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China has considerable coal resources. By benefiting from the widespread distribution of coal measures and the inter-sedimentary development of coal bed, dark shale and fine-grained tight sandstone in coal measures, China has good geological conditions and material basis for co-occurrence of a variety of coal gases. With such huge reservoir of coal gases, the co-occurrence of two or three gases of coal bed methane (CBM), shale gas, tight sandstone gas or natural gas hydrate is very common across the country. The per-well production of individual coal measure gas (e.g. CBM) is generally low when it is exploited separately, therefore it is essential to have more gas explored and produced in one well so as to raise per-well production, lower cost as well as increase economic benefit. Additionally, regarding gas control and treatment, the coal measure gas, including CBM and surrounding rock gas (a major source of CBM) should be preliminarily pumped, so as to significantly cut the coal mine gas accidents and effectively reduce greenhouse gas emission. Contributing to deeper research and further exploration, more and more coal measures holding multiple gases will definitely be explored and the proved resources of coal measure gas will be increased, indicating a prospect for co- exploration and joint exploitation of coal bed gas in China.

Resource Potential for Co-Exploration and Joint Exploitation on Unconventional Gas in Coal Measures in China