Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (4): 128-136.doi: 10.12108/yxyqc.20210414

• EXPLORATION TECHNOLOGY • Previous Articles     Next Articles

Identification of fluid properties of low contrast reservoir based on water-gas ratio calculation

ZHAO Jun1, HAN Dong1, HE Shenglin2, TANG Di2, ZHANG Tao1   

  1. 1. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
    2. Research Institute of Zhanjiang Company, CNOOC, Zhanjiang 524057, Guangdong, China
  • Received:2020-11-07 Revised:2021-01-28 Online:2021-08-01 Published:2021-08-06

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Abstract: The electrical properties of low contrast reservoir in Wenchang A sag in the Pearl River Mouth Basin have a complicated relationship with oil and gas properties. The logging response characteristics of gas and water layers are similar,so it is difficult to identify fluid properties only by conventional logging. In order to accurately identify the fluid properties of this type of gas reservoir,based on the phase permeability data,capillary pressure and other experimental data,the calculation model of the water-gas ratio was established through the phase permeability model under different water saturations and the diversion rate equation. Combined with production and test data,the identification standard of fluid with different water-gas ratio was established,and the reservoir fluid properties of Wenchang A sag were determined according to this standard. The results show that： （1）The calculated water-gas ratio is highly consistent with the actual production data,and the accuracy of the fluid interpretation results reaches 92%,which effectively improves the accuracy of fluid identification in low-contrast reservoirs.（2）The production test data plays a decisive role in the accuracy of the fluid property identification. This method is beneficial to the development of similar reservoirs.

Key words: low contrast, water-gas ratio, water saturation, fluid identification, logging response, Pearl River Mouth Basin

CLC Number: 

  • P618.13
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