scholarly journals Current status and key factors for coalbed methane development with multibranched horizontal wells in the southern Qinshui basin of China

2019 ◽  
Vol 7 (5) ◽  
pp. 1572-1587 ◽  
Author(s):  
Shida Chen ◽  
Dazhen Tang ◽  
Shu Tao ◽  
Yanhui Yang ◽  
Longwei Chen
Keyword(s):  
Coalbed Methane ◽  
Horizontal Wells ◽  
Current Status ◽  
Key Factors ◽  
Qinshui Basin ◽  
Southern Qinshui Basin

Log evaluation of a coalbed methane (CBM) reservoir: a case study in the southern Qinshui basin, China

2014 ◽  
Vol 11 (1) ◽  
Author(s):  
Hou Jie ◽  
Zou Changchun ◽  
Huang Zhaohui ◽  
Xiao Liang ◽  
Yang Yuqing ◽  
...  
Keyword(s):  
Coalbed Methane ◽  
Qinshui Basin ◽  
Southern Qinshui Basin

scholarly journals Biogeochemistry and the associated redox signature of co-produced water from coalbed methane wells in the Shizhuangnan block in the southern Qinshui Basin, China

2020 ◽  
Vol 38 (4) ◽  
pp. 1034-1053
Author(s):  
Yang Li ◽  
Shuheng Tang ◽  
Songhang Zhang ◽  
Zhaodong Xi ◽  
Pengfei Wang
Keyword(s):  
Coalbed Methane ◽  
Produced Water ◽  
Dissolved Inorganic Carbon ◽  
Gas Production ◽  
Redox Conditions ◽  
Effective Parameters ◽  
Production Rates ◽  
Qinshui Basin ◽  
Southern Qinshui Basin ◽  
Biogeochemical Parameters

To meet the global energy demands, the exploitation of coalbed methane has received increasing attention. Biogeochemical parameters of co-produced water from coalbed methane wells were performed in the No. 3 coal seam in the Shizhuangnan block of the southern Qinshui Basin (China). These biogeochemical parameters were firstly utilized to assess coal reservoir environments and corresponding coalbed methane production. A high level of Na+ and HCO3– and deuterium drift were found to be accompanied by high gas production rates, but these parameters are unreliable to some extent. Dissolved inorganic carbon (DIC) isotopes δ13CDIC from water can be used to distinguish the environmental redox conditions. Positive δ13CDIC values within a reasonable range suggest reductive conditions suitable for methanogen metabolism and were accompanied by high gas production rates. SO42–, NO3– and related isotopes affected by various bacteria corresponding to various redox conditions are considered effective parameters to identify redox states and gas production rates. Importantly, the combination of δ13CDIC and SO42– can be used to evaluate gas production rates and predict potentially beneficial areas. The wells with moderate δ13CDIC and negligible SO42– represent appropriate reductive conditions, as observed in most high and intermediate production wells. Furthermore, the wells with highest δ13CDIC and negligible SO42– exhibit low production rates, as the most reductive environments were too strict to extend pressure drop funnels.

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