Geological Controls on the Gas Content and Permeability of Coal Reservoirs in the Daning Block, Southern Qinshui Basin

Guo, Zhiqi; Cao, Yongzhi; Zhang, Zheng; Dong, Shi

doi:10.1021/acsomega.2c00371

Cited by 11 publications

(11 citation statements)

References 76 publications

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“…Previous studies have identified various factors that impact the productivity of CBM wells, including coal seam thickness, depth of cover, gas content, permeability, porosity, geological structure, hydrogeological conditions, drilling and completion techniques, reservoir transformation methods, well pattern deployment strategies, production drainage systems, etc (Guo et al 2022;Jin et al 2022;Zhang, 2018;Zhang, 2022). There are significant differences in controlling factors of CBM productivity in different coal blocks; research on controlling factors based on the block or even well group scale is of great significance for improving the production of a single well.…”

Section: Analysis Of Influencing Factorsmentioning

confidence: 99%

“…Geological factors include reservoir properties and geological conditions, subdivided into coal seam thickness, depth of cover, gas content, permeability, porosity, geological structure, hydrogeological conditions, etc. Engineering factors include drilling and completion methods, reservoir transformation techniques, well pattern deployment methods, production drainage systems, and other stimulation measures (Guo et al, 2022;Jin et al, 2022;Zhang, 2018Zhang, , 2022. Different coal blocks have different geological backgrounds and engineering conditions, and the main controlling factors of CBM productivity are various.…”

Section: Introductionmentioning

confidence: 99%

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Productivity characteristics and controlling factors of coalbed methane vertical well in a coal block of Qinshui Basin

Chen,

Wu,

Huo

et al. 2023

Energy Exploration & Exploitation

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Although a coal block in the Qinshui Basin is a key location for coalbed methane (CBM) exploration and development, the productivity of various vertical wells varies significantly. The productivity characteristics of 636 vertical wells were analyzed better to understand the effects of different variables on CBM productivity. Grey correlation analysis was used to identify the key determinants of CBM well productivity. The findings indicate that vertical well production is below average, with more than 50% serving as water wells. The production of the central well area is high in the west and south. Highly productive wells are significantly influenced by geological conditions, primarily located in areas with high gas content, moderate cover depth, high permeability, and elevated water head. The engineering factor that exerts the most significant influence on productivity is the rate of liquid level drop. Based on grey correlation analysis, the primary determinants of CBM vertical well production are permeability and cover depth.

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Section: Analysis Of Influencing Factorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Productivity characteristics and controlling factors of coalbed methane vertical well in a coal block of Qinshui Basin

Chen,

Wu,

Huo

et al. 2023

Energy Exploration & Exploitation

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“…Coal properties such as ash yield and moisture content have effect on methane content. In general, the ash yield is equally referred as mineral matter; a gangue without adsorbing capacity that may affect gas adsorption in a coal surface [16]- [18]. Thus, the higher ash yields may reduce the gas storage capacity of coals.…”

Section: Fugitive Emissionmentioning

confidence: 99%

Greenhouse Gasses Emission from Coal Mining Operation in North Kalimantan, Indonesia

Lusantono,

Anggara,

Amijaya

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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Greenhouse gasses (GHG) are gases that could trap heat in the atmosphere and mainly made up of carbon dioxide (CO¬2¬) and methane (CH4). Coal is still one of the primary energy sources in several countries such as South Africa (71%), China (57%), Australia (30%), and Indonesia (44%). Therefore, coal mining operation is indicated as one of the biggest GHG contributor in the world. However, coal as commodity also indicated emitting GHG emission sequentially but its pathways are still debatable. GHG emission from coal mainly stated as an emission factor on both CO2 and CH4 because of coal combustion and/or existing gas in the coal bearing strata. The study of GHG emission or so-called Carbon Emission has been done based on several regions, coal rank, and condition. This study focuses on identify and projecting the GHG emission based on coal mining operation plan in North Kalimantan Province, Indonesia. This study aims to identify and adds more broader perspective about GHG emission from coal mining. The GHG emission estimation is based form Tier 1 IPCC Calculation method and estimated from a different scenario of production along the year. The GHG emission in this study estimated from fuel combustion and fugitive emission. The total emission estimated from this study was 1.31 × 10-02 kg CO2eq / kg coal.

