SUMMARY

Study on coal and water characteristics and coal-to-gas conversion efficiency of
indigenous microbials to apply MECoM technology in Sông Hồng coal basin

Hoàng Lan, Phùng Thị Thủy, Phạm Thị Mai Phương, Nguyễn Đức Dũng, Tô Kim Anh,

Nguyễn Lan Hương, Đồng Văn Giáp, Hoàng Văn Long, Phan Đức Lễ, Lê Quốc Hùng

For a preliminary assessment of the microbial enhancing coal-bed methane approach in the Sông Hồng coal basin (MECoM); 05 coal samples (C2.1 to C2.5), and 01 FW water sample from the same well were analyzed for structural and physicochemical properties. The coal samples all belong to the high volatile sub-bituminous. A coal with a dominant vitrinite maceral. For C2.1 to C2.4 coal samples, the pore volume is dominated by macropores, which account for 76.5 to 83.2%, respectively. The SEM images showed that the coal pores were mainly plant tissue holes and blowpores. When the sample reaches a depth of 853.8 m, the C2.5 coal sample shows a different trend; the blowhole mesopores sharply increased with a maximum surface area of 3,886 m2/g. The water sample was the sodium- chloride type. The maximum production of biogenic methane (4.96 ml CH4/g coal) was observed in the C2.4 coal sample. And in the C2.5 coal sample, a steep decrease in CH4 production (1.15 ml CH4/g coal) was recorded. In comparison with the same condition coal basins, the results of this study suggest that the MECoM technology is feasible in the Sông Hồng Basin.

Keywors: Sông Hồng coal basin, maceral component, pore structure, coal-to-gas conversion efficiency, microbials.