歧口凹陷西南缘白云岩储层油气成藏条件分析?  

The Key Controlling Factors and Accumulation Mode of Dolomite Reservoirs in theSouthwestern Margin of Qikou Sag

作　　者：胡瑞波[1] 石倩茹[1] 牟智全[1] 郭燕珩[1] 胡瑨男[1] 廉梅[1] 杜家鹏[1] 

机构地区：[1]中石油大港油田分公司勘探开发技术研究院,天津300280

出　　处：《长江大学学报（自科版）（中旬）》2014年第1期69-71,共3页Journal of Yangtze University(Nature Science Edition)

基　　金：中石油大港油田分公司重大攻关项目(2008E-0600)

摘　　要：歧口凹陷西南缘古近系沙河街组一段下部(Es下1)广泛发育白云岩类油气藏。经过油源对比发现,油气藏原油主要来自Es下1烃源岩,其特点是成熟度较低,且油气近源充注。在此基础上,对Es下1白云岩类油气藏成藏条件进行了分析:油源条件、储层岩性及厚度、以及储层裂缝的发育是油气成藏的主控因素;良好的油源条件是油气富集高产的基础、储层岩性是油气富集高产的根本、储层厚度是油气富集高产的保障、储层内部裂缝的发育是油气富集高产的关键。歧口凹陷共发育2种白云岩类油气藏成藏模式,并具有自生自储、下生上储、叠加连片成藏等特点。EsL 1superimposed dolomite reservoir is developed in EsL 1in the southwestern margin of Qikou Sag,and the crude oil comes mainly from the hydrocarbon source rocks of EsL 1on the basis of the oil source correlation,which has the characteristics of the low maturity,filling is closed to thesource.According to the analysis of accumulation conditions of dolomite reservoir,the oil source conditions,the lithology,thickness and the cracks of the reservoir are the key controlling factors of dolomite reservoirs.Good condition of hydrocarbon source rock is the base of hydrocarbon enrichment, lithology is the base,thickness is the indemnity,and fracture is the key factor.There are two modes of the dolomite reservoirs in Qikou Sag that oil and gas are from themselves,or from the underlying source rocks,and dolomite oil and gas reservoirs are superimposed together as one.

关 键 词：歧口凹陷 白云岩类储层 油源 成藏模式 

分 类 号：TE121.3[石油与天然气工程—油气勘探]