Research on the geochemical characteristics of coalbed methane and relationship between gas-logging and measured gas component in Guxu mine of southern Sichuan coalfield, China

2021 ◽  
Vol 14 (20) ◽  
Author(s):  
Xueyang Sun ◽  
Yiliang Hu ◽  
Dan Li
Keyword(s):  
Coalbed Methane ◽  
Geochemical Characteristics ◽  
Gas Component

scholarly journals Geochemical Characteristics and Productivity Response of Produced Water from Coalbed Methane Wells in the Yuwang Block, Eastern Yunnan, China

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Mingyang Du ◽  
Xiaojuan Yao ◽  
Shasha Zhang ◽  
He Zhou ◽  
Caifang Wu ◽  
...  
Keyword(s):  
Water Samples ◽  
Coalbed Methane ◽  
Produced Water ◽  
Dissolved Inorganic Carbon ◽  
Geochemical Characteristics ◽  
Water Type ◽  
Coal Seams ◽  
Rock Interaction ◽  
Cbm Production ◽  
Using Data

Coalbed methane (CBM) well-produced water contains abundant geochemical information that can guide productivity predictions of CBM wells. The geochemical characteristics and productivity responses of water produced from six CBM wells in the Yuwang block, eastern Yunnan, were analyzed using data of conventional ions, hydrogen and oxygen isotopes, and dissolved inorganic carbon (DIC). The results showed that the produced water type of well L-3 is mainly Na-HCO3, while those from the other five wells are Na-Cl-HCO3. The isotope characteristics of produced water are affected greatly by water-rock interaction. Combined with the enrichment mechanisms of isotopes D and 18O, we found that the water samples exhibit an obvious D drift trend relative to the local meteoric water line. The 13C enrichment of DIC in the water samples suggests that DIC is mainly produced by the dissolution of carbonate minerals in coal seams. The concentration of HCO3-, D drift trend, and enrichment of 13CDIC in produced water are positively correlated with CBM production, which can be verified by wells L-4 and L-6.

scholarly journals Geochemical characteristics of produced water from coalbed methane wells and its influence on productivity in Laochang Coalfield, China

2020 ◽  
Vol 12 (1) ◽  
pp. 1146-1157
Author(s):  
Mingyang Du ◽  
Caifang Wu ◽  
He Zhou ◽  
Shasha Zhang ◽  
Erchao Zhang
Keyword(s):  
Coalbed Methane ◽  
Produced Water ◽  
Geochemical Characteristics ◽  
Water Production ◽  
Coal Seams ◽  
Quantitative Characterization ◽  
Rock Interaction ◽  
Well Production ◽  
Water Rock Interaction ◽  
Production Characteristics

AbstractThe water produced from the coalbed methane (CBM) wells contains abundant geochemical information, which is of great significance in evaluating the productivity of these wells. Based on the data of water produced from five CBM wells, geochemical characteristics of the produced water and its influence on the productivity of the wells are analyzed in Laochang Block. The results show that with the increase in the produced water of the five wells, δD and δ18O show a downward trend in general, reflecting that the influence of coal seams and surrounding rock on the produced water is weak, while the water–rock interaction of the Y-3 and Y-5 wells is more stable than that of the Y-1, Y-2, and Y-4 wells. Combining the water production characteristics of the Y-3 and Y-5 wells with better drainage and recovery effects, it is proposed that 0 ≤ σM < 0.3 and 0 ≤ σY < 600 or 0.7 < σM < 0.8 and 1,200 < σY < 1,300, and the fluctuation ranges of Ca2+, Mg2+, HCO3− and SO42− can provide a basis for quantitative characterization and evaluation of CBM well production.

Evaluation of the Geochemical Characteristics and Exploitation Potential of Produced Water from Coalbed Methane Wells in Eastern Yunnan, China

2021 ◽  
Vol 21 (1) ◽  
pp. 591-598
Author(s):  
Mingyang Du ◽  
Caifang Wu ◽  
Shasha Zhang ◽  
Xiaolei Liu
Keyword(s):  
Coal Seam ◽  
Trace Element ◽  
Coalbed Methane ◽  
Element Concentration ◽  
Produced Water ◽  
Trace Element Concentration ◽  
Surrounding Rock ◽  
Geochemical Characteristics ◽  
Drainage Time

