Petroleum Exploration and Development >
Resource types, formation, distribution and prospects of coal-measure gas
Received date: 2019-01-16
Revised date: 2019-04-17
Online published: 2019-07-03
Supported by
Supported by the National Key Basic Research and Development Program, China.(973 Program)
Coal-measure gas is the natural gas generated by coal, carbonaceous shale, and dark shale in coal-measure strata. It includes resources of continuous-type coalbed methane (CBM), shale gas and tight gas reservoirs, and trap-type coal-bearing gas reservoirs. Huge in resources, it is an important gas source in the natural gas industry. The formation and distribution characteristics of coal-measure gas in San Juan, Surat, West Siberia and Ordos basins are introduced in this paper. By reviewing the progress of exploration and development of coal-measure gas around the world, the coal-measure gas is confirmed as an important strategic option for gas supply. This understanding is mainly manifested in three aspects. First, globally, the Eurasian east-west coal-accumulation belt and North American north-south coal-accumulation belt are two major coal-accumulation areas in the world, and the Late Carboniferous-Permian, Jurassic and end of Late Cretaceous-Neogene are 3 main coal-accumulation periods. Second, continuous-type and trap-type are two main accumulation modes of coal-measure gas; it is proposed that the area with gas generation intensity of greater than 10×10 8 m 3/km 2 is essential for the formation of large coal-measure gas field, and the CBM generated by medium- to high-rank coal is usually enriched in syncline, while CBM generated by low-rank coal is likely to accumulate when the source rock and caprock are in good configuration. Third, it is predicted that coal-measure gas around the world has huge remaining resources, coal-measure gas outside source is concentrated in Central Asia-Russia, the United States, Canada and other countries/regions, while CBM inside source is largely concentrated in 12 countries. The production of coal-measure gas in China is expected to exceed 1000×10 8 m 3 by 2030, including (500-550)×10 8 m 3 conventional coal-measure gas, (400-450)×10 8 m 3 coal-measure tight gas, and (150-200)×10 8 m 3 CBM.
Caineng ZOU , Zhi YANG , Shipeng HUANG , Feng MA , Qinping SUN , Fuheng LI , Songqi PAN , Wenguang TIAN . Resource types, formation, distribution and prospects of coal-measure gas[J]. Petroleum Exploration and Development, 2019 , 46(3) : 451 -462 . DOI: 10.1016/S1876-3804(19)60026-1
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