Case Study of Petrophysical Evaluation Utilizing Well Logs Data with Optimization of Reservoir Cut-off Parameters

Authors

  • Walid Mohamed Mahmud University of Tripoli, Tripoli, Libya
  • Ziad Bennour Curtin University Malaysia, CDT250, Miri 98000, Sarawak, Malaysia

DOI:

https://doi.org/10.15377/2409-787X.2020.07.5

Keywords:

Well log analysis, cut-offs in integrated reservoir studies, petrophysical properties, experimental measurements, mature fields, shaly sands

Abstract

Petrophysical evaluation of well log data is essential for the exploration and evaluation of hydrocarbon-bearing formations. Moreover, there are no standard criteria to implement cut-offs on petrophysical properties as a direction for economic decisions. In the present work, a petrophysical evaluation of well logging data from four wells in a mature oil field is performed to identify formation quality as a potential for hosting mature hydrocarbons reservoirs. Full consideration of cut-off values was taken into account. The cut-offs were estimated from well-recognized petrophysical relationships for permeability as a function of porosity, water saturation, and shale content. Results verification and calibration were also made based on laboratory measurements of petrophysical properties obtained from available core plugs in order to minimize uncertainty. Lithology analysis and characteristics revealed that the target formation is mainly sand and shale sequences. Results from well logs were in agreement with results obtained from core data. Formation effective porosity varies from 16 to 26% in all wells. A wide range of variations is observed in water saturation ranging from 28 to 57% and permeability ranging from 20 to 3300 mD. This is in good agreement with other measurements and well log analysis that show the mature formation remains to be a good hydrocarbon reservoir with significant potential.

Author Biographies

Walid Mohamed Mahmud, University of Tripoli, Tripoli, Libya

Department of Petroleum Engineering, Faculty of Engineering

Ziad Bennour, Curtin University Malaysia, CDT250, Miri 98000, Sarawak, Malaysia

Petroleum Engineering Department

References

Ellis D., Singer J. Well Logging for Earth Scientists (2ed.). Springer Netherlands. 2007. https://doi.org/10.1007/978-1-4020-4602-5

Neog PK, Borah NM. Reservoir characterization through well test analysis assists in reservoir simulation - a case study. SPE Asia Pacific oil and gas conference and exhibition, 2000; 16–18 October, Brisbane, Australia. https://doi.org/10.2118/64447-MS

Joshi GK, Shyammohan V, Reddy AS, Singh B, Chandra M. Reservoir characterization through log property mapping in Geleki field of upper Assam, India. The 5th Conference and exposition on petroleum geophysics, Hyderabad, India. 2004; pp. 685-687.

Ishwar NB, Bhardwaj A. Petrophysical well log analysis for hydrocarbon exploration in parts of Assam-Arakan basin, India. In: 10th Biennial international conference and exposition, society of exploration geophysicists, Kochi, India. 2013; pp. 153.

Ben Mahmud HK, Muhammad Hilmi BMH, Mahmud WM, Van HL, Mian USh Petrophysical interpretations of subsurface stratigraphic correlations, Baram Delta, Sarawak, Malaysia, Energy Geoscience.2020; Volume 1, Issues 3–4, Pages 100-114. https://doi.org/10.1016/j.engeos.2020.04.005

Rider M. The geological interpretation of well log (2ed.). Whittles Publishing, London. 1996; ISBN-13: 978-0954190606.

Mukerji T, Avseth P, Mavko G, Takahashi I, González EF. Statistical rock physics: combining rock physics, information theory, and geo-statistics to reduce uncertainty in seismic reservoir characterization. Lead Edge. 2001; 20(3), pp. 313– 319. https://doi.org/10.1190/1.1438938

Sarasty JJ, Stewart RR (2003) Analysis of well-log data from the White Rose oilfield, offshore Newfoundland. CREWES Res Rep 15, pp. 1–16.

Sabila, T., Mahmud, H. K. B., Mahmud, W. M., & Van Dijke, M. I. J.. Two-Phase Oil-Water Empirical Correlation Models for SCAL and Petrophysical Properties in Intermediate Wet Sandstone Reservoirs. IOP Conference Series: Materials Science and Engineering. 2019; 495(1), [012065]. https://doi.org/10.1088/1757-899X/495/1/012065

Mahmud, WM, Ermila, M, Aljahmi, R, Nasr-eddin E. Comparison Between SCAL Measurements and Pore-Scale Network Models for Neutrally Wet Sandstone on Two-Phase Oil-Water Empirical Correlations and Petrophysical Properties."" Paper presented at the International Petroleum Technology Conference, Dhahran, Kingdom of Saudi Arabia, January 2020. https://doi.org/10.2523/IPTC-19979-Abstract

Chang HC, Kopaska-Merkel DC, Chen HC. Identification of lithofacies using Kohonen self-organizing maps. Computer Geosciences. 2002; 28, pp. 223-229. https://doi.org/10.1016/S0098-3004(01)00067-X

Khalifa, MK, Jones, BG, Mahmud, WM. Lithostratigraphic and sequence stratigraphic architecture of the Winduck Interval, central Darling Basin, Australia, based on integration of wireline logs, cores and cuttings data. Int J Earth Sci (Geol Rundsch). 2016; 105, 1109–1126 https://doi.org/10.1007/s00531-015-1241-8

Khalifa, MK, Mahmud, WM, Alta’ee, AF et al. Sequence stratigraphic analysis of fluvial deposits using facies characterization and wireline log correlation: case of the late Early-early Middle Devonian Snake Cave Interval, Darling Basin, Australia. Arab J Geosci. 2015; 8, 9733–9752. https://doi.org/10.1007/s12517-015-1872-x

Aigbedion JA, Iyayi SE. Formation Evaluation of Oshioka Field, using geophysical well logs Middle-east Journal of Scientific Research 2. 2007; pp. 107-110.

