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Coal characterization and coalbed methane potential of the Chico-Lomã Coalfield, Paraná Basin, Brazil – Results from exploration borehole CBM001-CL-RS
Energy Exploration & Exploitation ( IF 2.7 ) Pub Date : 2020-06-27 , DOI: 10.1177/0144598720931167 W Kalkreuth 1 , J Levandowski 1 , P Weniger 2 , B Krooss 3 , R Prissang 4 , A Lima da Rosa 1
Energy Exploration & Exploitation ( IF 2.7 ) Pub Date : 2020-06-27 , DOI: 10.1177/0144598720931167 W Kalkreuth 1 , J Levandowski 1 , P Weniger 2 , B Krooss 3 , R Prissang 4 , A Lima da Rosa 1
Affiliation
The aim of this study was to determine the coal characteristics in the Chico-Lomã coalfield, Brazil and to evaluate the potential of natural gas associated with the coal seams (CBM), by carrying out a test well (CBM001-CL-RS) for collecting coal samples, followed by gas desorption measurements, and petrographical and chemical analyses of the coals and their methane adsorption capacities. The gas collected was analyzed for gas composition, stable carbon and hydrogen isotopes. The results indicate a cumulative coal thickness of 11.46 m in well CBM001-CL-RS, associated with an igneous intrusion of 10 m thickness. In the contact zone with the intrusion, the organic matter is severely altered with partial transformation of the coal to natural coke at distances less than 2 m from the intrusion. The ash content, based on proximate analysis, shows a variation from 29.1 to 82.8 wt.%. The sulphur content ranges from 0.43 to 3.89 wt.% and shows higher values in samples from the top of the Rio Bonito Formation. The gas desorption measurements range from 0.05 to 0.74 cm3/g, with methane being the predominant gas (>90%). A thermal origin of the gas is suggested by C and H isotopes and the C1 (methane) to C3 (propane) hydrocarbon distribution. The methane adsorption capacity of the samples varies from 2.50 to 6.50 cm3/g. Changes in microporosity related to thermal alteration may have a significant impact on the gas-holding capacity of samples located near the contact to the intrusion. For the study area, a 3D geological model was generated to estimate the volume of coal in the coalfield, followed by assessment of the gas volume associated with the coal. Based on the 3D model, a preliminary appraisal indicates resources of 7.2 billion tons of coal for the Chico-Lomã coalfield, associated with 2.7 billion m3 of gas.
中文翻译:
巴西巴拉那盆地 Chico-Lomã 煤田的煤炭特征和煤层气潜力——勘探钻孔 CBM001-CL-RS 的结果
本研究的目的是确定巴西 Chico-Lomã 煤田的煤炭特征,并通过测试井 (CBM001-CL-RS) 评估与煤层 (CBM) 相关的天然气的潜力。收集煤样,然后进行气体解吸测量,并对煤及其甲烷吸附能力进行岩相和化学分析。分析收集的气体的气体成分、稳定的碳和氢同位素。结果表明,CBM001-CL-RS 井的累积煤层厚度为 11.46 m,与 10 m 厚度的火成岩侵入有关。在与侵入体接触的区域,有机质发生严重变化,煤在距侵入体不到 2 m 的距离部分转化为天然焦炭。灰分含量,基于近似分析,显示从 29.1 到 82.8 wt.% 的变化。硫含量范围为 0.43 至 3.89 wt.%,在来自 Rio Bonito 地层顶部的样品中显示出更高的值。气体解吸测量范围为 0.05 至 0.74 cm3/g,其中甲烷是主要气体 (>90%)。C 和 H 同位素以及 C1(甲烷)至 C3(丙烷)烃分布表明气体的热源。样品的甲烷吸附容量从 2.50 到 6.50 cm3/g 不等。与热变有关的微孔隙率变化可能对位于侵入体接触点附近的样品的气体保持能力产生重大影响。对于研究区,生成了一个 3D 地质模型来估计煤田中的煤体积,然后评估与煤相关的气体体积。基于3D模型,
更新日期:2020-06-27
中文翻译:
巴西巴拉那盆地 Chico-Lomã 煤田的煤炭特征和煤层气潜力——勘探钻孔 CBM001-CL-RS 的结果
本研究的目的是确定巴西 Chico-Lomã 煤田的煤炭特征,并通过测试井 (CBM001-CL-RS) 评估与煤层 (CBM) 相关的天然气的潜力。收集煤样,然后进行气体解吸测量,并对煤及其甲烷吸附能力进行岩相和化学分析。分析收集的气体的气体成分、稳定的碳和氢同位素。结果表明,CBM001-CL-RS 井的累积煤层厚度为 11.46 m,与 10 m 厚度的火成岩侵入有关。在与侵入体接触的区域,有机质发生严重变化,煤在距侵入体不到 2 m 的距离部分转化为天然焦炭。灰分含量,基于近似分析,显示从 29.1 到 82.8 wt.% 的变化。硫含量范围为 0.43 至 3.89 wt.%,在来自 Rio Bonito 地层顶部的样品中显示出更高的值。气体解吸测量范围为 0.05 至 0.74 cm3/g,其中甲烷是主要气体 (>90%)。C 和 H 同位素以及 C1(甲烷)至 C3(丙烷)烃分布表明气体的热源。样品的甲烷吸附容量从 2.50 到 6.50 cm3/g 不等。与热变有关的微孔隙率变化可能对位于侵入体接触点附近的样品的气体保持能力产生重大影响。对于研究区,生成了一个 3D 地质模型来估计煤田中的煤体积,然后评估与煤相关的气体体积。基于3D模型,