摘要
塔里木盆地海相油气勘探潜力巨大,近几年来展现出喜人的勘探局面。叠合盆地碳酸盐岩油气成藏的复杂性和改造作用,给油气成藏研究提出了严峻挑战。目前,在油气的来源、油气藏形成时期和过程方面存在一定争议。为了适应目前的勘探形势,让油气成藏研究成果能够更加有效地指导勘探与生产实践,2009年7月在甘肃省兰州市召开了"中国西部典型叠合盆地复杂油气藏形成改造再聚集机制"学术研讨会,专门针对塔里木盆地油气成藏的研究现状及存在的问题开展了深入讨论,并取得了如下共识:①正确认识油气来源对于资源评价非常重要,塔里木盆地海相油气主要来源于寒武系和奥陶系2套烃源岩,油气"混源"现象突出,中上奥陶统烃源岩贡献比例较大;②油气成藏时期总体与重大构造变革期相对应,晚加里东期是寒武系大量生排烃期,早海西期由于抬升暴露油藏破坏而形成志留系沥青;晚海西期是奥陶系油藏的重要充注成藏期;天然气主要在晚喜马拉雅期注入;③动态研究油气成藏过程,必须恢复重要成藏期的古构造,并考虑历史时期的地质事件可能对油气成藏有着重要影响,应选准几个典型油气藏进行精细解剖,然后从整体上总结油气区域分布规律。
Tarim Basin was a typical superimposed basin with large amount of oil and gas, and lots of hydrocarbon accumulations have been discovered in recent years. As a result of complex hydrocarbon accumulation and transformation of the basin, the studies on its hydrocarbon accumulation are of great challenge. At present, there are some disputes on its oil sources, reservoir forming stages and process. To meet the need of present exploration, the conference was held in Lanzhou, July 2009, with the subject of ＂Complex Oil ＆ Gas Pool Formation, Adjustment and Re-accumulation Mechanism of the Typical Superimposed Basins in the West of China＂. In the conference, the scholars have discussed the present research situations and open questions of hydrocarbon accumulation of the Tarim basin, and finally reached the agreements as the following： （1）Correct understanding of oil and gas source was important for resource assessment, the marine oil and gas are mainly from the Cambrian and Ordovician source rocks in the Tarim basin, and the ＂mixed source oil＂ was obvious, and the Middle-Upper Ordovician source rocks do a greater contribution to the hydrocarbon accumulation. （2）Hydrocarbon accumulation periods are generally related to those significant structural changes. In the Caledonian, the Cambrian source rocks generated and expulsed a large amount of hydrocarbons; in the early Hercynian, the reservoirs were destructed and the Silurian asphaltic sands were formed because of uplifting and exposing; large amount of oil was filled into reservoirs in the late Hercynian and natural gas in the late Himalayan. （3）To study dynamically on hydrocarbon accumulation processes, it is necessary to restore the ancient structures of important pool-forming periods, and consider the effect of geological events. Only based on comprehensive analysis of some typical reservoirs, the distribution of oil-gas could be summarized.
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2009年第5期664-669,共6页
Natural Gas Geoscience
基金
国家"973"项目"中国西部典型叠合盆地油气成藏机制与分布规律"(编号:2006CB202307)资助
关键词
复杂油气藏
海相油气
油源对比
成藏期次
流体包裹体
塔里木盆地
Complex oil ＆ gas pool
Marine oil and gas
Oil-source correlation
Hydrocarbon accumulation stages
Fluid inclusion
Tarim basin.
