Bulletin Article


The influence of moisture, temperature, coal rank, and differential enthalpy on the methane (CH4) and carbon dioxide (CO2) sorption capacity of coals of different rank has been investigated by using high-pressure sorption isotherms at 303, 318, and 333 K (CH4) and 318, 333, and 348 K (CO2), respectively. The variation of sorption capacity was studied as a function of burial depth of coal seams using the corresponding Langmuir parameters in combination with a geothermal gradient of 0.03 K/m and a normal hydrostatic pressure gradient. Taking the gas content corresponding to 100% gas saturation at maximum burial depth as a reference value, the theoretical CH4 saturation after the uplift of the coal seam was computed as a function of depth. According to these calculations, the change in sorption capacity caused by changing pressure, temperature conditions during uplift will lead consistently to high saturation values. Therefore, the commonly observed undersaturation of coal seams is most likely related to dismigration (losses into adjacent formations and atmosphere). Finally, we attempt to identify sweet spots for CO2-enhanced coalbed methane (CO2-ECBM) production. The CO2-ECBM is expected to become less effective with increasing depth because the CO2-to-CH4 sorption capacity ratio decreases with increasing temperature and pressure. Furthermore, CO2-ECBM efficiency will decrease with increasing maturity because of the highest sorption capacity ratio and affinity difference between CO2 and CH4 for low mature coals.

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Explorer Article


What’s next? Leaders of three AAPG Regions talk about anticipated activity and potential challenges their areas face in 2011. 

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Europe needs a remedy: Years of worry about reliable gas supply from Russia has Europe looking north for gas exploration. Algeria may be just what the doctor ordered.

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Explorer Division Column EMD


Over the past year or so we have observed strong evidence that nuclear power is into a new expansion period.

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Explorer Emphasis


Construction continues for the new GE Global Research’s Oil & Gas Technology Center in Oklahoma City – part of the company’s three-year effort to triple R&D investment in the oil and gas industry. The $125 million facility “will be an incubator for new innovative technologies that will enable safe, efficient and reliable exploration, production, delivery and use of unconventional oil and gas.”

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When it comes to geothermal energy, Germany is feeling the heat – literally and figuratively – beneath its feet.

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European researchers, inspired by gas shale successes in the United States, have started a database in hopes of finding similar success for their continent.

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Explorer Regions and Sections

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