Asquith G, Krygowski D (2004) Relationships of Well Log Interpretation in Basic Well Log Analysis Method in Exploration Series: American Association of Petroleum Geologists, 16, pp. 140. https://doi.org/10.1306/Mth16823C1

SeyedBijan M, Hadi S, Mehdi N, Yaser M. Optimization of reservoir cut-off parameters: a case study in SW Iran. Petroleum Geoscience. 2011; 17, pp. 355-363. https://doi.org/10.1144/1354-079311-005

Thomas SA. The Sirte Basin Province of Libya Sirte-Zelten Total Petroleum System. The US Geological Survey Bulletin. 2001; 2202–F. http://geology.cr.usgs.gov/pub/bulletins/ b2202-f/

Anketell JM, Salem MJ, El-Hawat AS, Sbeta AM. Structural history of the Sirt basin and its relationships to the Sabratah basin and Cyrenaican platform, northern Libya. Geology of the Sirte Basin. Elsevier. 1996; 3, pp. 57-88.

Baird DW, Aburawi RM, Bailey NJL. Geohistory and petroleum in the central Sirte Basin. Geology of the Sirte Basin: Elsevier. 1996; 3, pp. 3-56.

Rusk DC. Libya: Petroleum potential of the underexplored basin centers - A twenty-first-century challenge. AAPG Memoir. 2001; 74, pp. 429-452.

Carmalt, SW, Bill St. John. Giant oil and gas fields, in Future Petroleum Provinces of the World: AAPG Memoir. 1986; 40, p. 11-53

Brennan, P. Raguba field-Libya, Sirte Basin, in American Associ ation of Petroleum Geologists Treatise of Petroleum Geology, Atlas of Oil and Gas Fields, Structural Traps VII. 1992; p. 267–289.

Montgomery S. Sirte Basin, North-Central Libya, prospects for the future: Petroleum Frontiers. Petroleum Information Corporation. 1994; 11, pp. 1-94.

MacGregor DS, Moody RTJ. Mesozoic and Cenozoic petroleum systems of North Africa. Petroleum geology of North Africa: Geological Society, Special Publication. 1998; 132, pp. 201–216. https://doi.org/10.1144/GSL.SP.1998.132.01.12

Worthington, PF, Cosentino, L. The Role of Cut-offs in Integrated Reservoir Studies. Paper No: 84387 presented at SPE Annual Technical Conference and Exhibition, Denver, 2003; 5-8 October. https://doi.org/10.2118/84387-MS

Dressor A. Well Logging and Interpretation Techniques: The Course for Home Study Orklahoma (Second Edition). 2004; pp. 692.

Allaud LA, Martin MH. Schlumberger: The history of well log technique. John Wiley & Sons, Inc., New York City. 1977; pp. 333.

Simandoux, P. Dielectric measurements in porous media and application to shaly formation: Revue de L’Institut Français du Pétrole. 1963; v. 18, Supplementary Issue, p. 193–215.

Schlumberger. A guide to wellsite interpretation of the Gulf Coast, Houston, Schlumberger Well Services, Inc. 1975.

Bambang W. An improvised method for determining reservoir rock porosity cut-off with support of laboratory mercury injection data. Paper 143273 presented at SPE Asia Pacific Oil and Gas Conference and Exhibition. 2001; 20-22 September, Jakarta, Indonesia

Mahmud, WM. Effect of Network Topology on Relative Permeability; Network Model and Experimental Approaches. International Journal of Oil, Gas and Coal Engineering. 2017; Vol. 5, No. 5, pp. 90-96. https://doi.org/10.11648/j.ogce.20170505.14

Aldukalia i, BenAbdulhafid Z, Marghani MM. Petrophysical Evaluation of the upper Beda member using Well Logging Analysis in (Balat Field, NC-59, southwest Sirt Basin, Libya). International Science and Technology Journal. 2020; Volume 23. pp 2-18.

Downloads

Published

2020-12-31

How to Cite

1.
Walid Mohamed Mahmud, Ziad Bennour. Case Study of Petrophysical Evaluation Utilizing Well Logs Data with Optimization of Reservoir Cut-off Parameters. Int. J. Petrol. Technol. [Internet]. 2020Dec.31 [cited 2021Sep.25];7(1):45-59. Available from: https://www.avantipublishers.com/jms/index.php/ijpt/article/view/960

Issue

Section

Articles