Geocatalytically generated methane from low-maturity coal and shale source rocks at low temperatures (80–120 ◦C) over 52 months

Submitted data was used to write an article: Liu, B., Schimmelmann, A., Mastalerz, M., Drobniak, A., Ma, X., Geocatalytically generated methane from low-maturity coal and shale source rocks at low temperatures (80−120 °C) over 52 months. International Journal of Coal Geology, 272, 104250. https://doi.org/10.1016/j.coal.2023.104250  

Funding acknowledgments: This study is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Chemical Sciences, Geosciences, and Biosciences Division under Award Number DE-SC0006978. B. Liu and X. Ma received financial support from theNational Natural Science Foundation of China (Nos. 42202167 and 41872141). A. Drobniak received funding from the Polish National Agency for Academic Exchange within the Polish Returns Programme (BPN/PPO/2021/1/00005/DEC/1) and the National Science Center, Poland (2022/01/1/ST10/00024).

Article Abstract: Geocatalytic methanogenesis has been proposed to contribute to methane generation from low-maturity coal and shale source rocks. This study contributes further evidence for geocatalytic methanogenesis from low-maturity source rocks based on long-term experiments lasting up to 52 months. Samples from the Upper Devonian New Albany Shale (Ro 0.54 %) and Springfield Coal No. 2 (Pennsylvanian; Ro 0.54 %) were heated in glass tubes at 80, 100, and 120 ◦C for 52 months. Sample aliquots from the Upper Cretaceous Second White Specks Formation (Ro 0.42 %) were heated in gold tubes at 80 and 100 ◦C for 42 months at elevated hydrostatic pressures of 100 to 300 MPa. The product gases — methane (CH4) and carbon dioxide (CO2) — were collected and quantified, and gas yields were corrected for leakage from imperfectly closed pores in samples during heating. The results show that longer heating produced more CH4. The average CH4 yields from New Albany Shale and Springfield Coal No. 2 are 0.47 and 3.0 μmol CH4 per gram of total organic carbon (TOC) over 52 months of heating. Elevated hydrostatic pressure caused lower CH4 yields from the Second White Specks Formation (3.82 to 1.20 μmol g-1 TOC), suggesting that pressure can retard methanogenesis. Maceral type critically controls the methanogenesis potential of low-maturity coal and shale source rocks. Results of this study provide important insights to the origin of natural gas in low-maturity sedimentary basins.