煤层发育条件下薄储层预测方法研究  

Research on thin reservoir prediction method in the coal seam distribution area

作　　者：杨雪[1] 裴家学[1] 何绍勇[1] 蒋学峰[1] 谢天寿 高建军[1] YANG Xue;PEI Jia-Xue;HE Shao-Yong;JIANG Xue-Feng;XIE Tian-Shou;GAO Jian-Jun(Exploration and Development Research Institute of Liaohe Oil Field CNPC,Panjin 124010,China;Exploration and Development Research Institute of Xinjiang Oil Field CNPC,Keramay 834000,China)

机构地区：[1]中石油辽河油田勘探开发研究院,辽宁盘锦124010 [2]中石油新疆油田勘探开发研究院,新疆克拉玛依834000

出　　处：《物探与化探》2020年第2期406-411,共6页Geophysical and Geochemical Exploration

基　　金：中国石油天然气股份公司重大科技攻关项目(2017XPT-Y-B-0009)。

摘　　要：玛湖凹陷在侏罗纪时期整体处于浅水沉积环境,湖盆宽缓、基底振荡,在凹陷西侧斜坡区沉积多套砂泥岩薄互层,易于形成岩性油气藏;该时期还沉积多套煤层,煤层的发育对下部地层的地震响应产生屏蔽作用,造成砂泥层的波阻抗无明显差异,无法进行常规的储层反演预测。通过测井曲线对岩性变化敏感性分析,采用密度和中子曲线共同构建拟声波曲线,使得该曲线削弱煤层影响,能够清晰地反映地层岩性的差异;并以此为约束条件进行拟声波地震反演,解决了该区薄储层预测的难题,取得较好的应用效果。There are multiple combinations of sandstone and mudstone interbeds and also plenty of coal seams in the middle-shallow strata of Mahu sag’s slope zone, due to the slow slope background and shallow lake environment of water oscillation since Jurassic. In addition, the lithologic reservoir can be found in the zone, but the shielding effect of coal seam makes it impossible to predict the reservoir, due to the unclear response of the thin interbed from seismic and acoustic logs. Therefore, the wave impedance inversion cannot distinguish sandstone from mudstone clearly. In view of such a situation, the technique of Pseudo-acoustic curve reconstruction was used in this study. By analyzing multiple well logs, the density and neutron curves, which can weaken the influence of coal seam and reflect the characteristics of sandstone and mudstone interbeds, were selected to rebuild pseudo-acoustic curves and then perform inversion with the rebuilt curves, thus improving greatly the accuracy of reservoir prediction.

关 键 词：玛西斜坡区 煤层 薄储层 拟声波反演 储层预测 

分 类 号：P631[天文地球—地质矿产勘探]