School of Biotechnology and Food Technology, Hanoi University of Science and Technology, No. 1 Dai Co Viet, Hanoi, Viet Nam; Faculty of Materials Science and Engineering, Phenikaa University, Yen Nghia, Ha Dong, Hanoi, Viet Nam.
NUS Environmental Research Institute, National University of Singapore, 1 Create Way, Create Tower, #15-02, Singapore 138602, Singapore.
Sci Total Environ. 2022 Feb 10;807(Pt 3):151056. doi: 10.1016/j.scitotenv.2021.151056. Epub 2021 Oct 18.
An in-depth understanding of the hydrogeochemical characteristics of coal mines is helpful in establishing an effective and successful exploration program of coalbed methane (CBM). This study provides a comprehensive analysis of hydrogeological characteristics, characteristics of coalbed water, and characteristics of the coal sample from a coal seam located in the Red River Basin (RRB). These physicochemical characteristics along with the microbial composition of coalbed water were critically analyzed. A high concentration of chloride and sodium was found in the coalbed water, presumably due to the coal mine's stratigraphic association with marine or marine-transitional beds. A correlation between the occurrence of microbes and the chemical components in the coalbed water was established. The characteristics of the coal were systematically analyzed, including proximate, ultimate, and petrographic analyses. Based on the coal macerals, coal rank is classified as low-rank (sub-bituminous) with a vitrinite reflectance (R) of 0.36%, suggesting that this type of low-rank coal is favorable for biogenic methane generation. Pore structures and pore types were characterized using different methods, including low-temperature nitrogen adsorption/desorption (LTNA), mercury intrusion porosimetry (MIP), and scanning electron microscopy (SEM). Coal from the study area has microporous and macroporous features. Pore types of the coal were also characterized using SEM. The primary genetic pore types of the Red River coal include plant tissue holes and blowholes.
深入了解煤矿水文地球化学特征有助于建立一个有效和成功的煤层气（CBM）勘探计划。本研究对红河盆地（RRB）煤层的水文地质特征、煤层水特征和煤样特征进行了综合分析。对这些物理化学特征以及煤层水中的微生物组成进行了批判性分析。煤层水中发现了高浓度的氯和钠，这可能是由于煤矿的地层与海洋或海相过渡层有关。确定了微生物的存在与煤层水中化学组分之间的相关性。对煤的特征进行了系统分析，包括工业分析、元素分析和岩相分析。根据煤岩组成，将煤级归类为低阶（亚烟煤），镜质体反射率（R）为 0.36%，表明这种低阶煤有利于生物成因甲烷的生成。使用不同的方法对孔隙结构和孔隙类型进行了表征，包括低温氮吸附/解吸（LTNA）、压汞孔隙率（MIP）和扫描电子显微镜（SEM）。研究区的煤具有微孔和大孔特征。还使用 SEM 对煤的孔隙类型进行了表征。红河煤的主要成因孔隙类型包括植物组织孔和吹气孔。
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