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“…China is rich in CBM resources, with a geological resource of 30.05 × 10 12 m 3 , and the development and utilization of CBM can optimize China’s energy structure and reduce greenhouse gas emissions. , China has made great progress in the CBM accumulation mechanism and development methods, such as in the Ordos Basin, − Qinshui Basin, , and Jungar Basin. , However, to achieve China’s goal of carbon neutrality by 2060, the scale of CBM development in China still needs to be urgently upgraded. Some areas with a low priority for exploration become the current focus of the investigation, such as the Zhuozishan coalfield at the western margin of the Ordos Basin.…”

Section: Introductionmentioning

confidence: 99%

Coalbed Methane Enrichment Characteristics and Exploration Target Selection in the Zhuozishan Coalfield of the Western Ordos Basin, China

et al. 2022

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The Zhuozishan coalfield at the western margin of the Ordos Basin is one of the main coal-mining areas in China, and recent explorations have revealed the great potential for coalbed methane (CBM) resources in its Carboniferous and Permian strata. In this paper, the controlling factors of CBM enrichment of the major coals are studied in this coalfield and the CBM resources are estimated based on the analysis of the coal petrology and compilation of literature data on the gas content. The result of the coal petrology analysis of 10 samples shows that the vitrinite content of No. 16 coal (71.9–77.3%) is higher than that of No. 9 coal (59.1–65.1%), and the inertinite content of No. 16 coal (18.9–23.5%) is lower than that of No. 9 coal (30.1–34.9%). The R o,max value of No. 16 coal (1.18–1.35%) is higher than that of No. 9 coal (1.04–1.13%), and both coals are of medium rank. Due to greater thickness, deeper burial depth, and better coal petrology characteristics, the No. 16 coal seam of the Taiyuan Formation is selected as the major coal seam for CBM resource estimation, which has a thickness of 1–6 m and a present-day burial depth of 200–1100 m. The gas content of this coal seam varies mostly between 4 and 10 m3/t. Positive correlation between the coal seam thickness as well as present-day burial depth and the gas content suggests that the thick and deeply buried coal seams are favorable for CBM preservation. The ash yield shows an insignificant negative correlation with the gas content, indicating that ash yield is not an important factor for CBM enrichment. The syncline hinges located below the thrust zones show higher gas content due to greater burial depths. In contrast, the anticline hinges at shallower depths tend to have lower gas contents. Based on the combined information about sedimentary environments, structural patterns, and hydrogeology, two CBM accumulation models are put forward in the study area that include synclinehydraulic plugging below thrust nappe and faultconfined aquifer plugging. The volumetric method is used to estimate the CBM resources, and results indicate that the CBM resource in the whole coalfield is 428.78 × 108 m3, and the total resource abundance is 0.74 × 108 m3/km2. Two favorable areas for the CBM exploration are optimized based on the resource amount and resource abundance. One of the favorable areas is the Kabuqi area in the northern part of the coalfield, and another is the Baiyunwusu area in the central part of the coalfield. These two areas will be the CBM priority exploration areas at the western margin of the Ordos Basin.

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Geological Controls on the Gas Content and Permeability of Coal Reservoirs in the Daning Block, Southern Qinshui Basin

Cited by 11 publications

References 76 publications

Productivity characteristics and controlling factors of coalbed methane vertical well in a coal block of Qinshui Basin

Productivity characteristics and controlling factors of coalbed methane vertical well in a coal block of Qinshui Basin

Greenhouse Gasses Emission from Coal Mining Operation in North Kalimantan, Indonesia

Coalbed Methane Enrichment Characteristics and Exploration Target Selection in the Zhuozishan Coalfield of the Western Ordos Basin, China

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