页岩储层孔隙结构表征及物性下限确定方法及应用  

Methods and Applications for Characterizing Pore Structure and Determining Physical Property Lower Limit in Shale Reservoirs

作　　者：周志军[1] 张国青 崔春雪 暴赫 任帅 王静怡 Zhou Zhijun;Zhang Guoqing;Cui Chunxue;Bao He;Ren Shuai;Wang Jingyi(Key Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development(Northeast Petroleum University),Ministry of Education,Daqing,Heilongjiang 163318,China;Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China;CNOOC China Limited,Tianjin branch,Tianjin 300452,China;PetroChina Daqing Oilfield Co.,Ltd.,Daqing,Heilongjiang 163318,China)

机构地区：[1]东北石油大学陆相页岩油气成藏及高效开发教育部重点实验室,黑龙江大庆163318 [2]中国科学院力学研究所,北京100190 [3]中海石油(中国)有限公司天津分公司,天津300452 [4]中国石油大庆油田有限责任公司,黑龙江大庆163318

出　　处：《特种油气藏》2024年第4期96-102,共7页Special Oil & Gas Reservoirs

基　　金：黑龙江省揭榜挂帅科技攻关项目“古龙页岩油压驱机理研究”(DQYT2022-JS-757)。

摘　　要：针对页岩储层孔隙结构和物性下限认识不清,严重制约了页岩油储量计算及高效开发的问题,以济阳坳陷古近系沙河街组新义深9、利页1、樊页1井为研究对象,利用N_(2)吸附、高压压汞、物性测定等实验方法,对页岩储层的孔隙结构进行全尺寸表征,并综合运用束缚水饱和度法、压汞排驱压力法、最小流动孔喉半径法和试油法确定页岩储层的物性下限。研究表明:N_(2)吸附实验主要表征页岩样品的小孔,研究区孔隙形态主要有墨水瓶形、过渡形及平板状夹缝形,主要发育纳米级孔隙,孔隙半径为1.50~40.00 nm,平均孔隙半径为16.00 nm;高压压汞实验主要表征页岩样品的中孔和宏孔,孔喉半径为0.03~66.13μm;综合计算页岩储层孔隙度下限为1.30%~3.82%,渗透率下限为0.03~0.12 mD,最小流动孔喉半径为14.60~23.50 nm,平均值为17.76 nm。研究成果可为济阳坳陷页岩油的储量计算及储层评价提供参数指标和技术支撑。Inadequate comprehension of the pore structure and physical properties of shale reservoirs impedes precise calculation of shale oil reserves and efficient development seriously.This study focuses on the core holes of Xinyishen-9,Liye-1,and wells Fanye-1 in the Paleogene Shahejie Formation within the Jiyang Depression.The pore structure of shale reservoirs is comprehensively characterized using N_(2) adsorption,high-pressure mercury injection,physical properties measurement,and other experimental methods.Additionally,we determined the physical property cutoffs through a comprehensive approach involving irreducible water saturation method,pressed mercury displacement method,minimum flow pore-throat radius method,and oil testing method.The findings indicate that the nitrogen adsorption experiment primarily characterizes the small pores of shale samples.The pore morphology in the study area predominantly comprises ink bottle,transition,and flat types,mainly featuring nano-scale pores with a radius ranging from 1.50 to 40.00 nm and an average pore radius of 16.00 nm.Moreover,the high-pressure mercury injection experiment focuses on characterizing mesopores and macropores of shale,revealing a pore throat radius range of 0.03~66.13μm.The lower limit of shale reservoir porosity falls within the range of 1.30%to 3.82%,while permeability′s cutoff is between 0.03~0.12 mD,the minimum flow pore-throat radius is 14.60~23.50 nm and average value is 17.76 nm.The research outcomes offer valuable parameter indexes and technical support for reserve calculation and reservoir evaluation in Jiyang Depression′s shale oil exploration.

关 键 词：页岩油 孔隙结构 物性下限 济阳坳陷 

分 类 号：TE311[石油与天然气工程—油气田开发工程]