摘要
研究区构造上属中央隆起的巴楚断隆东北部和北部坳陷的阿瓦提凹陷南部。文章详细剖析了烃源岩的时代和类型,提出寒武-奥陶系的暗色泥岩、碳酸盐岩和石炭系的暗色泥岩、碳酸盐岩是区内的两套主要烃源岩。在论述了储集条件(7大套好或中等储层)、保存条件(10套Ⅰ类和Ⅱ类盖层)、生储盖组合形成(5套储盖组合)和吐木休克断裂活动(两期重大的冲断活动)的基础上,认为该区的油气藏形成时期主要受控于储盖组合形成期、圈闭形成期和排烃期,因而本区的主要成藏期是二叠纪末和新近纪。据此对研究区的油气远景进行了评价,提出和田河下游断鼻构造带和巴东4井区背冲构造是近期的勘探靶区。
There were two main structural units in the studied area ： northern part of the Bachu Fault-Uplift（ sub-order unit of the Central Rise） and southern part of the Awat Sag（ sub-order unit of the North Depression） , separated each other by the Tumxuk fracture. The ages and types of the source rocks were analysed detailly, which showed the dark argillites and carbonate rocks in ages of Cambrian-Ordovician and Carboniferous being two main source layers. The conditions of reservoiring and preservation were discussed, which revealed there occurring seven reservoir beds with good or medium quality, and ten Ⅰ - or Ⅱ -type covers. There existed five source-reservoir-cap rock associations, namely, the Sinian-lower Cambrian, upper Cambrian- Ordovician, middle-lower Carboniferous, upper Carboniferous-Permian and Triassic-Neogene. The accumulation ages might be mainly controlled by ages of reservoir-cap formation, trap creation and hydrocarbon-discharge. The Tumxuk fault was an important boundary fracture during geohistory, with two extensively thrustings in the latest Permian and in Neogene respectively. Correspondingly, the most important and benificial accumulation periods were the latest Permian and Neogene, and for the latter, the secondary generation accumulation in later stage should be emphasized. Based on what mentioned above, the oil-gas potentials of the studied area were estimated, and the structures in the lower reach of the Hetian River and Well Badong No. 4 region might be exploration targets in near future.
出处
《地质科学》
CAS
CSCD
北大核心
2008年第3期473-487,共15页
Chinese Journal of Geology(Scientia Geologica Sinica)
关键词
烃源岩
储集层
保存条件
生储盖组合
油气远景
塔里木盆地西部
Source rocks, Reservoirs, Preservation conditions, Source-reservoir-caprock associations, Oil-gas potentials, The western Tarim Basin
