摘要
中国西北部侏罗系油气田有56个,分布在7个侏罗系坳陷之中。根据与侏罗系有关的油气藏的烃源岩与储集层匹配的关系,可将油气藏分为自生自储、自生它储和它生自储三种类型。指出自生自储型的油气藏规律,在平面上分布于成熟的有效烃源岩范围内;纵向上分布于区域性优质盖层之下。侏罗系油气以垂向运移为主,运移通道主要是断层。油气在成藏后普遍发生过三次运移,使其在更新的层位中形成次生油气藏。侏罗系油气具有多次成藏期,主要成藏期发生在早白垩世末、早第三纪渐新世,最晚可跨到晚第三纪中新世。利用自生矿物伊利石同位素年代分析方法定量地研究了吐哈盆地12个油田,准噶尔盆地2个油田,民和盆地2个井点的油气成藏期。
Wang Changgui Female Professor of Engineering Petroleum Geology Geochemical Laboratory CNPC Beijing 100101 China . Abstract 56 oil and gas fields are distributed in seven Jurassic depressions in northwestern China. Based on the source rock reservoir assemblage relations in Jurassic hydrocarbon pools the author classified them into three types of pools i.e. self generated and self contained pool self generated and alien contained pool and alien generated and self contained one. And the distribution of self generated and self contained pool is characterized from lots of available data by that horizontally it occurs within mature and effective source rocks vertically it lies beneath regional premium cap rocks. The migration of Jurassic petroleum is dominated by vertical direction with faults or fractures as its principal pathway. The hydrocarbon reservoir which has been formed then underwent three times of migration as a result of forming secondary pools in update horizons. Hence the Jurassic hydrocarbons is characterized by multistage of reservoirs and main stages are found from the end of Early Jurassic Oligocene to Miocene. Also 12 oilfields in Turpan Hami basin 2 oilfields in Junggar basin and 2 well locations in Minghe basin are quantitatively studied for their reservoir stages using illite isotopic dating method.
出处
《新疆石油地质》
CAS
CSCD
2000年第5期357-360,共4页
Xinjiang Petroleum Geology
关键词
侏罗纪
油气藏
分布
生油层
油气运移
储集层
Jurassic Reservoir Formation Reservoir distribution Regular Source bed Reservoir migration Reservoir formed stage