临清坳陷东部地区石炭—二叠系油气成藏时期研究  

Research on hydrocarbon forming period of Carboniferous-Permian in eastern Linqing depression basin

作　　者：李文涛[1,2] 

机构地区：[1]中国石化股份胜利油田分公司地质科学研究院,山东东营257015 [2]中国石油大学(华东)地球资源与信息学院,山东东营257061

出　　处：《油气地质与采收率》2011年第3期1-4,111,共4页Petroleum Geology and Recovery Efficiency

基　　金：中石化股份公司课题"临清坳陷煤成气成藏条件与勘探方向"(P08049)

摘　　要：临清坳陷历经多次构造运动,形成了一个比较典型的叠合盆地。研究表明,该区上古生界石炭—二叠系煤系烃源岩是一套较优质烃源岩,其生烃演化主要受盆地的发育史控制,主要经历了早—中三叠世、早白垩世、古近纪和新近纪—第四纪共4期生烃过程,每期生烃均起始于叠合盆地拗陷沉积阶段,终止于构造抬升剥蚀阶段,第1期由于烃源岩演化程度低生烃量可以忽略不计。流体包裹体样品系统分析成果揭示,石炭—二叠系烃源岩分别在早白垩世、古近纪和新近纪—第四纪发生了3期以天然气充注为主的油气成藏过程,第1期、第2期充注的油气几乎全被破坏,以第3期即新近纪—第四纪晚期充注的天然气成藏为主。油气成藏时期的确定为该区"近源下洼,晚期为主"勘探思路的确立提供了理论依据。Linqing depression becomes a typical superposition basin after multi-period tectonic movements. Research results suggest that the Carboniferous-Permian in Linqing depression is favorable source rocks, their evolution is controlled by basin' s developing history. There are four periods of hydrocarbon generation which occurred during the middle-late Triassic, the late Cretaceous, the Paleogene and the Neogene-Quaternary. Each hydrocarbon generation begins with the depress stage of the basin and ends at the uplifted stage, and the amount of the first generation period is trivial. Systematic analysis on organic fluid inclusions exhibits that three periods of reservoir forming process (mainly nature gas) have been recognized, which oc- cur during the earlier Cretaceous, the Paleogene and the Neogene-Quaternary. Reservoir formed in the first two charging events has been almost destroyed, and the reservoir formed in the third charging event is almost filled with natural gas. Determination of hydrocarbon generation periods provides theoretical evidences for exploration in this area, which can be summarized as 'adjacent source rock, immigration into the low-lying structural belt, hydrocarbon accumulation in later stage'.

关 键 词：叠合盆地油气成藏期次成藏时期流体包裹体石炭—二叠系临清坳陷 

分 类 号：TE112.31[石油与天然气工程—油气勘探]