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Study on a New Method for Calculating Water Saturation

Received: 20 October 2019     Accepted: 15 November 2019     Published: 25 November 2019
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Abstract

In order to improve the identification and evaluation accuracy of low resistivity oil layer and complex pore structure oil layer, and to avoid the interpretation error caused by the traditional evaluation mode of “high resistivity is oil layer and low resistivity is water layer”, the method of calculating water saturation by radial resistivity ratio was studied. The results show that the radial resistivity ratio can be used to calculate the reservoir water saturation for completely invaded formation, which can be deduced according to archie formula. The new formula does not evaluate oil and water layers based on high or low of resistivity, but can be used to evaluate low resistivity oil and high resistivity water layers. After testing core experimental data, The new formula can effectively calculate the water saturation and meet the requirement of using. After practical application of data, The average absolute error of the calculated water saturation is 3.55%, which conforms to the industry standard. This method is helpful to improve the coincidence rate of logging interpretation, and is worth popularizing.

Published in International Journal of Oil, Gas and Coal Engineering (Volume 7, Issue 6)
DOI 10.11648/j.ogce.20190706.13
Page(s) 125-129
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2019. Published by Science Publishing Group

Keywords

Radial Resistivity Ratio, Reservoir Oil Bearing, Archie's Formula, Rock-electric Experiment, Sw Calculation, Oil and Water Layer Evaluation

References
[1] Archie, G. E. The electrical resistivity log as an aid in determining some reservoir characteristics [J]. Tnas Am Inst MechEng, 1942, 146: 54-61.
[2] Pickett, G. R. A review of current techniques for determination of water saturation from Logs [J]. Journal of Petroleum Technology, 1966, 18 (11): 1425-1433.
[3] Clavier, C., Coates, G., Dumanoir, J. Theoretical and experimental bases for the dual-water model for interpretation of shaly sands [J]. Society of Petroleum Engineers Journal, 1984. 24 (2): 153-168.
[4] Zhang, C. G., Mao, Z. Q., Ou, Y. J. The New technique for evaluating water saturation of the "low resistivity" reservoir In J Field [C]. SPWLA 35th Annual Logging Symposium, 1994, 19-22, June, Tulsa, Oklahoma.
[5] Hamada, G. M., Alawad, M. Petrophysical Evaluation of Low Resistivity Sandstone Reservoirs [J]. Journal of Canadian Petroleum Technology, 2000, 39 (7).
[6] Koelman, J. M., Fanini, O. N., Kreigshauser, B. F. Enhanced evaluation of low-resistivity reservoirs using multi-component induction log data [J]. Society of Petrophysicists and Well-Log Analysts, 2001, 42 (6).
[7] Wen Tang. One Well Evaluation in Low Permeability Gas Sandstones from Nuclear Magnetic Resonance (NMR) logs [C]. SPE Middle East Unconventional Gas Conference and Exhibition, 2011, 31 January-2 February, Muscat, Oman.
[8] Zakir Hossain. A relationship between rock physics and nuclear magnetic resonance [C]. SEG International Exposition and Annual Meeting, 2016, 16-21 October, Dallas, Texas.
[9] Verga, F., Giaccardo, A., Gonfalini, M. Determination of uncertainties in water saturation calculations from well log data using a probabilistic approach [C]. Offshore Mediterranean Conference and Exhibition, 2001, 28-30 March, Ravenna, Italy.
[10] Leandro, H. M., Alexandre, C. V., Ivan, M. F., et al. The impact of Archie´s parameters in the calculation of water saturation for carbonate reservoir, Campos Basin, Brazil [C]. SEG Annual Meeting, 2015, 18-23 October, New Orleans, Louisiana.
[11] Sarihi, A., Vargas-Murillo, B. A method to compute water saturation in tight rocks accounting for conductivity of clay minerals [C]. Abu Dhabi International Petroleum Exhibition and Conference, 2015, 9-12 November, Abu Dhabi, UAE.
[12] Yu Hongyan, Wei Xiaolong, Wang Zhenliang, et al. Review of water saturation calculation methods in shale gas reservoir [C]. SPE Asia Pacific Oil and Gas Conference and Exhibition, 2018, 23-25 October, Brisbane, Australia.
[13] Deng Shaogui, Sun Qingtao, Li Hu, et al. The sensitivity of the array resistivity log to mud filtrate invasion and its primary five-parameter inversion for improved oil water recognition [J]. Petroleum Science, 2012, 9 (6): 295-302.
[14] Yang Kebing, Yuan Xiaohong, Liu Mingbo, et al. Resistivity ratio method to evaluate oil-water layer [J]. Natural Gas Exploration & Development, 2015, 38 (1): 37-39.
[15] Yang Kebing, Li Shidong, Wang Huijing, et al. Discussion on the method of evaluating oil and water layers by using ratio of deep resistivity and flush zone resistivity [J]. International Journal of Oil, Gas and Coal Engineering, 2019, 7 (1): 7-12.
Cite This Article
  • APA Style

