溱潼凹陷阜二段页岩岩相组合特征及其对含油性的影响  

Shale lithofacies combinations and their influence on oil bearing property in the 2nd Member of Funing Formation,Qintong sag

作　　者：李思佳 唐玄[1,2] 昝灵 花彩霞[3] 冯赫青[4] 陈学武 郑逢赞 陈宗铭 LI Sijia;TANG Xuan;ZAN Ling;HUA Caixia;FENG Heqing;CHEN Xuewu;ZHENG Fengzan;CHEN Zongming(School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083,China;Key Laboratory for Strategic Evaluation of Shale Gas Resources,Ministry of Natural Resources,Beijing 100083,China;Exploration and Development Research Institute,SINOPEC East China Branch Company,Nanjing,Jiangsu 210019,China;North China Oilfield Branch of PetroChina,Renqiu,Hebei 062552,China)

机构地区：[1]中国地质大学(北京)能源学院,北京100083 [2]自然资源部页岩气资源战略评价重点实验室,北京100083 [3]中国石化华东油气分石油勘探开发研究院,江苏南京210019 [4]中国石油华北油田公司勘探开发研究院,河北任丘062552

出　　处：《中国海上油气》2024年第2期37-49,共13页China Offshore Oil and Gas

基　　金：国家自然科学基金项目“超临界CO_(2)与陆相干酪根-油-水体系的相互作用机理研究(编号:42372164)”;中国地质大学(北京)研究生创新资助项目“陆相页岩干酪根CO_(2)置换封存机理研究(编号:99964/640223004)”部分研究成果。

摘　　要：苏北盆地溱潼凹陷阜宁组二段(阜二段)页岩油勘探取得了一系列突破。溱潼凹陷阜二段页岩矿物组成占比接近,且岩相单层厚度薄、垂向上变化十分频繁,依靠传统矿物组成的岩相划分方法在本地区应用受到很大局限。以溱页1井湖相泥页岩层段岩心为研究对象,通过岩心、薄片观察、全岩X射线衍射、有机地球化学等实验分析,开展岩相划分及其组合特征研究,并分析其对含油性的影响。研究认为:在页岩矿物组成近似条件下,基于沉积构造,溱潼凹陷阜二段页岩可分为块状黏土质泥岩(MCM)、块状混合质泥岩(MMM)、纹层状混合质页岩(LMS)、层状混合质页岩(BMS)和纹层状长英质页岩(LSS)共5种岩相类型,根据岩相在垂向上分布的规律又划分出8种岩相组合;阜二段页岩岩相组合与层段划分具有一定对应性,以S1=1.5 mg/g、OSI=100 mg/g为主要界限指标,可以将不同岩相组合含油性及可动性进行很好的区分,符合S1>1.5 mg/g、OSI>100 mg/g标准的MCM-LMS-BMS和LMS-BMS-LMS岩相组合确定为该区有利岩相组合,其所属层段为页岩油勘探有利层段。本研究认识为陆相页岩岩相及其对油气聚集控制理论的完善提供了有益补充。A series of breakthroughs have been made in the exploration of shale oil in the 2nd Member of Eocene Funing Formation(E1f2)in Qintong sag,Subei basin.The mineral composition of the shale in E1f2 of Qintong sag has similar proportions,and the single layer thickness of the lithofacies is thin with frequent vertical changes,which greatly limites the application of shale lithofacies classification based on traditional mineral composition.Taking the core of the mud shale layer in the lake facies of Well Qinye 1 as the research object,the lithofacies classification and combination characteristics are studied,and their influence on oil bearing property are analyzed through experimental analysis such as core,thin section observation,whole rock X-ray diffraction,organic geochemistry,etc.The results reveal that,under approximate conditions regarding shale mineral composition,the shale of E1f2 in Qintong sag can be divided into five types of lithofacies based on sedimentary structure,including massive clay mudstone(MCM),massive mixed mudstone(MMM),laminated mixed shale(LMS),bedded mixed shale(BMS),and laminated siliceous shale(LSS),and eight lithofacies combinations according to the vertical distribution pattern of lithofacies;the shale lithofacies combinations of E1f2 has a certain correspondence with interval division,the oil bearing property and mobility of different lithofacies combinations can be well distinguished by using S1=1.5 mg/g and OSI=100 mg/g as the main indexes,the lithofacies combinations MCM-LMS-BMS and LMS-BMS-LMS that meet the criteria of S1>1.5 mg/g and OSI>100 mg/g are identified as favorable lithofacies combinations in this area,and the intervals they belong to are the favorable intervals for shale oil exploration.In summary,this study provides valuable insights to the theory of terrestrial shale lithofacies and its control on hydrocarbon accumulation.

关 键 词：苏北盆地 溱潼凹陷 阜宁组 页岩岩相 岩相组合 页岩油 含油性 可动性 

分 类 号：TE122.2[石油与天然气工程—油气勘探]