Irreducible Water Saturation Models of Tight Sandstone Gas Reservoirs with Low Porosity and Permeability and Its Application-Taking a Block of Shanxi Formation Tight Sandstone Reservoir in Sulige Gas Field as an Example
Received date: 2013-07-23
Revised date: 2013-07-30
Online published: 2014-02-10
Reservoirs in the study area have characteristics of low porosity,low permeability,low pressure,low abundance,and high water saturation. Irreducible water saturation is related to the pore structure,rock properties,and formation condition. So for different types of reservoirs,there have different factors influencing the irreducible water saturation,and the way to calculate are also different. According to the actual situation of the study area,we establish three models to calculate irreducible water saturation on the basis of NMR and well-logging data:porosity model which is very bad for low porosity,low permeability,and pore structure complex reservoirs;multiple linear regression analysis for pore structure index and shale content to get irreducible water saturation,which achieved good results;Pore structure index model which has high degree of agreement with NMR analysis and good effect. Therefore,according to the reservoir characteristics of the study area,the model established by pore structure index improves the accuracy of interpretation model,and provides a reliable basis for the post-logging interpretation.
CHEN Ke-gui，WEN Yi-na，HE Tai-hong，SUN Wan-ming，WANG Chao，WU Tao，FU Jian-guo . Irreducible Water Saturation Models of Tight Sandstone Gas Reservoirs with Low Porosity and Permeability and Its Application-Taking a Block of Shanxi Formation Tight Sandstone Reservoir in Sulige Gas Field as an Example[J]. Natural Gas Geoscience, 2014 , 25(2) : 273 -277 . DOI: 10.11764/j.issn.1672-1926.2014.02.273
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