Abstract
Division of coalbed methane (CBM)-enriched units primarily depends on the analysis of the main controlling factors of CBM occurrence. The main controlling factors analyzed in this article are sedimentary sequences related to the forming and alteration of CBM, tectonic movement, and burial and hydrocarbon-generation histories. The parameters were measured for independent quantities such as CBM content, gradient, coefficient of extraction difficulty and geological structure complexity. Correlation analysis was conducted between the measured parameters of CBM-bearing systems and the main controlling factors. When the controlling factors are sedimentary sequences and the sedimentary systems tract, the division of CBM-enriched units is based on the coal-forming environment, coal mass distribution and coal characteristics. When the controlling factor is the tectonic matching between the orefield, mining area and mining wells, the division of CBM-enriched units is based on tectonic movement. When burial and hydrocarbon-generation histories are the controlling factors, the division of CBM-enriched units is based on metamorphic traits.
Highlights
Coalbed methane (CBM) development can convert waste into resources, help optimize the energy structure and reduce environmental pollution
The geological conditions of CBM in China are very complex, and the coal-bearing basins each have special features in some aspects. This leads to differences in the main controlling factors that are considered for the division of CBM-enriched units
The history of CBM was tracked from formation to alteration, and the main controlling factors for the heterogeneity of CBM-enriched units were analyzed based on sedimentary sequences, tectonic movement and burial and hydrocarbon-generation histories
Summary
Coalbed methane (CBM) development can convert waste into resources, help optimize the energy structure and reduce environmental pollution. Many studies [2,3,4,5,6,7] have been devoted to the division of CBMenriched units, including those based on big data thinking [1], multiple superposed CBM-bearing systems [5,6] and stepwise tectonic control [6,7,8]. Division of CBM-enriched units has evoked widespread attention, and many theoretical investigations have been conducted, such as those based on big data thinking, multiple superposed CBM-bearing systems and stepwise tectonic control, as mentioned above. The division of CBM-enriched units should be primarily based on the sedimentary sequences of the forming and alteration of CBM, considering tectonic movement in addition to burial and hydrocarbon-generation histories
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