A new insight into coalbed methane occurrence and accumulation in the Qinshui Basin, China

Evaluation of Favorable Area for Coalbed Methane Development Based on Local Variable Weight Theory

“…Coalbed methane (CBM) is an efficient, clean, and high-quality unconventional natural gas source. , The development of CBM could not only improve the security of coal mine production but also optimize the structure of energy consumption and is more conducive to the reduction of carbon emission which could promote the achievement of carbon peaking and carbon neutrality. , The CBM resource within a burial depth of less than 2000 m in China accounts for 30.05 × 10 12 m 3 , while 18.47 × 10 12 m 3 in the depth of 2000–3000 m. − After the exploration and development of CBM in recent decades, two industrial bases of CBM were gradually formed in China (i.e., the southern part of Qingshui Basin and the eastern margin of Ordos Basin). − By the end of 2023, more than 20,000 CBM wells had been completed in China, and CBM production reached 117.7 × 10 8 m 3 per year. The rapid development of the CBM industry requires the support of advanced theory and technology. , …”

Controlled reconstruction and application research of lateral overlying strata structure in high-gas mines with thick-hard roofs for a fully-mechanized top-caving face

“…The Jincheng coal mining area in southern Shanxi Province, China, is known for its abundant coal and gas reserves and ranks first among the six major mining areas in the Qinshui Coalfield. The mines in this region are characterized by a deep burial depth, thick roof strata, and high gas emissions [ [1] , [2] , [3] ]. With increasing mining depths and intensifying mining activities coupled with complex and variable coal seam occurrences in certain areas, significant challenges have arisen during mining operations, such as severe strata behavior, substantial roadway deformation, and excessive corner gas concentration.…”

Geological Control Mechanism of Coalbed Methane Gas Component Evolution Characteristics in the Daning-Jixian Area, Ordos Basin, China

“…6−9 The pore-fracture network structure in coal seams not only serves as a storage space for CBM, but also as a seepage channel for fluids in coal seams. 10 In the pore-fracture structure, the adsorption capacity of each gas component is different, 11 and numerous studies show that CO 2 adsorption is greater than CH 4 adsorption, 12 and the purpose of driving out CH 4 and increasing the recovery rate of CBM is achieved by utilizing the competitive adsorption of CO 2 and CH 4 . It is of great significance to investigate the desorption−diffusion−transport process of CBM in the regional geological context by studying the gas components of CBM.…”

“…Coal bed methane (CBM) is an unconventional natural gas stored in coal seams, which can be divided into two groups: “productive gases” (CH 4 , C 2 , C 3 , etc.) and “inert gases” (CO 2 , N 2 , and H 2 S). , The carbon in CBM mainly comes from coal reservoirs, and the carbon isotopes of CBM and the concentrations of various gas components contain rich genesis information, , and the distribution of methane carbon isotopes (δ 13 C 1 ) and the concentrations of various gas components can reflect the fractionation phenomenon that occurs due to desorption and diffusion during the transportation of CBM in porous medium coal seams . The uneven distribution of CBM in space-time is controlled by multiple factors such as tectonic morphology and hydrogeology, with tectonic morphology controlling CBM storage and escape and groundwater in coal reservoirs influencing CBM preservation and transportation. − …”