Experiment Analysis of Relationship Between Property and Oil Injection Critical Pression of Low Porosity and Permeability Sandstone Within Chang-8 Member, Zhenjing Area of Ordos Basin

详细信息   

• 责任者：Liu Zhen (State Key Laboratory of Petroleum Resource and Prospecting in China University of Petroleum ; Beijing 102249 ; China) ; Wang Wei Pan
• 刊名：Chinese Journal of Geology
• 出版年：2012
• 卷期：47(2)
• 关键词：砂岩储集层 ; sandstone reservoirs ; 油气充注 ; oil and gas charging ; 鄂尔多斯盆地 ; Ordos Basin
• 页码：p.440-453
• 图表：illus., 23 refs.
• 分类号：1003
• issnNo：ISSN0563-5020
• isbnNo：CN11-1937/P

摘要

The formation of lithological reservoir is controlled by dominant petroleum migration pathways, fluid dynamic, reservoir property and sealing condition of lithological trap. It is proved that the more excessive porosity than critical porosity is not the deciding factor for hydrocarbon accumulation process in the exploration practise of lithological reservoir. The hydrocarbon injection into the trap is essentially dominated by the fluid dynamic in the accumulation period. In this paper,the oil injection experiment is used to mensurate the oil immission critical press on different confining pressure. On the base of the data, the relationship between the oil immission critical press and depth has been studied. Last the reservoir interpretation chart of low-permeability sandstone is established base on the relationship above. The oil injection experiment indicates the minimum injection porosity is 10.5%. The oil can not been injected into the sample when the property and permeability are lower than 10.5% no matter what press applied. The hydrocarbons charging critical press is controlled by the depth and property of the reservoir. If the porosity is the same, the injection critical press is more greater when the sandbody is imbeded more deeper. When the depth is the same,the press is negative correlation with the property of sandbody, expressing the trap of better property is more easier for oil accumulation. Applying the reservoir interpretation chart to the low-permeability lithological reservoir of study area, the oil charging press of oil wells are more greater than the hydrocarbons charging critical press., which of low producing oil well or water well is lightly greater or less than the critical charging press. Those results are all accord with the test of Chang-8 reservior, and the interpretation chart of low-permeability sandstone make a good effect in lithological reservoir exploration practice of Chang- 8 Member, Zhenjing area.