1. Through in situ studies on the Tempoku Coalfield, data on biomethane production, such as the effect of injecting hydrogen solution peroxide in the lignite on the microbial community, will be acquired and analyzed to find issues in the practical use of SCG method.

2. Examination of crack formation and fluid movement characteristics in the stratum.

Experimental studies were conducted on the formation of cracks in the stratum by hydraulic fracturing, fluid movement in the stratum, and the effects of injection of hydrogen peroxide was monitored. Based on these results, an improved and optimized SCG method will be formulated.

3. Formulation of design, construction, and control methods for improvement of SCG method.

After a comprehensive analysis of experimental results, such as in-situ studies on crack formation improved design, construction, and control method for the practical use of SCG, will be formulated. The design guidelines for the practical application of the SCG method, such as the relationship between the carbon endowment state, geological conditions, as well as the methane recovery amount and cost will be presented.