Quantitative Study on Pressure Evolution during Gas Charging to Reservoirs
详细信息
- 责任者：Liu Yifeng (State Key Laboratory of Petroleum Resources and Prospecting ; China University of Petroleum ; Beijing 102249 ; China) ; Yao Qianying
- 刊名：Geoscience
- 出版年：2013
- 卷期：27(5)
- 关键词：油气充注 ; oil and gas charging ; 超压 ; overpressure ; 储集层 ; reservoirs
- 页码：p.1211-1218
- 图表：6 illus., 1 table, 36 refs.
- 分类号：1003
- issnNo：ISSN1000-8527
- isbnNo：CN11-2035/P
摘要
Overpressure plays an important role in oil and gas exploration.Pressure transfer with gas charging is a dominant overpressure mechanism in reservoirs.Because of the tremendous difference in gas solubility and compressibility between formation water and oil,there are different pressure evolutions in the aquifer and the oil layer.In this paper pressure changes caused by methane filling in reservoirs with different kinds of initial pore fluid were simulated.And the quantitative relationship between volume of charged methane and overpressure was established.Then the influencing factors of pressure evolution during gas charging were analyzed.The results indicate the following aspects: gas charging could cause increase of pressure in reservoirs;pressure evolution paths are different with different initial pore fluids;strong overpressure is easier to form in aquifer than in oil-bearing formation;in the same sealing condition,it is easier to form overpressure in shallow strata than in deep strata as well as in high temperature basin than in low temperature basin.
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