摘要
塔里木盆地古城地区奥陶系碳酸盐岩近年来展现出良好的勘探潜力。通过对古城地区钻遇奥陶系10余口探井的岩心、岩石薄片观察和阴极发光、包裹体、沥青反射率分析以及地震资料解释,并结合区域研究成果,系统分析了古城地区奥陶系碳酸盐岩的成储、成藏条件。研究表明:①古构造-流体作用是控制下奥陶统鹰山组下段—蓬莱坝组滩相白云岩储层发育及油气聚集成藏的重要因素;②二叠纪后的构造热事件对油气成藏起到关键的调整改造作用,受岩浆热液活动的影响,加里东期—早海西期原生油藏发生大规模裂解,形成原油裂解气藏及残留古油藏;③奥陶系油气藏的形成与演化经历了3个阶段,包括原生油气藏形成,古油藏破坏裂解生气,以及气藏调整、破坏、再形成阶段,并具有多期演化的油气成藏模式。指出古城低凸起西部、北部的生储盖组合条件良好,断裂和岩浆侵入影响较小,是有利油气勘探区。
The Ordovician in Gucheng area of Tarim Basin has shown good exploration potential in recent years.Based on observation of the core and petrographic thin section,analysis of cathodoluminescence,inclusion and bitumen reflectance of more than 10 Ordovician exploration wells,and interpretation of seismic data in Gucheng area,and combined with regional research results,the reservoir forming and hydrocarbon accumulating conditions of Ordovician carbonate rocks in Gucheng area are systematically analyzed.The results show that:(1)Paleostructure-geofluid processes is an important factor controlling the development of granular dolomite reservoir and hydrocarbon accumulation in the lower member of Yingshan Formation and Penglaiba Formation of Lower Ordovician.(2)Tectonic thermal events after Permian played a key role in adjustment and transformation of oil and gas accumulation.Under the influence of magmatic hydrothermal activity,large-scale oil cracking of primary reservoir occurred in Caledonian-Early Hercynian period,forming crude oil-cracked gas reservoirs and residual paleo reservoirs.(3)The formation and evolution of Ordovician oil and gas reservoirs have experienced three stages,including the formation of primary oil and gas reservoirs,the destruction of ancient reservoirs and the generation of oil-cracked gas,and the adjustment,destruction and reformation of gas reservoirs.It is pointed out that the west and the north of Gucheng low uplift are favorable for oil and gas exploration because of good combination conditions of source,reservoir and caprock,and less influence of faults and magmatic intrusion.
作者
曹彦清
张友
沈安江
郑兴平
齐井顺
朱可丹
邵冠铭
朱茂
冯子辉
张君龙
孙海航
CAO Yanqing;ZHANG You;SHEN Anjiang;ZHENG Xingping;QI Jingshun;ZHU Kedan;SHAO Guanming;ZHU Mao;FENG Zihui;ZHANG Junlong;SUN Haihang(Nanjing University;Exploration and Development Research Institute,PetroChina Daqing Oilfield Company,Daqing,Heilongjiang 163712,China;PetroChina Hangzhou Research Institute of Geology,Hangzhou,Zhejiang 310023,China;不详)
出处
《海相油气地质》
CSCD
北大核心
2020年第4期303-311,共9页
Marine Origin Petroleum Geology
基金
国家科技重大专项下属课题“深层古老含油气系统成藏规律与目标评价”(编号:2017ZX05008-005)
“寒武系—中新元古界碳酸盐岩规模储层形成与分布研究”(编号:2016ZX05004-002)
中国石油天然气股份公司重大科技专项“塔东天然气成藏理论及勘探配套技术研究”(编号:2016E-0204)联合资助。
关键词
构造-流体作用
成藏模式
勘探方向
奥陶系
古城地区
塔里木盆地
paleostructure-geofluid processes
hydrocarbon accumulation model
exploration direction
Ordovician
Gu⁃cheng area
Tarim Basin