    Yang Kebing, Xie Li, Zhang Lei, Li Jun, Cao Chengcheng. (2019). Study on a New Method for Calculating Water Saturation. International Journal of Oil, Gas and Coal Engineering, 7(6), 125-129. https://doi.org/10.11648/j.ogce.20190706.13

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    ACS Style

    Yang Kebing; Xie Li; Zhang Lei; Li Jun; Cao Chengcheng. Study on a New Method for Calculating Water Saturation. Int. J. Oil Gas Coal Eng. 2019, 7(6), 125-129. doi: 10.11648/j.ogce.20190706.13

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    AMA Style

    Yang Kebing, Xie Li, Zhang Lei, Li Jun, Cao Chengcheng. Study on a New Method for Calculating Water Saturation. Int J Oil Gas Coal Eng. 2019;7(6):125-129. doi: 10.11648/j.ogce.20190706.13

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  • @article{10.11648/j.ogce.20190706.13,
      author = {Yang Kebing and Xie Li and Zhang Lei and Li Jun and Cao Chengcheng},
      title = {Study on a New Method for Calculating Water Saturation},
      journal = {International Journal of Oil, Gas and Coal Engineering},
      volume = {7},
      number = {6},
      pages = {125-129},
      doi = {10.11648/j.ogce.20190706.13},
      url = {https://doi.org/10.11648/j.ogce.20190706.13},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ogce.20190706.13},
      abstract = {In order to improve the identification and evaluation accuracy of low resistivity oil layer and complex pore structure oil layer, and to avoid the interpretation error caused by the traditional evaluation mode of “high resistivity is oil layer and low resistivity is water layer”, the method of calculating water saturation by radial resistivity ratio was studied. The results show that the radial resistivity ratio can be used to calculate the reservoir water saturation for completely invaded formation, which can be deduced according to archie formula. The new formula does not evaluate oil and water layers based on high or low of resistivity, but can be used to evaluate low resistivity oil and high resistivity water layers. After testing core experimental data, The new formula can effectively calculate the water saturation and meet the requirement of using. After practical application of data, The average absolute error of the calculated water saturation is 3.55%, which conforms to the industry standard. This method is helpful to improve the coincidence rate of logging interpretation, and is worth popularizing.},
     year = {2019}
    }
    

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  • TY  - JOUR
    T1  - Study on a New Method for Calculating Water Saturation
    AU  - Yang Kebing
    AU  - Xie Li
    AU  - Zhang Lei
    AU  - Li Jun
    AU  - Cao Chengcheng
    Y1  - 2019/11/25
    PY  - 2019
    N1  - https://doi.org/10.11648/j.ogce.20190706.13
    DO  - 10.11648/j.ogce.20190706.13
    T2  - International Journal of Oil, Gas and Coal Engineering
    JF  - International Journal of Oil, Gas and Coal Engineering
    JO  - International Journal of Oil, Gas and Coal Engineering
    SP  - 125
    EP  - 129
    PB  - Science Publishing Group
    SN  - 2376-7677
    UR  - https://doi.org/10.11648/j.ogce.20190706.13
    AB  - In order to improve the identification and evaluation accuracy of low resistivity oil layer and complex pore structure oil layer, and to avoid the interpretation error caused by the traditional evaluation mode of “high resistivity is oil layer and low resistivity is water layer”, the method of calculating water saturation by radial resistivity ratio was studied. The results show that the radial resistivity ratio can be used to calculate the reservoir water saturation for completely invaded formation, which can be deduced according to archie formula. The new formula does not evaluate oil and water layers based on high or low of resistivity, but can be used to evaluate low resistivity oil and high resistivity water layers. After testing core experimental data, The new formula can effectively calculate the water saturation and meet the requirement of using. After practical application of data, The average absolute error of the calculated water saturation is 3.55%, which conforms to the industry standard. This method is helpful to improve the coincidence rate of logging interpretation, and is worth popularizing.
    VL  - 7
    IS  - 6
    ER  - 

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Author Information
  • Petro China Huabei Oilfield Company, Renqiu, China

  • Petro China Huabei Oilfield Company, Renqiu, China

  • Petro China Huabei Oilfield Company, Renqiu, China

  • Petro China Huabei Oilfield Company, Renqiu, China

  • Petro China Huabei Oilfield Company, Renqiu, China

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