潜江凹陷王场构造区盐间细粒沉积页岩油富集控制因素——以潜3^(4)-10韵律为例  

The controlling factors on shale oil enrichment of inter-salt fine grained sedimentary rocks in Wangchang anticline of Qianjiang depression, Jianghan Basin: A case of Eq^(4)_(3)-10 rhythm of Qianjiang formation

作　　者：鲍云杰[1,2,3] 李志明 曹婷婷[1,2,3] 黎茂稳 钱门辉[1,2,3] 蒋启贵 刘鹏[1,2,3] 徐二社 陶国亮[1,2,3] 刘伟新 吴世强[4] BAO Yunjie;LI Zhiming;CAO Tingting;LI Maowen;QIAN Menhui;JIANG Qigui;LIU Peng;XU Ershe;TAO Guoliang;LIU Weixin;WU Shiqiang(Wuxi Research Institute of Petroleum Geology,SINOPEC Petroleum Exploration and Production Research Institute,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 Jianghan Oilfield Branch Company,Wuhan,Hubei 430223,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]中国石化江汉油田分公司勘探开发研究院,湖北武汉430223

出　　处：《中国矿业大学学报》2021年第6期1119-1133,共15页Journal of China University of Mining & Technology

基　　金：国家科技重大专项(2017ZX05049-001);国家自然科学基金项目(42090022)。

摘　　要：为了揭示潜江凹陷王场构造区盐间细粒沉积页岩油富集控制因素,以页岩油兼探井潜3^(4)-10韵律系统取心段为研究对象,对典型样品开展了常规热解、多温阶热解、全岩矿物X衍射、抽提物生物标志物、水平与垂向渗透率等分析测试,剖析了王场构造区潜3^(4)-10韵律盐间细粒沉积的含油性、不同赋存状态油含量和来源,认为王场构造区3^(4)-10韵律盐间细粒沉积页岩油富集受洼陷区成熟页岩油侧向运移供烃、具优质烃源岩和储集岩为一体的泥质白云岩相以及上、下厚层盐岩优越的封盖性能共同控制.研究结果表明:王场构造区潜3^(4)-10韵律盐间细粒沉积游离烃S_(1)含量在国内外页岩油勘探层系中属最高(平均为12.5 mg/g),油饱和指数OSI(平均为372 mgHC/gTOC)与北美Bakken组中段的油饱和指数OSI相当;盐间细粒沉积的游离油含量显著高于盐内细粒沉积的游离油含量,并且具有异常低的T_(max)值(平均为419℃)、异常高的烃产率指数PI(平均值为0.58)、生物标志物参数显示成熟特征以及水平渗透率显著高于垂向渗透率,王场构造区盐间细粒沉积层段游离烃S_(1)主要源自蚌湖洼陷区同一层系侧向运移的油,运移油贡献率达82.5%.In order to reveal the controlling factors on shale oil enrichment of inter-salt fine grained sedimentary in Wangchang anticline of Qianjiang depression, Jianghan basin, the coring section of Eq^(4)_(3)-10 rhythm of Qianjiang formation from exploratory wells was taken as a research subject. The analysis tests of routine rock-Eval pyrolysis, multistep pyrolysis, whole rock X-ray diffraction, extractive biomarker, horizontal and vertical permeability for typical samples were carried out in this study.The oiliness, the oil content of different occurrence states, and the origin of inter-salt fine grained sedimentary of Eq^(4)_(3)-10 rhythm of Qianjiang formation in Wangchang anticline of Qianjiang depression were analyzed. It is considered that the shale oil enrichment of inter-salt fine grained sedimentary rocks of Eq^(4)_(3)-10 rhythm of Qianjiang formation in Wangchang anticline is controlled comprehensively by the contributions of mature migration shale oil from the same section in Benghu sag, the argillaceous dolomite facies with excellent source rock and reservoir conditions, and effective sealing of upper and lower thick salt beds of inter-salt fine grained sedimentary rocks of Eq^(4)_(3)-10 rhythm of Qianjiang formation. The results show that the free oil of S_(1) is maximum(average 12.5 mg/g) among the shale oil exploration layer systems at home and abroad, and the index of OSI(average 372 mgHC/gTOC) is equivalent to the value of the middle section of Bakken formation in North American. The free oil contents of inter-salt fine grained sedimentary rocks are obviously higher than that of intra-salt fine grained sedimentary rocks of Eq^(4)_(3)-10 rhythm of Qianjiang formation in Wangchang anticline, showing abnormally low T_(max)(average 419 ℃), high PI(average 0.58), mature characteristics of biomarker parameters, and a horizontal permeability which is obviously higher than the vertical permeability. These results suggest the free oil in inter-salt fine grained sedimentary rocks of Eq^(4)_(3)-10 rhythm of Qi

关 键 词：页岩油富集 控制因素 细粒沉积 盐间 潜3^(4)-10韵律 王场构造区 潜江凹陷 

分 类 号：TE122[石油与天然气工程—油气勘探]