渤海湾盆地歧口凹陷歧北次凹沙三上亚段页岩岩相特征及含油性差异  

Shale lithofacies characteristics and shale oil bearing differences in the Es_(3)^(s)of Qibei Subsag,Qikou Sag,Bohai Bay Basin

作　　者：蒲秀刚[1] 马超[2] 郭彬程[2] 周可佳[1] 卞从胜[2] 马建英[1] 周素彦[1] 曾旭[2] 张辉[3] PU Xiugang;MA Chao;GUO Bincheng;ZHOU Kejia;BIAN Congsheng;MA Jianying;ZHOU Suyan;ZENG Xu;ZHANG Hui(Research Instituteof Petroleum Exploration and Development,PetroChina Dagang Oilfield Company,Tianjin 300280,China;Research Institute of Petroleum Exploration and Development,Petro China,Beijing 100083,China;Oil Recovery Plant No.6,PetroChina Dagang Oilfield Company,Cangzhou,Hebei 061100,China)

机构地区：[1]中国石油大港油田公司勘探开发研究院,天津300280 [2]中国石油勘探开发研究院,北京100083 [3]中国石油大港油田公司第六采油厂,河北沧州061100

出　　处：《东北石油大学学报》2023年第2期55-69,I0004,I0005,共17页Journal of Northeast Petroleum University

基　　金：国家科技重大专项(2016ZX05046-002);中国石油天然气股份有限公司科技重大专项(2019E-26)。

摘　　要：页岩岩相精细识别与类型划分是陆相页岩油资源潜力评价的重要基础。采用总有机碳质量分数测试、热解、矿物组成、显微岩石薄片、荧光薄片及高频二维核磁共振(2D-NMR)等方法,识别渤海湾盆地歧口凹陷歧北次凹沙河街组三段上亚段(沙三上亚段)主要岩相类型及特征,分析不同岩相含油性差异。结果表明:歧口凹陷歧北次凹沙三上亚段页岩富含石英、黏土和碳酸盐矿物,w(TOC)平均为1.08%,发育纹层状、薄层状和块状3类层理沉积构造,沙三上亚段细粒岩划分为纹层状页岩相、层状页岩相、块状页岩相、钙质页岩相和粉砂岩相5类岩相,不同岩相储层内部含油性不同,长英质矿物质量分数及沉积构造类型对页岩油含量具有明显的控制作用。纹层状和层状页岩相内部发育大规模由有机质、矿物纹层和薄层控制的孔—缝网结构,为页岩油提供大量的有效储集空间,具有高可动油含量特征;块状和钙质页岩相生烃潜力较差且储层结构相对致密,储集性能较差,具有低可动油含量特征。该结果为渤海湾盆地歧口凹陷歧北次凹沙三段页岩油勘探选区评价提供参考。The fine identification and classification of shale facies are the important basis for the evaluation of continental shale oil resource potential.The main lithofacies types and characteristics of the Es_(3)^(s)were identified and the differences in oil-bearing properties of different lithofacies were discussed by using the test and analysis data of total organic carbon(TOC),pyrolysis,mineral composition,micro rock slices,fluorescence slices and high-frequency two-dimensional nuclear magnetic resonance(2D-NMR).The results show that the shale of the Es_(3)^(s)is rich in quartz,clay and carbonate minerals,with an average w(TOC)of 1.08%.Three types of bedding type sedimentary structures are developed,including lamellar,thin-layer and massive ones.The fine-grained rocks in the Es_(3)^(s)can be divided into five lithofacies:laminated shale,bedded shale,massive shale,calcareous shale and siltstone.The oil content in different lithofacies reservoirs is different.The content of felsic minerals and the type of sedimentary structure have obvious control over the shale oil content.Laminated shale and bedded shale develop a large-scale pore-fracture network structure controlled by organic matter,mineral laminae and thin layer,which provides a large amount of effective reservoir space for shale oil and is characterized by high movable oil content.Massive shale and calcareous shale have poor hydrocarbon generation potential and relatively tight reservoir structure,resulting in poor reservoir performance and low movable oil content.The research results are expected to provide a reference for the evaluation of shale oil exploration and selection in the Es_(3)^(s)in Qibei Subsag,Qikou Sag,Bohai Bay Basin.

关 键 词：页岩油 页岩岩相 含油性 沙三上亚段 歧北次凹 歧口凹陷 渤海湾盆地 

分 类 号：TE122[石油与天然气工程—油气勘探]