Developing a Saturation Height Function (SHF) for the classified Hydraulic Flow Unit, a case study from the Middle Miocene Carbonate reservoir in the Song Hong Basin, Vietnam

  • Affiliations:

    1 Petrovietnam Exploration Production Corporation, Hanoi, Vietnam
    2 Schlumberger Vietnam, Hochiminh, Vietnam
    3 Hanoi University of Mining and Geology, Hanoi, Vietnam

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  • Received: 20th-July-2023
  • Revised: 26th-Oct-2023
  • Accepted: 21st-Nov-2023
  • Online: 1st-Dec-2023
Pages: 1 - 10
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Abstract:

The Middle Miocene carbonate is the main gas bearing reservoir in the southern part of the Song Hong basin. Carbonate reservoirs present challenges for engineers and geologists to characterize because of their complexity due to depositional and diagenetic processes. The log based calculated water saturation Sw for this complex carbonate reservoir bears a lot of uncertainties due to its heterogeneity that strongly affects to m and n values in the water saturation equation. As the calculated Sw strongly affects the Hydrocarbon Initially In Place (HIIP) estimation, the production performance prediction, etc., the alternative method using the Saturation Height Function (SHF) based on the capillary pressure was introduced. The SHF building process uses the combination of the result of HFU classification and permeability prediction given by machine learning methods, which have become a very useful tool for complex reservoir characterization such as carbonate reservoir for decades. Our obtained results allowed us to subdivide the carbonate reservoir into 5 Hydraulic Flow Unit (HFU) by using unsupervised machine learning methods, and then the capillary pressure (Pc) curves were classified and a proper saturation-height function using Skelt Harrison equation was assigned to individual HFU after testing with common SHF equations. The HFU number for each individual point was predicted based on the log data measured along the borehole using the supervised machine learning techniques while the Sw was calculated using the chosen SHF model and the FWL defined on log curves and pressure data from RCI measurement. The Sw computed from the SHF model is reliable and can be used for water saturation estimation for the whole field for known FWL and predicted HFU numbers.

How to Cite
Nguyen, D.Trung, Ha, M.Quang, Nguyen, V.Hong, Phan, H.Thien, Hoang, C.Minh and Truong, H.Khac 2023. Developing a Saturation Height Function (SHF) for the classified Hydraulic Flow Unit, a case study from the Middle Miocene Carbonate reservoir in the Song Hong Basin, Vietnam. Journal of Mining and Earth Sciences. 64, 6 (Dec, 2023), 1-10. DOI:https://doi.org/10.46326/JMES.2023.64(6).01.
References

Amaefule, J.O., Altunbay, M., Tiab, D., Kersey, D.G., and Keelan, D.K. (1993). Enhanced Reservoir Description: Using Core and Log Data to Identify Hydraulic (Flow) Units and Predict Permeability in Uncored Intervals/Wells. In Proceedings of the SPE Annual Technical Conference and Exhibition, Houston, TX, USA, 3-6 October 1993; p. SPE-26436-MS.

Amin, A. T., Watfa, M., and Awad, M. A. (1987). Accurate estimation of water saturations in complex carbonate reservoirs. In SPE Middle East Oil and Gas Show and Conference (pp. SPE-15714). SPE.

Ebanks, W. J. (1987). Flow unit concept-integrated approach to reservoir description for engineering projects. AAPG (Am. Assoc. Pet. Geol.) Bull.;(United States), 71(CONF-870606).

Hamada, G. M., and Al-Awad, M. N. (2001). Evaluating uncertainty in archie's water saturation equation parameters determination methods. In SPE Middle East Oil and Gas Show and Conference (pp. SPE-68083). SPE.

Harrison, B., and Jing, X. D. (2001). Saturation height methods and their impact on volumetric hydrocarbon in place estimates. In SPE Annual Technical Conference and Exhibition (pp. SPE-71326). SPE.

Zahaf, K., Bourdarot, G., and Low, S. (2014). Water saturation in transition zone in carbonate reservoirs: Reconciling open hole log and capillary pressure. In Abu Dhabi International Petroleum Exhibition and Conference (p. D041S070R006). SPE.

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