Bibliographic Details
| Title: |
Effect of coal facies on pore structure heterogeneity of coal measures: Quantitative characterization and comparative study |
| Authors: |
Zhao Lingyu, Chang Xiangchun, Li Dejiang, Zhang Junjian, Vandeginste Veerle, Yao Peng, Su Jitong |
| Source: |
Open Geosciences, Vol 16, Iss 1, Pp 169-84 (2024) |
| Publisher Information: |
De Gruyter, 2024. |
| Publication Year: |
2024 |
| Collection: |
LCC:Geology |
| Subject Terms: |
nanopore structure, fractal, coal facies, heterogeneity, tarim basin, Geology, QE1-996.5 |
| More Details: |
Coal facies is an important indicator reflecting depositional environment of coal, which affects pore distribution. The effect of coal facies on the nanopore structure is essential for deep coalbed methane drainage. In this study, 13 coal samples from the Upper Triassic Talichik Formation in the Kubei-Bashi tectonic belt were collected. The coal facies type is determined based on the coal phase parameters (TPI–GI diagram). On this basis, nanopore diameter distribution is determined by using liquid nitrogen adsorption and CO2 adsorption experiments. Then, single and multi-fractal dimensions are studied by using fractal theories. The results are as follows. The coal facies are classified into three types, namely low swampy reed phases (Type A, GI > 5, TPI < 1), wetland herbaceous swamp phases (Type B, GI < 5, TPI < 1), and dry forest swamp phases (Type C, GI < 1, TPI > 1). The pore volume percentage of micropores is similar amongst the three facies types, showing that the coal facies has little effect on the pore structure of micropores. The pore volume and specific surface area of meso-pores are the largest for coal facies A, indicating the most developed meso-pores in coal facies A. However, the pore volume percentage with a diameter of 2–10 nm in coal facies A is the lowest among the three coal facies. Above all, the coal reservoir under the wet overlying water depositional environment of coal facies A offers a relatively large pore volume as well as a specific surface area, which is more favorable for the exploration and development of coalbed methane; therefore, it is the advantageous coal reservoir in the study area. |
| Document Type: |
article |
| File Description: |
electronic resource |
| Language: |
English |
| ISSN: |
2391-5447 |
| Relation: |
https://doaj.org/toc/2391-5447 |
| DOI: |
10.1515/geo-2022-0738 |
| Access URL: |
https://doaj.org/article/376d6955053f4a7095b35635acdc4050 |
| Accession Number: |
edsdoj.376d6955053f4a7095b35635acdc4050 |
| Database: |
Directory of Open Access Journals |
