Mechanism of Non-liner Gas Seepage Flow in Water-Bearing Volcanic Gas Reservoir
Received date: 2009-07-15
Revised date: 2009-12-24
Online published: 2010-06-10
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Volcanic gas reservoir has become one of the main fields of gas prospecting and development in China. Recently, the volcanic gas reservoir has exceeded 3,000 billion m3 in the basins of Songliao, Zhunger and Bohai bay. We discussed the gas seepage characteristic with different water saturations and the variation of movable gas saturation by means of physics simulation and nuclear magnetic resonance experiment. The result indicates that the relation curves between seepage discharge of volcanic gas reservoir rock and pressure gradient would be concave to line, and the Klinkenberg curve be divided into two seepage states by the critical water saturation. When the water saturation is lower than the critical water saturation, there is no gas start-up pressure gradient; and when the water saturation is higher than the critical water saturation, the start-up pressure gradient of gas exist. The higher the water saturation is, the bigger the start-up pressure gradient is, and the lower the movable gas saturation is. We also discuss the occurrence state of water in pores.
YANG Zheng-ming, HUO Ling-Jing, ZHANG Ya-pu, WANG Xue-Wu, SHAN Wen-wen . Mechanism of Non-liner Gas Seepage Flow in Water-Bearing Volcanic Gas Reservoir[J]. Natural Gas Geoscience, 2010 , 21(3) : 371 -374 . DOI: 10.11764/j.issn.1672-1926.2010.03.371
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