期刊
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
卷 53, 期 -, 页码 32-44出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jngse.2018.02.025
关键词
Vitrinite-rich; Inertinite-rich; Adsorption-pores; Anthracite; Difference
资金
- Open Foundation of Key Laboratory of Tectonics and Petroleum Resources (China University of Geosciences) [TPR-2016-04]
- Open Foundation of Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Mineral, (Shandong University of Science and Technology) [DMSM2017031]
- National science and technology major project [2017ZX05039001-002]
- National Natural Science Foundation of China [41772150]
To further understand the fundamental difference of adsorption-pores systems between vitrinite- and inertinite-rich anthracite, six coal core samples with > 85% vitrinite and three samples with > 80% inertinite were collected from coalbed methane wells in the southern Sichuan basin, China, by macerals analysis method. The differences of pore genetic types, pores shapes, pore surfaces roughness, pore-size distribution, specific surface area, total pore volume, physical properties, and CH4 adsorption capacity between vitrinite- and inertinite-rich samples, were studied via ESEM observation, low-temperature N-2 adsorption experiments, NMR tests, and CH4 isothermal adsorption experiments. Results show that plant tissue holes are easier to observe in inertinite than vitrinite, and blowholes, breccia pores and broken pores are all common in vitrinite and rare in inertinite of the study coals. Both vitrinite- and inertinite-rich coal samples exhibit complex nano-pore structures, and pore shapes in inertinite-rich coals are more special than those in vitrinite-rich samples. Fractal dimensions analysis from the N-2 adsorption isotherms indicates that inertinite-rich coals have the higher surfaces roughness of irregular pores than vitrinite-rich coals in the P/P-o intervals of 0.5-1. In addition, it can be predicted that pores of D2 and D3 type hysteresis loops with diameters of < 2.76 nm each are almost semi-closed pores, and the narrow neck in ink bottle pores generally measure 2.76 nm. Nano-pores measuring < 4 nm comprise the largest proportion among all adsorption-pores. The proportion of pores with diameters of < 0.64 nm each in inertiniterich coals is greater than that in vitrinite-rich coals. NMR porosities, permeabilities, and irreducible water saturations between vitrinite- and inertinite-rich coals are all similar, and the porosities display a good exponential positive correlation with the permeabilities. Vitrinite- and inertinite-rich samples are both characterized by a large V-L , and there are positive relationships of V-L with vitrinite and inertinite, indicating the CH4 adsorption capacity of organic macerals is much stronger than that of inorganic minerals in anthracite.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据