湖相页岩油地层岩相组合类型划分及其油气勘探意义——以博兴洼陷沙河街组为例  

Types of shale lithofacies assemblage and its significance for shale oil exploration:A case study of Shahejie Formation in Boxing Sag

作　　者：林中凯[1] 张少龙 李传华 王敏[4] 闫建平[3] 蔡进功[2] 耿斌[4] 胡钦红 LIN Zhongkai;ZHANG Shaolong;LI Chuanhua;WANG Min;YAN Jianping;CAI Jingong;GENG Bin;HU Qinhong(Manage Center of Oil and Gas Exploration,Sinopec Shengli Oilfield,Dongying,Shandong 257001,China;State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,China;School of Geoscience and Technology,Southwest Petroleum University,Chengdu,Sichuan 610500,China;Institute of Exploration and Development,Sinopec Shengli Oilfield Company,Dongying,Shandong 257015,China;Department of Earth and Environmental Sciences,University of Texas at Arlington,Arlington,Texas 76019,USA)

机构地区：[1]中国石化胜利油田分公司油气勘探管理中心,山东东营257001 [2]同济大学海洋地质国家重点实验室,上海200092 [3]西南石油大学地球科学与技术学院,四川成都610500 [4]中国石化胜利油田分公司勘探开发研究院,山东东营257015 [5]德克萨斯大学阿灵顿分校地球与环境科学系,美国76019

出　　处：《油气藏评价与开发》2023年第1期39-51,共13页Petroleum Reservoir Evaluation and Development

基　　金：中国石化胜利油田分公司油气勘探管理中心项目“博兴洼陷页岩油岩相组合及甜点测井评价研究”(30200384-21-ZC0613-0021);国家自然科学基金“陆相页岩油在基质—裂缝体系中的多尺度运移机理研究”(41830431);中国石油—西南石油大学创新联合体科技合作项目“川南深层与昭通中浅层海相页岩气规模效益开发关键技术研究”(2020CX020000);中国石油科技部“十四五”重大专项“川南海相深层页岩气资源潜力及富集规律研究”(2021DJ1901);四川省自然科学基金“页岩气储层低电阻率成因机制及对含气性的影响研究”(2022NSFSC0287)。

摘　　要：为实现陆相富有机质页岩油储层高效开发,以东营凹陷博兴洼陷沙三下—沙四上纯上亚段湖相页岩为研究对象,利用岩石薄片、全岩衍射以及主微量元素等多种地质资料,在厘清岩相类型和沉积古环境演化阶段及二者耦合关系的基础上,划分出8种岩相组合类型,并基于不同组合类型页岩油甜点评价参数对比分析,确定了优势组合类型及其平面分布特征。结果表明:(1)博兴洼陷沙三下—沙四上纯上亚段主要发育富有机质纹层状泥质灰岩和灰质泥岩、富有机质层状泥质灰岩和灰质泥岩以及含有机质块状泥质灰岩和灰质泥岩6种岩相类型;(2)沙四上纯上至沙三下地层,沉积古环境整体上呈现出古气候由干旱到湿润、古氧化还原性变化不大、古盐度由高到低、古物源由少到多的变化特征,显示出8个演化阶段,对应8种岩相组合类型;(3)岩相组合F和D分别为沙三下和沙四上纯上亚段有利岩相组合类型,整体产能高且与当前生产实践吻合性较好;平面上,前者主要分布在F159-F156-F160井区,后者主要FYP1-F116-F119和F156-F159-F161井区,为博兴洼陷页岩油富集高产区域。In order to realize the efficient development of lacustrine organic-rich shale oil reservoir in the lower sub-member of the third member of the Eocene Shahejie Formation and the upper sub-member of the fourth member of the Eocene Shahejie Formation in the Boxing Sag,Dongying depression,the geological data,such as thin sections,X-ray diffraction and the content of major and trace elements are analyzed.After the data analysis,the types of lithofacies and the evolution stage of sedimentary paleoenvironment are determined,and eight lithofacies assemblages are also divided based on the relationship between lithofacies and sedimentary environments.Then,the favorable lithofacies for shale oil exploration and development are determined based on the comparison of geological and engineering“sweet spot”parameters of different lithofacies assemblages.The results indicate that:(1)Six lithofacies types of organic-rich laminated argillaceous limestone and limestone mudstone,organic-rich layered argillaceous limestone and limestone mudstone,organic-poor massive argillaceous limestone and calcareous mudstone are mainly developed in the study area;(2)The sedimentary paleoenvironment with the characteristics of paleoclimate from arid to humid,little change in paleoredox,paleosalinity from high to low,and paleo-provenance from less to more exhibited eight evolutionary stages,corresponding to eight lithofacies assemblage types;(3)Lithofacies assemblage D and F,with high shale oil productivity,are the favorable in the Es3Land Es4U,respectively,and are in good agreement with the production practices.On the plane,the former is mainly distributed in the F159-F156-F160 well areas,and the latter is mainly distributed in FYP1-F116-F119 and F156-F159-F161 well area,which is a shale oil enrichment and high yield area in Boxing sag.

关 键 词：湖相页岩油 沉积古环境 岩相组合类型 平面分布 博兴洼陷 

分 类 号：TE121[石油与天然气工程—油气勘探]