还原