收稿日期: 2005-01-25
修回日期: 2005-02-17
网络出版日期: 2005-04-20
基金资助
四川省青年科技基金项目(编号:02ZQ026-042)资助.
THE STUDY OF GEOLOGY COURSE AND EXPERIMENT SIMULATION FORFORMING ULTRA-LOW WATER SATURATION IN TIGHTSANDSTONES GAS RESERVOIRS
Received date: 2005-01-25
Revised date: 2005-02-17
Online published: 2005-04-20
张浩,康毅力,陈一健,李前贵,高波 . 致密砂岩气藏超低含水饱和度形成地质过程及实验模拟研究[J]. 天然气地球科学, 2005 , 16(2) : 186 -189 . DOI: 10.11764/j.issn.1672-1926.2005.02.186
Recognizing the water saturation in tight gas reservoirs directly affects reserv es evaluation and development measurement of the gas reservoirs. Sealed coring a nd log interpretation show there is an ultra-low water saturation in tight gas reservoirs in northern Ordos basin, the initial water saturation in tight gas re servoirs is between 20% and 30%, which is far below the irreducible water satura tion. This article believe that the mechanism of forming ultra-low water satura tion in tight gas reservoirs is the result of the process of removing water duri ng hydrocarbon generating, then proving the conclusion by an experiment. The eff ects of isolation of mudstone, the variation of relative permeability between wa ter and gas in gas and water transitional zone, the continual gas accumulation i ncreasing the pressure in tight gas reservoirs are main issues for sustaining ul tra-low water saturation.
Key words: Ordos basin; Tight sandstones; Gas reservoirs; Water saturation.
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