Category Features of Water-soluble Gas and Main Controlling Factors for Its Accumulation
Received date: 2008-08-20
Revised date: 2008-11-03
Online published: 2008-12-10
Water soluble gas is an important natural gas resource. Its occurrence can be classified as two categories: free phase and water-dissolving phase. The water-soluble gas has higher methane content and dry coefficient than the conventional gas, and has some non-hydrocarbon gases such as CO2 and N 2.The methane isotope of water-dissolving phase is lower than its gas source, and its exsolved gas also has lower methane isotope than water-dissolving phase gas. The solubility of water-soluble gas is controlled by temperature, pressure and water salinity. Abundant gas source and enough local water are the basis for water-soluble gas accumulating, and abnormal formation pressure and tectonic uplift are its significant conditions. The Xujiahe formation of central Sichuan basin has the features of big gas generation intensity, high water saturation, high formation pressure, and big intensity of tectonic uplift during the late period. Therefore, it has very abundant water-soluble gas resource.
ZHANG Zhan-guo ;BIAN Cong-sheng . Category Features of Water-soluble Gas and Main Controlling Factors for Its Accumulation[J]. Natural Gas Geoscience, 2008 , 19(06) : 876 -881 . DOI: 10.11764/j.issn.1672-1926.2008.06.876
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