摘要
运用层序地层学理论,综合岩心、薄片等资料,对塔中地区奥陶系碳酸盐岩储层发育的主控因素进行了探讨。在研究区内沉积环境和层序界面是影响储层发育最关键的因素。奥陶系储层主要发育在开阔碳酸盐台地、台缘边缘等相区,具有铸模孔、粒间溶孔、晶间溶孔等多种类型,易于后期成岩作用改造并形成优质储层。塔里木奥陶系经历了多期次构造运动,形成了不同时限的剥蚀间断界面,发育了同生期溶蚀—古风化壳表生期岩溶等,有利于优质储层的形成。因此沉积环境与层序界面对储层发育的影响既相互独立又相互影响,缺一不可。
Integrated with some data from core analysis and thin-section identification, the main factors affecting the development of Ordovician carbonate reservoirs in central Tarim Basin were investigated by mean of sequence stratigraphy. Results show that(1)in the study area, two critical factors to influence on reservoir development are depositional environment and sequence boundary;(2)these Ordovician reservoirs are primarily developed at carbonate open platform facies and platform marginal edge facies;(3)the reservoir space includes mould pore, and intergranular and intercrystalline dissolution pore, which are conducive to diagenesis and forming some high-quality reservoirs in the late stage;(4)due to the Ordovician experiencing multiphase tectonism, some discontinuous erosion interfaces with different timing formed, and syngenetic dolomitization and supergene karst at palaeo-weathering crust were well developed, which are favorable to forming high-quality reservoirs. In general, the effect of depositional environment and sequence boundary on reservoir development is either independent or interactive each other.
出处
《天然气勘探与开发》
2015年第4期1-4,7,共4页
Natural Gas Exploration and Development
基金
中国石化西北分公司勘探开发研究院协助项目(KY-S-2008-086)"塔里木盆地下古生界多类型储集体形成与成藏条件研究--塔里木盆地中央隆起带O-Z储集体形成机理
主控因素
有利储集体展布及成藏条件研究"部分成果联合资助
关键词
塔中地区
储层发育
沉积环境
层序界面
central Tarim Basin,reservoir development,depositional environment,sequence boundary
