渤海湾盆地东濮凹陷北部页岩油富集类型和烃类组成特征——以文410井古近系沙河街组三段为例  

Enrichment types and hydrocarbon composition characteristics of shale oil in the northern part of Dongpu Sag,Bohai Bay Basin:a case study of the third member of Paleogene Shahejie Formation of well Wen 410

作　　者：冷筠滢 钱门辉[1,2,3] 鹿坤 徐二社[1,2,3] 周勇水[4] 鲍云杰 李志明[1,2,3] 蒋启贵[1,2,3] LENG Junying;QIAN Menhui;LU Kun;XU Ershe;ZHOU Yongshui;BAO Yunjie;LI Zhiming;JIANG Qigui(Wuxi Research Institute of Petroleum Geology,SINOPEC,Wuxi,Jiangsu 214126,China;State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development,Wuxi,Jiangsu 214126,China;SINOPEC Key Laboratory of Petroleum Accumulation Mechanisms,Wuxi,Jiangsu 214126,China;Research Institute of Exploration and Development,SINOPEC Zhongyuan Oilfield Company,Puyang,Henan 457001,China)

机构地区：[1]中国石化石油勘探开发研究院无锡石油地质研究所,江苏无锡214126 [2]页岩油气富集机理与有效开发国家重点实验室,江苏无锡214126 [3]中国石化油气成藏重点实验室,江苏无锡214126 [4]中国石化中原油田分公司勘探开发研究院,河南濮阳457001

出　　处：《石油实验地质》2022年第6期1028-1036,共9页Petroleum Geology & Experiment

基　　金：国家自然科学基金项目(42090022);国家科技重大专项(2017ZX05049001);国家重点基础研究发展计划(973)项目(2014CB239101)联合资助。

摘　　要：为研究渤海湾盆地东濮凹陷北部页岩油的含油性及烃类组成特征,对文410井古近系沙河街组三段岩心样品开展了冷冻热解、三维定量荧光、气相色谱—质谱、岩石薄片等分析测试。东濮凹陷北部沙三段主要发育夹层型和裂缝型2种页岩油富集类型,烃类赋存主要为粒间孔和微裂缝2种形式,有效孔缝组合是页岩油高效富集的关键;岩心样品抽提物烃类组成特征主要以低碳数正构烷烃为主,C_(27)—C_(28)—C_(29)规则甾烷呈“V”型分布,反映出有机质来源主要为陆生高等植物与低等水生生物;伽马蜡烷含量较高,较低的Pr/Ph比值,反映该区有机质沉积环境主要为咸化的还原环境;结合C_(31)22 S/(22 S+22 R)、T_(s)/(Ts+Tm)、C_(29)ααα20 S/(20 S+20 R)、C_(29)ββ/(αα+ββ)等参数,表明烃源岩处于成熟阶段。To reveal the oil-bearing characteristics and hydrocarbon composition of shale oils in the third member of Shahejie Formation in the northern part of Dongpu Sag,Bohai Bay Basin,analysis and testing were carried out by the means of frozen-craching followed by pyrolysis,3D quantitative fluorescence test,GC-MS and thin section observation.Two shale oil enrichment types including interlayer type and fracture type are mainly developed in the third member of Shahejie Formation of well Wen 410.The hydrocarbon mainly occurres in inter-granular pores and micro-fractures,and effective pore-fracture combination is the key to the efficient enrichment of shale oil.The hydrocarbon composition of rock extracts is mainly characterized by n-alkanes with low carbon numbers,and the regular steranes of C_(27)-C_(28)-C_(29)show a V-shaped distribution,reflecting that the sources of organic matter are mainly terrestrial higher plants and lower aquatic organisms.The high content of gammacerane and the low Pr/Ph ratio indicate that the sedimentary environment in this area is mainly a saline reducing environment.C_(31)22 S/(22 S+22 R),Ts/(Ts+Tm),C_(29)ααα20 S/(20 S+20 R),C_(29)ββ/(αα+ββ)and other biomarker parameters indicate that the source rocks are at mature stage.

关 键 词：烃类组成 赋存形式 页岩油 沙河街组 古近系 东濮凹陷 渤海湾盆地 

分 类 号：TE122.116[石油与天然气工程—油气勘探]