基于流体吸入实验的页岩纳米孔隙连通性分析方法

张文涛; 胡文瑄; 鲍芳; 俞凌杰; 范明; 张庆珍

doi:10.11781/sysydz202003415

基于流体吸入实验的页岩纳米孔隙连通性分析方法

doi: 10.11781/sysydz202003415

张文涛^{1, 2,},
胡文瑄¹,
鲍芳²,
俞凌杰²,
范明²,
张庆珍²

1.
南京大学地球科学与工程学院南京 210046
2.
中国石化石油勘探开发研究院无锡石油地质研究所, 江苏无锡 214126

基金项目:

国家自然科学基金 U1663202

国家自然科学基金 41690133

国家油气重大专项 2017ZX05036002

详细信息

作者简介:
张文涛(1982-), 男, 副研究员, 主要从事页岩油气地质研究。E-mail: zhangwt.syky@sinopec.com

中图分类号: TE135
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- 被引次数: 0
出版历程
- 收稿日期: 2020-01-08
- 修回日期: 2020-04-13
- 刊出日期: 2020-05-28

A method for analyzing nanopore connectivity of shale using a fluid suction experiment

1.
School of Earth Sciences and Engineering, Nanjing University, Nanjing, Jiangsu 210046, China
2.
Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China

摘要

摘要: 提出了基于含示踪剂流体吸入实验的页岩连通性分析方法。通过真空吸入的方式使氯金酸钠溶液进入页岩孔隙中，并使之转化为固态金，将完成实验后的样品表面进行氩离子抛光处理，并在场发射扫描电镜下观察金的分布，可以获得页岩中连通孔隙在纳米尺度上的特征。根据四川盆地上奥陶统五峰组-下志留统龙马溪组2个岩心样品的实验结果，认为其连通网络可分为三级系统。有机质内部孔隙连通性与孔隙发育程度有关，喉道半径小，流动效率不高。粒缘缝主要分布在颗粒矿物边缘、有机质与矿物之间以及片状黏土矿物边缘，是流体流动的有利通道，有机质孔通过粒缘缝相互连通。微裂缝的发育能够很好地改善页岩孔隙的连通性，是流体流动的优势通道。页岩连通性具有各向异性，页岩孔隙在平行层理方向的连通性大大优于垂直层理方向。
- 流体吸入 /
- 连通性 /
- 喉道 /
- 粒缘缝 /
- 微裂缝 /
- 各向异性
Abstract: A method for analyzing the pore connectivity of shale based on a suction experiment of tracer fluid is presented. Sodium chloraurate solution is absorbed into shale pores which have been previously evacuated, and then the solute in the pores is converted to gold by heating. After the suction experiment, the sample surface is polished and analyzed with scanning electron microscopy, in order to get the characteristics of connected pores at the nano-scale. The results of two core samples from the Wufeng-Longmaxi formations in the Sichuan Basin show the connected network in shale could be divided into three parts. The interior connectivity of pores in organic matter is related to the density of pores, and organic matter normally has low flow efficiency because of narrow throat radius. Fractures distributed at grain boundaries such as minerals, organic matter and clay sheets are advantageous pathways, and organic pores are connected by grain boundaries. The development of micro-cracks/fractures, which have high permeability, could significantly improve shale connectivity. Shale pore connectivity has great anisotropy, which means connectivity parallel to bedding is much better than that vertical to bedding.
- fluid suction /
- connectivity /
- pore throat /
- grain boundary fracture /
- micro fracture /
- anisotropy

HTML全文

图 1 流体吸入装置示意

Figure 1. Schematic diagram of fluid suction device

下载: 全尺寸图片幻灯片

图 2 扫描电镜下实验样品的孔隙特征

a，b.样品WY11-9-8;c，d.样品JY11-13

Figure 2. Characteristics of pores in samples using SEM

下载: 全尺寸图片幻灯片

图 3 四川盆地五峰组—龙马溪组页岩样品WY11-9-8的连通孔隙特征

Figure 3. Characteristics of connected pores in sample WY11-9-8 in Wufeng-Longmaxi formations in Sichuan Basin

下载: 全尺寸图片幻灯片

图 4 四川盆地五峰组—龙马溪组页岩样品JY11-13的连通孔隙特征

Figure 4. Characteristics of connected pores in sample JY11-13 in Wufeng-Longmaxi formations in Sichuan Basin

下载: 全尺寸图片幻灯片

图 5 四川盆地五峰组—龙马溪组页岩样品WY11-9-8的FIB-SEM三维微观结构

蓝色为提取的有机质，红色为提取的孔隙

Figure 5. 3D microstructure of sample WY11-9-8 in Wufeng-Longmaxi formations in Sichuan Basin using FIB-SEM

下载: 全尺寸图片幻灯片

表 1 实验样品基本信息

Table 1. Basic sample information

样品号	地区	深度/m	w(TOC)/%	孔隙度/%	视密度/(g·mL^-1)	矿物组成/%
样品号	地区	深度/m	w(TOC)/%	孔隙度/%	视密度/(g·mL^-1)	黏土	石英	钾长石	斜长石	方解石	白云石	黄铁矿	硬石膏
WY11-9-8	威远	3 755.50	4.34	7.69	2.57	28	41		1	6	20	4
JY11-13	焦石坝	2 325.35	4.10	6.75	2.55	41	40	1	5	3	5	4	1

下载: 导出CSV

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