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

杨文新; 李继庆; 赵江艳; 黄志红

doi:10.11781/sysydz201801097

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

doi: 10.11781/sysydz201801097

中国石化江汉油田分公司勘探开发研究院, 武汉 430223

基金项目: 国家科技重大专项（2016ZX05060）和中国石化科技项目（P17014-1）资助。

详细信息

作者简介:
杨文新(1967-),男,高级工程师,从事油气勘探开发研究。E-mail:ywx2369@sina.com。

中图分类号: TE132.2
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出版历程
- 收稿日期: 2017-10-09
- 修回日期: 2017-12-05
- 刊出日期: 2018-01-28

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

Research Institute of Petroleum Exploration and Development, SINOPEC Jianghan Oilfield Company, Wuhan, Hubei 430223, China

摘要

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。
- 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
Abstract: 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.
- nuclear magnetic resonance (NMR) /
- nano pore /
- organic matter /
- microscopic pore structure /
- shale /
- Longmaxi Formation /
- Fuling area /
- Sichuan Basin

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参考文献(13)

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