Thermal and microbial gas generation, accumulation and dissipation in coal basins: role of sorptive storage capacity evolution

该项目旨在增进对沉积盆地地质历史过程中煤成气的生成、运移和消散的理解，并特别考虑吸附和解吸过程对成分和同位素特征的影响。主要研究区域将是捷克西南部的上西里西亚盆地，那里的气体的赋存状态、热特征和微生物特征以前都有过记录。在该项目期间，将测试TDL(可调谐二极管激光)近红外(NIR)光谱在快速同时评估气体中甲烷和二氧化碳的同位素组成方面的适用性。根据甲烷和二氧化碳在不同组成和煤级的煤上的吸附特征，建立了描述煤层瓦斯饱和程度、瓦斯损失和补给的概念模型。分析了工艺对决定性控制因素的敏感性以及对原始气体成分的影响。将讨论自然和人为造成的气体泄漏对大气的影响、区域和全球甲烷和二氧化碳预算，以及对非常规能源的潜在贡献。

The project is designed to improve the understanding of generation, migration and dissipation of coal-related gas in the course of the geological history of sedimentary basins, with special consideration of the influence of sorption and desorption processes on the compositional and isotopic signature. The main study area will be the SW Upper Silesian Basin, Czechia, where the occurrence of gases of both, thermal and microbial signature has been documented previously. During this project the applicability of TDL (Tunable Diode Laser) NIR (Near Infrared) Spectroscopy for the rapid simultaneous assessment of the isotopic composition of methane and CO2 in gases shall be tested. Based on laboratory measurements of sorption characteristics of methane and CO2 on coals of different composition and rank, conceptual models will be developed to describe the degree of gas saturation, gas losses and replenishment of coal seams. The sensitivity of the processes to the decisive control factors and the influence on the original gas composition will be analysed. The results will be discussed with respect to the impacts of natural and anthropogenically induced gas leakage to the atmosphere, regional and global methane and CO2 budgets, and the potential contributions to unconventional energy sources.