伊宁凹陷煤系地层对深层地震反射波能量衰减机理分析  

The mechanism of seismic reflection energy attenuation on deep coal bed in Yining depression

作　　者：马灵伟[1,2] 顾汉明[1,2] 王帮助[3] 成景旺[1] 

机构地区：[1]中国地质大学地球物理与空间信息学院,武汉430074 [2]中国地质大学构造与油气资源教育部重点实验室,武汉430074 [3]中国石油化工股份有限公司河南油田分公司勘探事业部,南阳473132

出　　处：《地球物理学进展》2012年第3期1227-1233,共7页Progress in Geophysics

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.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.

关 键 词：薄煤层 层间多次波 能量衰减 照明分析 

分 类 号：P631[天文地球—地质矿产勘探]