断陷湖盆细粒区页岩组构特征与页岩油富集成藏规律:以黄骅坳陷古近系为例  

Fabric characteristics and oil accumulation laws of shales in fine grained areas of faulted lacustrine basin:a case of Paleogene in Huanghua Depression

作　　者：蒲秀刚[1] 付永强[1] 时战楠 柴公权[1] 陈长伟[1] 姜文亚[1] 韩文中[1] 鄢继华[2] 官全胜[1] 许静[1] 董姜畅 PU Xiugang;FU Yongqiang;SHI Zhannan;CHAI Gongquan;CHEN Changwei;JIANG Wenya;HAN Wenzhong;YAN Jihua;GUAN Quansheng;XU Jing;DONG Jiangchang(PetroChina Dagang Oilfield Company,Tianjin 300280,China;School of Geoscience,China University of Petroleum(East China),Qingdao 266580,China)

机构地区：[1]中国石油大港油田公司,天津300280 [2]中国石油大学(华东)地球科学与技术学院,山东青岛266580

出　　处：《中南大学学报（自然科学版）》2024年第3期994-1007,共14页Journal of Central South University:Science and Technology

基　　金：国家重点研发计划项目(2022YFF0801204,2020YFA0710504)。

摘　　要：为明确断陷湖盆细粒区页岩微观组构特征及页岩油富集成藏规律,基于黄骅坳陷古近系孔二段、沙三段、沙一段3套页岩层系取心、测井、录井及试油等资料,综合利用矿物分析-场发射扫描电镜、氩离子抛光-场发射扫描电镜、聚焦离子束-场发射扫描电镜等技术手段,针对页岩样品开展多尺度、多维度精细表征,从微观、定量的角度系统分析了页岩矿物、有机质、孔隙及页岩油赋存特征,揭示了页岩油成藏富集规律并建立了富集模式。研究结果表明:在微观视域下,多类型矿物以“组分混合”和“组构叠置”构成复杂页岩类型;储集空间可划分为无机孔隙、有机孔隙和微裂缝3大类9小类,其中无机孔隙贡献率平均可达85%以上,孔径<50 nm的孔隙占据储集空间的主体;微观上有机质可划分为同沉积有机质、交生分异有机质和运移充填有机质3种类型;烃类主要赋存于长英质纹层、灰云质纹层或粉砂岩纹层中。基于矿物、有机质、储集空间、烃类4个要素的“四元耦合”页岩油富集成藏规律,建立了3类富集成藏模式。在该模式指导下,沧东凹陷孔二段实施多口水平井获高产,优质页岩油区块已经实现当今油价下的效益开发,歧口凹陷沙三段及沙一下亚段页岩油均获得重要突破,展示出黄骅坳陷古近系页岩油具有广阔的资源前景。In order to clarify the microscopic fabric characteristics and oil accumulation laws of shales in fine-grained areas of faulted lacustrine basin,based on the core data,logging data and oil testing data of three sets of shale successions in the second member of Kongdian Formation(Kong 2 for short),the third member and the first member of Shahejie Formation(Sha 3 and Sha 1 for short)of the Paleogene in Huanghua Depression,mineral analysis-field emission scanning electron microscope,argon ion polishing-field emission scanning electron microscope,focused ion beam-field emission scanning electron microscope etc.were used to characterize shale samples at multiple scales and dimensions in detail.The characteristics of shale minerals,organic matter,pores and shale oil occurrence were systematically analyzed from the microscopic and quantitative points of view,to reveal the accumulation and enrichment laws,and enrichment model of shale oil.The results show that in the microscopic view,complex types of shales are composed by multiple types of minerals mix and stack in laminae.The reservoir space in shale can be divided into nine types in three categories,including inorganic pore,organic pore and microfracture.Inorganic pores account for more than 85%on average,and pores with diameters less than 50 nm take up the majority of the reservoir space.Microscopically,there are three types of organic matter,synsedimentary organic matter,intergrown and differentiated organic matter,and migration and filling organic matter.Based on the characteristics,distribution and spatial interrelationship of four elements,including minerals,organic matter,reservoir space and hydrocarbons in shale strata,a"four-element coupling"reservoir accumulation and enrichment law is proposed,and three types of shale oil accumulation and enrichment models are sorted out.Under the guidance of these models,several horizontal wells have tapped high oil production in the Kong 2 Member in Cangdong Sag,and high-quality shale oil blocks have realized economically v

关 键 词：页岩油 孔店组二段 沙河街组三段 沙河街组一段 黄骅坳陷 组构特征 富集成藏规律 

分 类 号：TE12[石油与天然气工程—油气勘探]