Abstract
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.
Highlights
The Ordos Basin is China ’s second largest oil-bearing basin on land
Rich coal seams have been found in Hancheng, Daning, Jixian, Liulin, Wubao and other places on the eastern edge of the basin Gas resources [6,7,8], indicating that the eastern margin of the basin has huge potential for coalbed methane exploration and development
The Baode area is located on the eastern edge of the Ordos Basin and is rich in coalbed methane resources [9,10]
Summary
The western wing is steep and narrow, and the east wing is wide It is an asymmetric large-scale superimposed craton basin [1,2], which contains very rich coalbed methane resources [3,4,5]. Rich coal seams have been found in Hancheng, Daning, Jixian, Liulin, Wubao and other places on the eastern edge of the basin Gas resources [6,7,8], indicating that the eastern margin of the basin has huge potential for coalbed methane exploration and development. The Baode area is located on the eastern edge of the Ordos Basin and is rich in coalbed methane resources [9,10]. The formation approach and genetic mechanism provide guidance for subsequent exploration and development
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