Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (1): 312-319.doi: 10.13278/j.cnki.jjuese.201501305

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Evaluation Method of Saturation in Low Resistivity Reservoir in the Pearl River Estuary Basin

Wu Jian, Hu Xiangyang, Liang Yunan, Tang Di, Zheng Xiangwei   

  1. Zhanjiang Branch of CNOOC Ltd, Zhanjiang 524057, Guangdong, China
  • Received:2014-03-08 Published:2015-01-26

Abstract:

The low resistivity reservoir in Pearl River Estuary basin has the characteristic of high shale content, low resistivity, as well as low capacity. It is so difficult to calculate the ture saturation of low resistivity reservoir. Firstly, the authors analyze the geologic origin of low resistivity formation, and give the main reason is the developed conductive network to high bound water content. Using several saturation models which is suit for argillaceous sandstone to calculate the saturation, and the sealing core drilling data, we show the methods of Leakage correction, degassing correction, compaction correction, volumetric factor correction at different formation conditions. And then we calibrate the logging interpretation saturation with NMR logging data. The results show that the water saturation of the low resistivity reservoir is above 70% in average, and saturation form Indonesia formula fits well to the core saturation which has been corrected and the NMR bound water saturation, so the Indonesia formula is the best saturation model for the low resistivity reservoir in this region.

Key words: low resistivity reservoir, saturation model, shale content, leakage correction, bound water saturation

CLC Number: 

  • P631.8

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