Geological and engineering controls on the differential productivity of CBM wells in the Linfen block, southeastern Ordos Basin, China: Insights from geochemical analysis

Zhang, Yan; Tang, Dazhen; Li, Song; Liu, Jincheng; Lin, Weiren; Xu, Feng; Ye, Jincheng

doi:10.1016/j.petrol.2022.110159

Cited by 13 publications

(7 citation statements)

References 51 publications

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“…The salinity of coal seam water is one of the important parameters to characterize the degree of hydrodynamic activity. The high salinity indicates the stagnant water environment, which is favorable to the CBM enrichment, and serves as a fundamental geological feature for high CBM yield 27 , 28 . The salinity of the formation water within the research area is 10,344-81595 mg/L (avg.…”

Section: Hydrogeological Characteristicsmentioning

confidence: 99%

Evaluation of recoverable potential of deep coalbed methane in the Linxing Block, Eastern Margin of the Ordos Basin

Chen,

Li,

Tang

et al. 2024

Sci Rep

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The deep coalbed methane (CBM) resources are widely developed in the Linxing Block. However, the evaluation of CBM geological areas suitable for CBM exploitation remains unexplored, hindering further development. This research optimizes the key geological parameters that influence the development of deep CBM from the perspectives of resource and development conditions. The evaluation system for deep CBM recoverability has been established, and the multi-fuzzy evaluation method has been used to perform the quantitative evaluation of recoverability. The results indicate that the resource conditions of No.8 + 9 coal seam are superior to those of No.4 + 5 coal seam. Favorable resource conditions are predominantly concentrated in the northeast and specific southern portions of the research area. Favorable development conditions for both coal seams are mostly concentrated in the northeastern area. Based on the classification standard of recoverable favorable areas, the Level II area is crucial for the development of No.4 + 5 coal seam. This area is primarily distributed in the northeast of the research area., Both Level I and Level II areas for the No. 8 + 9 coal seam are situated in the northeast. The Level III area is earmarked for deep CBM production and shows potential for exploration. Further analysis reveals that the resource conditions in the favorable area are generally superior to the development conditions. These areas are classified as Class A, including categories such as I-A, II-A, and III-A, indicating relatively complex reservoir transformation.

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Section: Hydrogeological Characteristicsmentioning

confidence: 99%

Evaluation of recoverable potential of deep coalbed methane in the Linxing Block, Eastern Margin of the Ordos Basin

Chen,

Li,

Tang

et al. 2024

Sci Rep

Self Cite

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“…Previous researchers have extensively researched the main controlling factors of CBM wells productivity. The productivity of CBM wells is influenced by a variety of factors, which can be generally categorized as geological and engineering factors (Jin et al, 2022; Meng et al, 2020; Zhang et al, 2022). 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.…”

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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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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“…As the direct product of CBM drainage, the coal seam water carries rich hydrological geological information. The dynamic changes in various types of geochemical characteristics of gas and water have guidance significance for the gas production capacity of coal seams [13,14].…”

Section: Introductionmentioning

confidence: 99%

Geological and Geochemical Responses to Productivity of CBM Wells in the Baiyang River Block of the Southern Junggar Basin, China

Sun,

Tang,

Tao

et al. 2023

Energies

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The southern Junggar Basin, Xinjiang, has abundant coalbed methane (CBM) resources. Currently, the Baiyang River development pilot test area (BYR block for short) in the Fukang east block has achieved large-scale CBM development, but the productivity characteristics and its controlling factor are still unclear. Based on the field production data of the BYR block and experimental tests, this paper summarizes the gas and water production characteristics and presents the analysis results of the geological and geochemical responses to the productivity of CBM wells. The productivity of CBM wells in the BYR block was generally characterized as medium-to-low yield. The productivity was jointly controlled by the burial depth, structure condition, thickness and number of co-production coal seams, and hydrogeological conditions. The gas production first increased and then decreased with the increase in the burial depth of the coal seam, and a burial depth between 750 and 1000 m was the most beneficial to increasing the gas production due to the good gas preservation conditions and suitable permeability and stress conditions. The total thickness of the co-production coal seams had a positive effect on the productivity of gas wells, but the productivity was also affected by the number of co-production coal seams and interlayer interference. In the BYR block, the co-production of the nos. 41 and 42 coal seams was the most favorable combination form for CBM drainage. The productivity of CBM wells had a good response to the Na+, K+ and HCO3− concentrations but a poor response to δD-H2O and δ18O-H2O. Based on the concentrations of the main ions and TDSs of the coal seam water, a productivity response index δ* was established, and there was a good positive correlation between the productivity and δ*.

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Geological and engineering controls on the differential productivity of CBM wells in the Linfen block, southeastern Ordos Basin, China: Insights from geochemical analysis

Cited by 13 publications

References 51 publications

Evaluation of recoverable potential of deep coalbed methane in the Linxing Block, Eastern Margin of the Ordos Basin

Evaluation of recoverable potential of deep coalbed methane in the Linxing Block, Eastern Margin of the Ordos Basin

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

Geological and Geochemical Responses to Productivity of CBM Wells in the Baiyang River Block of the Southern Junggar Basin, China

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