济阳坳陷车镇凹陷车66块沙三下段精细沉积相分析  

Fine Analysis of Sedimentary Facies in the Lower Third Member of Shahejie Formation from Block Che 66 in Chezhen Sag,Jiyang Depression

作　　者：彭勇民[1] 黄捍东[1] 罗群[1] 

机构地区：[1]中国石油大学CNPC物探重点实验室

出　　处：《现代地质》2007年第4期705-711,共7页Geoscience

基　　金：国家重点基础研究发展规划"973"项目(2006CB202306)

摘　　要：根据测井、地震、岩心资料,运用地质综合方法确定济阳坳陷车镇凹陷北部陡坡带砂体成因类型,搞清深水沉积边界。通过岩心观察与描述、地质地震剖面对比以及沉积相平面分布的研究,认为:车66井区沙三下段发育湖底扇、滑塌浊积扇,它们夹持于暗色深水泥岩之中,以内扇沉积为特色,在主水道及水道间堆积了中、细砾岩碎屑流与背景相泥岩。纵向上,沙三下段具有下部富砂、上部富泥的特征;平面上,自北而南由湖底扇内扇碎屑流→中扇颗粒流、浊流变化,沉积相变化具有从近源到远源发展的趋势,表明了物源来自于北部的埕子口凸起。On the basis of well-loggings, seismics, cores data, the sandstone-body types of the block Che 66 on the northern steep slope zone of Chezhen Sag in Jiyang Depression, were determined by geologically-synthesized methods, and the depositional boundaries of deep-water were also made clear. With detailed observations and descriptions of cores, combined with geological and seismic profiles, and plane distributions of sedimentary facies studied, it was concluded that the sub-lacustrine fans and slide turbidite fans of the Lower Third Member of Shahejie Formation were developed in the block Che 66, interlayered within deep-water dark mudstones where characteristic sediments were the inner fan of the sub-lacustrine fans, within main-channels and inter-channels, medium- and fine-grained conglomerates of debris flows and mudstones of setting sediments. Longitudinally the upper of the member is mudstone-dominated and lower sandstone-dominated. The inner fan debris flows of lake fans were turned into the middle fan grain flows and turbidity flows of lake fans were from north to south, with sedimentary facies trend from near proximate to distal provenances. This proclaimed that the provenances were from the northern Chenzikou bulge.

关 键 词：湖底扇 颗粒流 滑塌浊积扇 车镇凹陷 

分 类 号：TE122[石油与天然气工程—油气勘探]