沁水盆地太原组—山西组页岩孔隙分形特征

doi:10.7657/XJPG20210505

新疆石油地质 ›› 2021, Vol. 42 ›› Issue (5): 548-553.doi: 10.7657/XJPG20210505

沁水盆地太原组—山西组页岩孔隙分形特征

闫高原¹^,²(), 张军建³, 路冠文², 全方凯²

1. 江苏建筑职业技术学院,江苏徐州 221116
2. 中国矿业大学煤层气资源与成藏过程教育部重点实验室,江苏徐州 221116
3. 山东科技大学地球科学与工程学院,山东青岛 266590

收稿日期:2020-02-02 修回日期:2020-12-15 出版日期:2021-10-01 发布日期:2021-09-28
作者简介:闫高原（1988-）,男,河南鹿邑人,讲师,博士,非常规油气地质,（Tel）15062109531（E-mail） ygycumt@163.com
基金资助:
国家科技重大专项(2016ZX05044002-003);煤层气资源与成藏过程教育部重点实验室(中国矿业大学)开放基金资助项目(2019-006)

Fractal Characteristics of Shale Pores From Taiyuan Formation to Shanxi Formation in Qinshui Basin

YAN Gaoyuan¹^,²(), ZHANG Junjian³, LU Guanwen², QUAN Fangkai²

1. Jiangsu Vocational Institute of Architectural Technology, Xuzhou, Jiangsu 221116, China
2. MOE Key Laboratory of Coal Bed Methane Resources and Hydrocarbon Accumulation, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China
3. School of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao, Shandong 266590, China

Received:2020-02-02 Revised:2020-12-15 Online:2021-10-01 Published:2021-09-28

摘要/Abstract

摘要：

基于沁水盆地太原组—山西组页岩样品的总有机碳含量、镜质体反射率和矿物组成分析资料,利用高压压汞实验进行测试,获取孔隙直径、孔隙体积、比表面积、孔隙度等孔隙结构参数,并在此基础上利用Sierpinski地毯模型对页岩孔隙结构进行分形处理。结果表明,太原组—山西组页岩样品压汞分形曲线可以分为AB段、BC段和CD段,其中BC段对应的孔隙直径为21~6 035 nm;利用Sierpinski地毯模型进行分形处理时,BC段孔隙结构表征性最好;在21~6 035 nm孔隙直径范围内,黏土矿物含量越高的页岩,其孔隙结构的非均质性越强,孔隙结构的复杂程度也越高;孔隙体积、比表面积和孔隙度与分形维数均呈负相关关系,三者之中孔隙体积和孔隙度与分形维数相关性较好,可以作为间接判断孔隙结构复杂程度的依据。

关键词: 沁水盆地, 太原组, 山西组, 页岩, 高压压汞实验, 孔隙结构, 孔隙度, 分形维数

Abstract:

Based on the data of shale samples, including TOC, vitrinite reflectance and mineral composition, and through high-pressure mercury intrusion experiment, the pore structure parameters such as pore diameter, pore volume, specific surface area and porosity were obtained from the Taiyuan formation to the Shanxi formation in the Qinshui basin, and then fractal analysis was performed on the shale pore structure with a Sierpinski carpet model. The results show that the fractal mercury intrusion curve of the shale samples from the Taiyuan formation to the Shanxi formation can be divided into 3 sections such as AB, BC and CD. The pore diameter corresponding to the BC section is 21 to 6,035 nm. When performing fractal processing on a Sierpinski model, the pore structure of the BC section has the best characterization. In the range from 21 to 6,035 nm, the higher the clay mineral content, the stronger the heterogeneity and the more complicated of the pore structure. Pore volume, specific surface area and porosity are all negatively correlated with fractal dimension. Among them, pore volume and porosity have a good correlation with fractal dimension, and can be used as an indirect criterion for judging the complexity of pore structure.

Key words: Qinshui basin, Taiyuan formation, Shanxi formation, shale, high-pressure mercury intrusion experiment, pore structure, porosity, fractal dimension

中图分类号:

TE112.23

闫高原, 张军建, 路冠文, 全方凯. 沁水盆地太原组—山西组页岩孔隙分形特征[J]. 新疆石油地质, 2021, 42(5): 548-553.

YAN Gaoyuan, ZHANG Junjian, LU Guanwen, QUAN Fangkai. Fractal Characteristics of Shale Pores From Taiyuan Formation to Shanxi Formation in Qinshui Basin[J]. Xinjiang Petroleum Geology, 2021, 42(5): 548-553.

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沁水盆地太原组—山西组页岩孔隙分形特征

Fractal Characteristics of Shale Pores From Taiyuan Formation to Shanxi Formation in Qinshui Basin

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