Accumulation process and model for the Ordovician buried hill reservoir in the western Lunnan area,the Tarim Basin  

作　　者：ZHAO MengJun PAN WenQing HAN JianFa LIU ShaoBo QIN ShengFei ZHANG BaoMin 

机构地区：[1]Central Laboratory of Petroleum Geology Research of RIPED, PetroChina, Beijing 100083, China [2]Institute of Petroleum Exploration and Development of Tarim Oilfield, PetroChina, Korla 841000, China

出　　处：《Chinese Science Bulletin》2007年第A01期224-235,共12页

基　　金："The Fenth Five-Year Plan" of the National Scientific and Technologi-cal Programs of China (Grant No. 2001BA605A-06)

摘　　要：The Ordovician buried hill reservoir in the western Lunnan area, a type of dissolved fracture and cavernous reservoir, is mainly composed of heavy oil. The oil is the mixture sourcing from the Middle-Lower Cambrian and Middle-Lower Ordovician, with three stages of pool forming process: (1) the destruction and parallel migration/accumulation during the late Caledonian to early Hercynian; (2) the oil and gas accumulation during the late Hercynian characterized by adjustment upward along faults and parallel migration/accumulation; (3) the formation of heavy oil during the latest Hercynian. The Ordovician buried hill reservoir is affected by the diffusion of light oil and gas but had no hydrocarbon charging during the late Yanshan period to Himalayan period, but in this period, formed the association of heavy oil and dissolved gas cracked from crude oil with dry coefficient of 0.91-0.96. The study on accumulation process of the Ordovician buried hill reservoir has important implications for the exploration potential of early oil and gas accumulation in the cratonic area of the Tarim Basin.The Ordovician buried hill reservoir in the western Lunnan area, a type of dissolved fracture and cavernous reservoir, is mainly composed of heavy oil. The oil is the mixture sourcing from the Middle-Lower Cambrian and Middle-Lower Ordovician, with three stages of pool forming process： （1） the destruction and parallel migration/accumulation during the late Caledonian to early Hercynian; （2） the oil and gas accumulation during the late Hercynian characterized by adjustment upward along faults and parallel migration/accumulation; （3） the formation of heavy oil during the latest Hercynian. The Ordovician buried hill reservoir is affected by the diffusion of light oil and gas but had no hydrocarbon charging during the late Yanshan period to Himalayan period, but in this period, formed the association of heavy oil and dissolved gas cracked from crude oil with dry coefficient of 0.91-0.96. The study on accumulation process of the Ordovician buried hill reservoir has important implications for the exploration potential of early oil and gas accumulation in the cratonic area of the Tarim Basin.

关 键 词：原油 沥青储备 奥陶纪 充填周期 

分 类 号：P57[天文地球—矿物学]