松辽盆地龙西地区泉四段油气成藏主控因素及模式  

Main factors controlling hydrocarbon accumulation mode of Quan4 Formation in Longxi area,Songliao Basin

作　　者：连承波[1] 钟建华[2] 渠芳[1] 王志坤[3] 杨军[4] 

机构地区：[1]西南石油大学资源与环境学院,四川成都610500 [2]中国石油大学地球资源与信息学院,山东东营257061 [3]中国石油冀东油田公司勘探开发研究院,河北唐山063004 [4]中石油大庆油田勘探开发研究院,黑龙江大庆163712

出　　处：《中国地质》2011年第1期161-169,共9页Geology in China

基　　金：四川省应用基础研究项目(2009JY0418);四川省教育厅青年基金项目(09ZB098)资助

摘　　要：通过对松辽盆地龙西地区泉四段油气成藏主控因素分析,认为青一段烃源岩生成的油气,主要通过两种方式运移到泉四段储层:一种是在青一段泥岩由压实和生烃作用形成超压作用及伴随着构造活动泉四段断层产生扩容空间的负压空吸作用下,形成较大的源储压差,生成的油气沿着高角度断层向下运移到泉四段储层;另一种是在青一段烃源岩沿上倾方向直接和泉四段储层侧向对接的条件下,青一段生成的油气通过侧向运移到泉四段储层。敖古拉—哈拉海断裂带活动导致的差异升降,断裂带以西地区形成明显的向斜区域,油气难以在此运移聚集成藏,而在断裂带以东为斜坡带,有利于油气的侧向运移,断裂西侧的下降导致青山口组的泥岩和泉四段砂岩对接,形成侧向封堵,这种条件下有利于在敖古拉—哈拉海断裂带以东形成大面积的断层岩性油藏。Based on a study of main factors controlling hydrocarbon pooling of Quan4 Formation in Longxi area of Songliao basin,the authors hold that oil and gas generated from hydrocarbon source rock of Qing1 formation mainly migrate into Quan4 Formation in two ways.One is the downward migration of oil and gas generated from hydrocarbon source rock of Qing1 Formation along the faults into Quan4 Formation under the large below-source pressure difference.The large below-source pressure difference results from abnormal pressure of Qing1 Formation formed by compaction and hydrocarbon generation and negative pressure of Quan4 Formation generated along with fault activity.The other one is the lateral migration of oil and gas generated from hydrocarbon source rock of Qing1 Formation into Quan4 Formation under the conditions of upward-inclining lateral connection of hydrocarbon source rock of Qing1 Formation to Quan4 Formation caused by fault activity.The activity of Aogula-HaJahai faulted zone has formed the regional syncline to its west,which is not conducive to migration and accumulation of oil and gas.The eastern area of Aogula-HaJahai faulted zone is a slope,which is favorable for lateral migration of oil and gas.The activity of Aogula-HaJahai faulted zone caused the lateral connection of the mudstone of Qingshankou Formation to the sandstone of Quan4 Formation in the upward inclining direction on the western side of Aogula-HaJahai faulted zone,which is conducive to accumulation of oil and gas.A large number of fault-lithologic oil and gas pools were formed in the eastern area of Aogula-HaJahai faulted zone.

关 键 词：主控因素 成藏模式 泉四段 龙西地区 

分 类 号：P618.130.1[天文地球—矿床学]