Based on the analysis of the geochemical characteristics of the produced water from coalbed methane wells in eastern Yunnan, the effects of the water-rock interactions on the produced water were discussed, and the mining potential of each of the four wells was evaluated. The results show that with the increase in drainage time, the Na+ and Cl− concentrations decrease while the HCO−3 concentration increases. The produced water from the two wells in the Enhong Block shows D drift characteristics, while that of the two wells in the Laochang Block shows O drift characteristics. The order of the produced water affected by the surrounding rock is D-1 well > M-1 well > D-2 well > M-2 well, and the order of the produced water influenced by the coal seam is D-1 well > D-2 well > M-1 well > M-2 well. According to the variation in the As trace element concentration, it is inferred that in the four coalbed methane wells, the D-1 and D-2 wells have a greater exploitation potential than that of the M-1 and M-2 wells. On this basis, the influencing characterization parameters of the water-rock interactions on the produced water are established.

scholarly journals Geochemical characteristics and genesis of coalbed methane in Baode area on the eastern margin of Ordos Basin

2020 ◽  
Vol 206 ◽  
pp. 01019
Author(s):  
Weiqiang Hu ◽  
Xin Chen ◽  
Yangbing Li ◽  
Litao Ma ◽  
Wang Yuesheng ◽  
...  
Keyword(s):  
Coal Seam ◽  
Coalbed Methane ◽  
Ordos Basin ◽  
Mean Value ◽  
Geochemical Characteristics ◽  
Coal Bed ◽  
Mass Reproduction ◽  
External Water ◽  
Systematic Understanding ◽  
Exploration And Development

The degree of coalbed methane exploration and development now in Baode area is relatively low. The lack of systematic understanding of the formation of coalbed methane in this area restricts the further exploration and development of coalbed methane. Based on the comprehensive study on the geochemical characteristics of coalbed methane components, hydrocarbon isotopes, water quality detection and hydrogen oxygen isotopes in coal seam in Baode area, the origin of coalbed methane in this area is discussed. According to the research, the hydrocarbon gas in the composition of coalbed methane in Baode area is mainly CH4 and a small amount of ethane. Both of their drying coefficients are more than 0.99, so they belong to the extremely dry coal bed methane. The value of δ13C(CH4) coalbed methane is on the low side and the value of δ13C(CO2) is on the high side, the mean value of δD(CH4) is -247.5‰, which shows the characteristics of terrestrial biogas. The water produced by coal seam is weak alkaline and belongs to the NaHCO3 type of water. which is similar to the surface water ion composition, salinity , δD(H2O) and δ18O(H2O) values, indicating that the hydrodynamic conditions of the coal seam in this area are more active. There is a recharge of external water, which is benificial to the mass reproduction of CH4 producing bacteria and the formation of biogas. In this area, the coalbed methane is a mixture of thermogenic and biological genesis, mainly composed of thermogenic gases and supplemented by biogenic gases generated through carbon dioxide reduction.

Geochemical Characteristics and Generation Process of Mixed Biogenic and Thermogenic Coalbed Methane in Luling Coalfield, China

2014 ◽  
Vol 28 (7) ◽  
pp. 4392-4401 ◽  
Author(s):  
Yuan Bao ◽  
Chongtao Wei ◽  
Chaoyong Wang ◽  
Guochang Wang ◽  
Qingguang Li
Keyword(s):  
Coalbed Methane ◽  
Geochemical Characteristics ◽  
Generation Process

Split Estate and Wyoming’s Orphaned Well Crisis: The Case of Coalbed Methane Reclamation in the Powder River Basin, Wyoming

2017 ◽  
Vol 1 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Kathryn Bills Walsh
Keyword(s):  
Natural Gas ◽  
River Basin ◽  
Technological Innovation ◽  
Coalbed Methane ◽  
Powder River Basin ◽  
Gas Wells ◽  
Mineral Rights ◽  
Split Estate ◽  
Legal Condition

This case presents the stakeholder conflicts that emerge during the development and subsequent reclamation of abandoned natural gas wells in Wyoming where split estate, or the separation of surface land and mineral rights from one another, occurs. From 1998 to 2008, the Powder River Basin of northeastern Wyoming experienced an energy boom as a result of technological innovation that enabled the extraction of coalbed methane (CBM). The boom resulted in over 16,000 wells being drilled in this 20,000 square-mile region in a single decade. As of May 2017, 4,149 natural gas wells now sit orphaned in Wyoming as a result of industry bankruptcy and abandonment. The current orphaned wells crisis was partially enabled by the patchwork of surface and mineral ownership in Wyoming that is a result of a legal condition referred to as split estate. As the CBM boom unfolded in this landscape and then began to wane, challenges emerged most notably surrounding stalled reclamation activities. This case illuminates these challenges highlighting two instances when split estate contributed to issues between landowners and industry operators which escalated to litigation.

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