摘要
不整合既可以对油气藏的形成起到重要作用,也可以使已形成的油气藏遭到破坏。通过理论及实例分析,阐述了不整合对油气藏的破坏作用。不整合的形成导致油气藏直接或间接暴露于地表,发生各种稠变作用(生物降解、水洗、氧化和逸散等),使油气藏遭到破坏;不整合可延缓甚至中断烃源岩的生烃作用,进而影响油气藏的规模;不整合能否重建形成封闭作用也影响和控制着油气的晚期成藏。
Unconformity not only plays an important role in the formation of oil and gas reservoirs,but destroys the forma-tion of oil and gas reservoirs as well. Through theoretical discussion and case studies,the destructive effects of uncon-formity towards oil and gas reservoirs have been explained in this paper. The formation of unconformity could make oil and gas reservoirs be exposed to the surface,either directly or indirectly,bringing the alteration of heavy oil (biological degradation,washing,oxidation and effusion,etc.) ,so that oil and gas reservoirs could be destroyed. Unconformity can delay or interrupt hydrocarbon generation of hydrocarbon source rocks,thereby affecting the size of oil and gas reser-voirs. Besides that,unconformity can also affect the recon-struction of sealing process of late oil and gas accumulation.
出处
《石油地质与工程》
CAS
2010年第2期25-28,共4页
Petroleum Geology and Engineering
基金
国家科技重大专项"中国陆上地层油气藏形成主控因素与成藏模拟研究"(编号2008ZX05001)
关键词
不整合
油气藏
破坏作用
稠变作用
生烃作用
重建封闭作用
unconformity
oil and gas reservoirs
dama-ging effects
alteration of heavy oil
hydrocarbon
recon-struction of sealing process
