Fan Z.-Q.,No. 2 Gas Production Plant of PertroChina Changqing Oilfield Company |
Yang G.-P.,No. 2 Gas Production Plant of PertroChina Changqing Oilfield Company |
Ding X.,No. 2 Gas Production Plant of PertroChina Changqing Oilfield Company |
Yang L.,Chengdu University of Technology |
And 4 more authors.
Natural Gas Geoscience | Year: 2015
The distribution of gas and water is complex for tight sandstone gas reservoir in Shan 2 reservoir of Zizhou Gasfield. There is general water breakthrough during development in some regions. As a typical lithologic gas reservoir, this is dominated by structure, sand body characteristics, reservoir physical property and hydrocarbon accumulations. Therefore, given all sorts of factors, the fluid recognition method and effectiveness was researched. Based on the conventional cross-plot method of natural gamma-resistivity, natural gamma distinguished gas, water and dry layers clearly, and resistivity distinguished gas and water layers effectively. The conventional cross-plot method, the cross-plot of resistivity-porosity, P1/2 cumulative frequency method and multiple discriminating methods are applied to identify the gas, water and dry layers. The result shows that these methods can effectively distinguish reservoir fluid. Among them, the identification effect of the natural gamma-resistivity and multiple discriminating methods are better, and the model can be used for fluid identification in the study and adjacent areas. The practical application approved that these methods used together to identify the gas, water and dry layers in the study area must be effective. Compared with gas testing results, the discriminating rates have reached 95.8%, which confirmed that this method has good accuracy. The above methods have a good effect on the gas and water interpretation, which can be widely used in similar adjacent reservoirs. ©, 2015, Science Press. All right reserved.