Characterization method of shale pore structure based on nano-CT: a case study of Well JY-1

doi:10.7623/syxb201811005

Acta Petrolei Sinica ›› 2018, Vol. 39 ›› Issue (11): 1253-1261.DOI: 10.7623/syxb201811005

• Petroleum Exploration • Previous Articles Next Articles

Characterization method of shale pore structure based on nano-CT: a case study of Well JY-1

Gou Qiyang¹, Xu Shang¹, Hao Fang², Lu Yangbo¹, Zhang Aihua¹, Wang Yuxuan¹, Cheng Xuan¹, Qing Jiawei¹

1. Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education;Faculty of Earth Resources, China University of Geosciences, Hubei Wuhan 430074, China;
2. School of Geosciences, China University of Petroleum, Shandong Qingdao 266580, China

Received:2018-05-03 Revised:2018-08-20 Online:2018-11-25 Published:2018-12-10

纳米CT页岩孔隙结构表征方法——以JY-1井为例

苟启洋¹, 徐尚¹, 郝芳², 陆扬博¹, 张爱华¹, 王雨轩¹, 程璇¹, 青加伟¹

1. 构造与油气资源教育部重点实验室中国地质大学资源学院湖北武汉 430074;
2. 中国石油大学地球科学与技术学院山东青岛 266580

通讯作者: 徐尚,男,1985年5月生,2009年获长江大学资源勘查工程专业学士学位,2015年获中国石油大学(北京)地质资源与地质工程专业博士学位,现为中国地质大学(武汉)资源学院副教授,主要从事油气成藏机理和非常规油气地质研究。Email:xushang0222@163.com
作者简介:苟启洋,男,1994年9月生,2017年获中国地质大学(北京)矿产普查与勘探专业学士学位,现为中国地质大学(武汉)资源学院硕士研究生,主要从事非常规油气研究。Email:1219294089@qq.com
基金资助:
国家自然科学基金重大项目（No.41690134，No.41690131）、国家自然科学基金青年科学基金项目（No.41702155）和国家科技重大专项（2016ZX05034-002-003）资助。

Abstract

Abstract:

An analysis on nanoporous structure of organic-rich shale is the basis for evaluating the reserving properties of shale reservoirs and the exploration and development potential of shale gas resources. In this study, the nano-CT and 3D reconstruction technique is used to evaluate the shale pore characteristics and connectivity of the Lower Silurian Longmaxi Formation in the Jiaoshiba area of Sichuan Basin. The experimental results show that:(1)nano-CT can display the three-dimensional spatial structure of shale pores, and will be more conducive to characterize the shale pore characteristics in combination with other experimental methods; (2)based on nano-CT, four components including matrix minerals, organic matter, pores, and high-density minerals (such as pyrite)can be distinguished in shale samples with the volume ratio of 89.20%, 6.22%, 2.71% and 1.87% respectively; (3)the pore sizes evaluated by nano-CT range from 79 nm to 4.7 μm, dominated by 100~500 nm, mainly including organic pores and inorganic pores; (4)strong heterogeneity exists in shale pore, generally with better connectivity, dominated by grade Ⅲ connectivity domains.

Key words: shale, nano-CT, pore structure characterization, pore connectivity, Jiaoshiba area

摘要：

分析富有机质页岩的纳米孔隙结构是评价页岩储集性能和页岩气资源勘探开发潜力的基础。利用纳米CT及三维重构技术评价四川盆地焦石坝地区下志留统龙马溪组页岩的孔隙特征及连通性，结果表明：①纳米CT可以展现页岩孔隙的三维空间结构，结合其他实验方法更有利于表征页岩的孔隙特征；②基于纳米CT可将焦石坝页岩样品的组分分为基质矿物、有机质、孔隙和高密度矿物（如黄铁矿），其体积比分别为89.20%、6.22%、2.71%和1.87%；③焦石坝页岩的孔径分布范围为79~4 700 nm，以100~500 nm为主，包括有机孔隙和无机孔隙；④焦石坝页岩孔隙的非均质性较强，总体具有较好的连通性，以Ⅲ级连通域为主。

关键词: 页岩, 纳米CT, 孔隙结构表征, 孔隙连通性, 焦石坝地区

CLC Number:

TE122.2

Gou Qiyang, Xu Shang, Hao Fang, Lu Yangbo, Zhang Aihua, Wang Yuxuan, Cheng Xuan, Qing Jiawei. Characterization method of shale pore structure based on nano-CT: a case study of Well JY-1[J]. Acta Petrolei Sinica, 2018, 39(11): 1253-1261.

苟启洋, 徐尚, 郝芳, 陆扬博, 张爱华, 王雨轩, 程璇, 青加伟. 纳米CT页岩孔隙结构表征方法——以JY-1井为例[J]. 石油学报, 2018, 39(11): 1253-1261.

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Characterization method of shale pore structure based on nano-CT: a case study of Well JY-1

纳米CT页岩孔隙结构表征方法——以JY-1井为例

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