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
周志军 1张国青 1崔春雪 2暴赫 3任帅 3王静怡4
作者信息
- 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
- 折叠
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N2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:N2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0.03～66.13 μm;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.
Abstract
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 Xinyish-en-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 N2 adsorption,high-pressure mercury injection,physical properties measurement,and other experimental methods.Additionally,we determined the physical prop-erty cutoffs through a comprehensive approach involving irreducible water saturation method,pressed mercury dis-placement 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 mer-cury injection experiment focuses on characterizing mesopores and macropores of shale,revealing a pore throat radi-us range of 0.03～66.13 μm.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Key words
shale oil/pore structure/lower limit of physical property/Jiyang Depression引用本文复制引用
基金项目
黑龙江省揭榜挂帅科技攻关计划(DQYT2022-JS-757)
出版年
2024
国家科技期刊平台
NSTL
万方数据