陆相富碳酸盐页岩结构特征与页岩油可动性——以济阳坳陷古近系沙河街组页岩为例  

Structural characteristics of continental carbonate-rich shale and shale oil movability:A case study of the Paleogene Shahejie Formation shale in Jiyang Depression,Bohai Bay Basin,China

作　　者：刘惠民[1] 包友书[2] 张守春[2] 李政[2] 李军亮[2] 王学军[2] 吴连波[2] 王勇[2] 王伟庆 朱日房[2] 张顺[2] 王鑫[2] LIU Huimin;BAO Youshu;ZHANG Shouchun;LI Zheng;LI Junliang;WANG Xuejun;WU Lianbo;WANG Yong;WANG Weiqing;ZHU Rifang;ZHANG Shun;WANG Xin(Sinopec Shengli Oilfield Company,Dongying 257001,China;Research Institute of Exploration and Development,Sinopec Shengli Oilfield Company,Dongying 257015,China)

机构地区：[1]中国石化胜利油田分公司,山东东营257001 [2]中国石化胜利油田分公司勘探开发研究院,山东东营257015

出　　处：《石油勘探与开发》2023年第6期1150-1161,共12页Petroleum Exploration and Development

基　　金：国家科技重大专项(2017ZX05049-004);中国石油化工集团有限公司项目(P22083,P23084)。

摘　　要：基于岩矿及地球化学分析、物性测定、镜下观测及不同薄层剥离测试等手段,剖析了渤海湾盆地济阳坳陷古近系沙河街组富碳酸盐页岩的结构特征,对比了不同类型页岩薄层的有机质丰度、储集性及含油性,划分出典型的页岩储-渗结构类型,并分析了不同类型页岩储-渗结构中油的可动性。取得以下认识:①泥质层与方解石层重复叠置是富碳酸盐页岩的主要结构类型,其中方解石层分为泥晶方解石层、粉晶方解石层和纤维状方解石脉。②泥质层是页岩有机质丰度及孔隙度的主要贡献者,具有最好的生烃能力、储集性能和含油性;而泥晶方解石层也具有较好的生烃潜力、储集性和含油性;粉晶方解石层和纤维状方解石脉具有较好的渗流输导性能。③济阳坳陷富碳酸盐页岩主要发育4种类型储-渗结构,各类储-渗结构中油的可动性强弱依次为:富粉晶方解石层页岩储-渗结构、富复合方解石层页岩储-渗结构、富纤维状方解石脉页岩储-渗结构、富泥晶方解石层页岩储-渗结构。济阳坳陷沙河街组页岩油在不同热演化阶段具有不同的储-渗结构类型勘探目标。Based on rock mineral and geochemical analysis,microscopic observation,physical property measurement,and thin layer separation test,the characteristics of typical layers of the Paleogene Shahejie Formation carbonate-rich shale in the Jiyang Depression were analyzed,and the organic matter abundance,reservoir properties,and oil-bearing properties of different layers were compared.Typical shale storage-seepage structures were classified,and the mobility of oil in different types of shale storage-seepage structure was compared.The results show that the repeated superposition of mud layer and calcite layer is the main layer structure of carbonate-rich shales.The calcite layer is divided into micritic calcite layer,microsparry calcite layer and fibrous calcite vein.The mud layer is the main contributor to the organic matter abundance and porosity of shale,with the best hydrocarbon generation potential,reservoir capacity,and oil-bearing property.The micritic calcite layer also has relatively good hydrocarbon generation potential,reservoir capacity and oil-bearing property.The microsparry calcite layer and fibrous calcite vein have good permeability and conductivity.Four types of shale storage-seepage structure are developed in the carbonate-rich shale,including microsparry calcite-rich structure,mixed calcite-rich structure,fibrous calcite vein-rich structure,and micritic calcite-rich structure,in a descending order of oil mobility.The exploration targets of carbonate-rich shale in the Jiyang Depression Shahejie Formation are different in terms of storage-seepage structure at different thermal evolution stages.

关 键 词：页岩油 富碳酸盐页岩 页岩结构 储-渗结构 页岩油可动性 古近系沙河街组 济阳坳陷 渤海湾盆地 

分 类 号：TE122[石油与天然气工程—油气勘探]