Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (6): 84-90.doi: 10.3969/j.issn.1673-8926.2017.06.011

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Formation mechanism and log evaluation methods of marine low resistivity reservoir in Oriente Basin

YANG Ruixiang1,2, WANG Xianggong1,2, BAI Songtao3, WAN Jinbin3, CAI Chengding3   

  1. 1. Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, Yangtze University, Wuhan 430100, China;
    2. College of Geophysics and Petroleum Resources, Yangtze University, Wuhan 430100, China;
    3. CNPC Logging Co., Ltd., Xi'an 710077, China
  • Received:2017-03-05 Revised:2017-07-16 Online:2017-11-21 Published:2017-11-21

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Abstract: It is difficult to calculate the bound water saturation and water saturation directly by using Archie method in the low contrast of oil and water layers in marine reservoirs. In order to solve the problem,based on geologic factors,core and logging data,combined with logging response characteristics of low resistivity reservoir,the formation mechanism of marine low resistivity reservoir was studied,and the fine evaluation model of reservoir saturation was established by analyzing the main controlling factors. The results show that the bound fluid and additional conductivity characteristics of glauconite are the main cause of the formation of low resistivity reservoir. The low resistivity reservoir saturation calculated by bound water saturation calculation model based on the main controlling factors and the corrected water saturation calculation model based on conductive factor are consistent with bound water saturation analyzed by core mercury injection experiment. Applied to marine low resistivity reservoir evaluation in Oriente Basin,the corrected water saturation calculation model based on conductivity factor improved the coincidence rate of interpretation and reservoir parameter interpretation accuracy,and achieved good application effect, verifying its effectiveness.

Key words: tight sandstone, shale, reservoir characteristics, main controlling factors, the fifth member of Xujiahe Formation, Western Sichuan Depression

CLC Number: 

  • TE122
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