四川盆地涪陵地区龙马溪组页岩微观孔隙结构定性定量研究  

Qualitative and quantitative study of micro-pore structures of Longmaxi Formation shale in Fuling area,Sichuan Basin

作　　者：杨文新[1] 李继庆[1] 赵江艳[1] 黄志红 YANG Wenxin;LI Jiqing;ZHAO Jiangyan;HUANG Zhihong(Research Institute of Petroleum Exploration and Development,SINOPEC Jianghan Oilfield Company,Wuhan,Hubei 430223,China)

机构地区：[1]中国石化江汉油田分公司勘探开发研究院,武汉430223

出　　处：《石油实验地质》2018年第1期97-102,共6页Petroleum Geology & Experiment

基　　金：国家科技重大专项(2016ZX05060);中国石化科技项目(P17014-1)资助

摘　　要：四川盆地涪陵地区龙马溪组页岩的孔隙结构复杂,常规单一测试技术已不能准确表征页岩的微观孔隙。运用氩离子抛光扫描电镜、压汞—吸附联测、核磁共振分析等多种方法,研究了涪陵地区龙马溪组页岩多尺度微观孔隙结构。结果表明,焦石坝页岩以灰黑色—黑色泥质粉砂岩及粉砂质泥岩为主,页岩发育有机质孔隙、无机孔隙和微裂缝3种孔隙类型;页岩孔隙大小分布是多尺度的,主要是微孔和中孔,孔隙直径小于20 nm的占总孔隙80%以上。核磁共振分析定量研究表明,龙马溪组页岩主力层孔隙半径明显大于非主力层,纵向上随井深增加,孔隙分布峰值向右偏移,页岩孔隙半径增大;平面上,主力层页岩孔隙直径峰值大于2 nm、孔隙度大于3%、含水饱和度低于40%的区块,储层保存条件好。The pore structure of Longmaxi shale in Fuling area of the Sichuan Basin is so complicated that conventional single test technology fails to accurately characterize the microscopic shale pores.The multi-scale microcosmic pore structure of Longmaxi shale in Fuling area was studied using SEM of an argon ion polished surface,pressure mercury-nitrogen adsorption,and nuclear magnetic resonance(NMR)analyses.The shale reservoirs in Jiaoshiba mainly contain gray black to black argillaceous siltstones and silty mudstones with three pore types:organic and inorganic pores,and micro-cracks.The pore size distribution of shale is of multiple-scales,most of which are micro pores and meso pores.Pore diameter<20 nm accounts for over 80%of the total.Quantitative NMR analysis showed that the main layer pore radius of Longmaxi Formation shale is significantly greater than the non-main layer.The pore size distribution increased with well depth.On the plane,the areas where the pore diameter peak value of the main layer shale is>2 nm,the porosity is>3%,and the water saturation of<40%showed favorable reservoir preservation conditions.

关 键 词：核磁共振 纳米孔隙 有机质 微观孔隙结构 页岩 龙马溪组 涪陵地区 四川盆地 

分 类 号：TE132.2[石油与天然气工程—油气勘探]