International Geologiical Congress - Oslo 2008


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GEP-17 Unconventional gas ? coalbed, shale, and tight gas-sands gases


Unconventional gas systems in China


Jinchuan Zhang, China University of Geosciences (China)
Bo Xu, China University of Geosciences (China)
Haikuan Nie, China University of Geosciences (China)
Xuan Tang, China University of Geosciences (China)


Nonbuoyancy and nonstructural mechanism are the dominant features of unconventional gas accumulations, for example the source-contacting gas or basin-centered gas, coal-bed methane, shale gas, water-dissolved gas, gas hydrate and so on. Together with conventional gas in normal traps, all the kinds of gas accumulations constitute the mechanic and distribution spectrums variously in clastic basins. As the main targets for unconventional gas exploration in China, source-contacting gas, coal-bed methane and shale gas have great resource portential and preferable development values. Source-contacting gas with saturated gas in the bottom of tight reservoirs, is one of the most favorable types for unconventional gas exploration in the Middle and Western basins, such as Ordos basin, Sichuan basin, Turpan-Hami basin, Tarim basin, Junggar basin etc. Coal-bed methane is the representative of absorption gas accumulation, which is significant for natutral gas exploration in medium and small sized basins such as qinshui basin, Chuxiong basin, Southern North basin etc, and the margins of big sized basins, for example the circumference of Bohai Bay basin. Shale gas with simultaneity free gas and absorption gas is existed universally in China, not only the basins in Northern Chian, for example Junggar basin, Turpan-Hami basin, ordos basin, Bohai Bay basin, Songliao basin, etc, but also the remnant sediment aeras with different denudation in Southern China, including Sichuan basin. Shale gas may be the important breakthrough for the hydrocarbon exploration in the near future for the Paleozoic sediment areas in Southern China where hydrocarbon resources are expected but little discoveries for a long time. Based on the sorrports by NSFC (40672087, 40472073, 40272062 and 40172052), 6 important big sized basins in China are studied systematicly. According to the gas spectrum analysis, four super systems for unconventional natutral gas in China canbe classified and established.


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