刘策;张义杰;李洪辉;曹颖辉;赵一民;杨敏;周波;

• 1:中国石油勘探开发研究院

摘要(Abstract)：

为研究塔里木盆地古城地区储层、确定奥陶世沉积环境并建立层序地层格架,分析古城地区中下奥陶统岩石学、地震与测井特征,并对5口井岩心及井壁取心进行碳、氧同位素实验。结果表明:古城地区鹰山组划分为两个三级层序,SQ1沉积时期发育弱镶边结构的半局限—开阔台地沉积,顶部层序界面SB2为平行不整合面,下部经历早成岩期岩溶作用,是研究区储层规模化发育的主控因素;SQ2沉积时期受到快速海侵,由半局限台地转变为开阔台地沉积,层序界面SB3的暴露规模与强度小于SB2的,对区域性储层发育控制能力较弱;层序SQ1及SQ2的分界在岩石地层单位上大致与鹰山组三段白云岩及鹰山组二段灰岩的分界对应,界面附近表现显著的碳同位素负漂移。在三级层序划分基础上,在SQ1内部识别8~9个四级层序,在SQ2内部识别4~6个四级层序,其中海侵体系域主要表现为对称性良好的加积型叠置样式,高位体系域表现为向上变浅的加积—进积型叠置样式;四级层序界面对储层的控制作用有限,主要发育准同生期岩溶作用,与古地貌较高部位叠合在小范围内并形成孤立透镜状储层。古城地区奥陶系受加里东运动影响较小,不发育隆起显著的风化壳型岩溶。有利沉积相带与三、四级层序界面叠合区是区域性优质储层的主要勘探目标。

关键词(KeyWords)：层序地层学;奥陶系;储层;古城地区;鹰山组;塔里木盆地

Abstract:

Keywords:

基金项目(Foundation):国家科技重大专项(2011ZX05004-001)

作者(Author):刘策;张义杰;李洪辉;曹颖辉;赵一民;杨敏;周波;

Email:

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