断陷湖盆咸化环境沉积与页岩油气关系——以东营凹陷、渤南地区为例  

Study on the relationship between saline environmental deposition and shale oil-gas in faulted basin:A case study of areas of Dongying sag and Bonan subsag

作　　者：朱德燕[1,2] 王勇[2] 银燕[2] 杨万芹[2] 朱德顺[2] 宁方兴[2] 

机构地区：[1]中国地质大学(北京)能源学院,北京100083 [2]中国石化胜利油田分公司勘探开发研究院,山东东营257015

出　　处：《油气地质与采收率》2015年第6期7-13,共7页Petroleum Geology and Recovery Efficiency

基　　金：国家"973"计划"中国东部古近系陆相页岩油富集机理及分布规律"子课题"陆相页岩油富集要素与有利区预测"(2014CB239104);国家科技重大专项"渤海湾盆地精细勘探关键技术"子课题"济阳坳陷油气富集机制与增储领域"(2011ZX05006-003);中国石化科技攻关项目"济阳坳陷页岩岩相及油气赋存机制"(P13019)

摘　　要：为明确咸化环境沉积与页岩油气的关系,综合应用岩心、扫描电镜及地球化学、测井等资料,在恢复湖盆咸化过程的基础上,建立了不同咸化阶段沉积序列,并对不同咸化阶段沉积岩性的生烃能力、储集性、含油性和可动性等进行综合研究。济阳坳陷整体表现出沙四段上亚段比沙三段下亚段古盐度高的特征,但是不同凹陷咸化演化程度略有不同。盐度变化控制了岩性的演化序列,在高盐水阶段主要形成膏岩—芒硝—膏质泥岩—白云岩的岩性组合序列;在咸水阶段主要形成灰岩—泥质灰岩/灰质泥岩的岩性组合特征,灰质与有机质呈纹层出现;在微咸水—半咸水阶段主要形成泥质灰岩/灰质泥岩—灰质泥岩/泥岩的岩性组合特征。咸水阶段形成的纹层状(层状)泥质灰岩/灰质泥岩生烃能力强、储集性好、含油性高、可动性好,最有利于页岩油气富集。Based on the comprehensive application of core,electron microscopy and geochemical and logging data,the salinization process of the lake basin was restored to establish different sedimentary sequence at different salinization stages in order to clarify the relationship between saline environmental deposition and shale oil-gas. The properties of sedimentary rocks in different saline environments were studied such as hydrocarbon-generating ability,reservoir property,oil bearing property,mobility and so on. The results show that the paleosalinity of the upper of the fourth member of Shahejie Formation is higher than that of the lower of the third member of Shahejie Formation in Jiyang depression in the whole,but the salinization evolution is different in different sags. Salinity variation controls evolution sequence of lithology. Gypsum rock,Glauber's salt,gypsum mudstone and dolomite lithology deposited in sequence in hypersaline water phase;limestone,argillaceous limestone/lime mudstone deposited in sequence in salt water phase,forming lime and organic matter laminae;argillaceous limestone/lime mudstone-calcareous mudstone/shale deposited in sequence in brackish water phase. Among them,the laminated shale formed in the salt water phase has strong hydrocarbon-generating ability,superior reservoir quality,high oil content and good fluid mobility,which is considered as the most favorable for the enrichment of oil and gas.

关 键 词：咸化演化阶段 咸化沉积特征 纹层状泥页岩 页岩油气 断陷湖盆 

分 类 号：TE111.3[石油与天然气工程—油气勘探]