高邮凹陷花庄地区阜二段页岩储层孔喉结构特征研究  

Study on pore throat structure characteristics of shale reservoirs in the second member of Funing Formation in the Huazhuang area of Gaoyou Sag

作　　者：付茜[1] 段宏亮[1] 刘世丽[1] 仇永峰[1] 杨艳[1] 周进峰[1] 刘志敏 FU Qian;DUAN Hongliang;LIU Shili;QIU Yongfeng;YANG Yan;ZHOU Jinfeng;LIU Zhimin(Exploration and Development Research Institute of Jiangsu Oilfield Company,SINOPEC,Yangzhou 225009,China)

机构地区：[1]中国石化江苏油田分公司勘探开发研究院,江苏扬州225009

出　　处：《复杂油气藏》2024年第2期131-138,共8页Complex Hydrocarbon Reservoirs

基　　金：中国石化重大勘探导向项目(YTBXD-FCZY-2024-1-05-005);中国石油化工股份有限公司科技开发部项目(P23189);中国石化江苏油田分公司科技项目“苏北盆地常规油气剩余资源勘探方向及关键技术”(JS22001)。

摘　　要：高邮凹陷深凹-内坡带花庄地区阜二段(E_(1)f_(2))是苏北盆地页岩油勘探的有利地区和层段,为进一步明确花庄地区E_(1)f_(2)页岩储层特征,以有利区内系统取心井HY1井为依托,通过岩心观察,运用薄片鉴定、氩离子剖光-扫描电镜、高压压汞、氮气吸附以及核磁共振等多种方法联合精细表征页岩孔隙结构,分析了HY1井E_(1)f_(2)取心页岩段页岩的孔隙度、孔隙类型及连通性、孔喉特征、全尺度孔径大小等。研究表明,花庄地区E_(1)f_(2)发育3类10种孔隙类型,以无机孔为主;其中纹层状长英质灰云质混积页岩和灰云页岩孔隙度相对较大,碳酸盐岩粒间(内)孔和颗粒边缘孔更为发育,孔隙多为H2-H3型和H3型,连通性较好,喉道相对略大,孔隙结构呈三峰特征,中-大孔占比较高,孔径主体分布大于100 nm,储层条件最为有利,其发育层段可作为高邮凹陷花庄地区阜二段页岩油勘探“甜点”层之一。The second member of the Funing Formation(E_(1)f_(2))in the Huazhuang area of the deep concave-inner slope zone of the Gaoyou Sag is a favorable area and interval for shale oil exploration in the Subei Basin.In order to further clarify the characteristics of E_(1)f_(2) shale reservoir in the Huazhuang area,based on the systematic coring well HY1 in the favorable area,the pore structure of shale was finely characterized by using a combination of methods,such as thin-section identification,argon ion profiling and scanning electron microscopy,high-pressure mercury injection,nitrogen adsorption,and nuclear magnetic resonance,and the porosity,pore type and connectivity,pore throat characteristics,and full-scale pore size of shale in the E_(1)f_(2) core section of HY1 well were analyzed through core observation.The results show that E_(1)f_(2) in the Huazhuang area develops 3 categories and 10 types of pores,mainly inorganic pores.Among them,the porosity of laminar felsic lime-cloud mixed shale and lime-cloud shale has relatively large,and the intergranular(inner)and marginal pores of carbonate rock are more developed.The pores are mostly of H2-H3 type and H3 type,with good connectivity and relatively large throats.Three peaks characterize the pore structure,and medium-large pores account for a high proportion of the total number of pores.The main distribution of pore size is more than 100 nm.Therefore,the reservoir conditions are the most favorable,and its development interval can be regarded as one of the“sweet spots”of shale oil exploration in the second member of the Funing Formation in the Huazhuang area of the Gaoyou Sag.

关 键 词：孔隙结构 储层评价 页岩油 阜宁组二段 高邮凹陷 苏北盆地 

分 类 号：TE122[石油与天然气工程—油气勘探]