Evaluation of the Mishrif Formation Using an Advanced Method of Interpretation
DOI:
https://doi.org/10.31699/IJCPE.2023.2.5Keywords:
Formation evaluation, Water saturation, Porosity, Permeability, Quanti-Elan Solver and Well logging analysisAbstract
The Mishrif Formation is one of the most important geological formations in Iraq consisting of limestone, marl, and shale layers since it is one of the main oil producing reservoirs in the country, which contain a significant portion of Iraq's oil reserves. The formation has been extensively explored and developed by the Iraqi government and international oil companies, with many oil fields being developed within it. The accurate evaluation of the Mishrif formation is key to the successful exploitation of this field. However, its geological complexity poses significant challenges for oil production, requiring advanced techniques to accurately evaluate its petrophysical properties.
This study used advanced well-logging analysis techniques, including mineralogical inversion with the Quanti-Elan model employed in Schlumberger's Techlog software to evaluate this formation. The lithology, clay volume, porosity, permeability, and hydrocarbon saturation data were obtained from the open hole logging of three wells in a southern Iraqi oil field. The environmental correction was applied for open-hole logging tools, and the primary mineral of the formation was determined using porosity log cross-plotting. Pickett plot technique was utilized to determine water resistivity and Archie's parameters, and the reconstruction log was generated based on volumetric and response parameters for each component. Based on thorough analysis, the clay volume of the Mishrif formation is estimated to be about 10%, which is a common value for this rock type. The porosity was computed based on the total fluid volume, ranging from 11% to 14%, and water saturation was determined using Archie's equation. The final results of the volume of each component for rock and fluid are presented using computer programming interpretation. The results of this study provide valuable insights into the petrophysical properties of the Mishrif formation and are expected to inform for better interpretation and evaluation of petrophysical properties of similar formations, which is essential for optimum field development planning as well as minimising the uncertainties.
Received on 29/08/2022
Received in Revised Form on 27/09/2022
Accepted on 02/10/2022
Published on 30/06/2023
References
H. Liu et al., “Pore types, origins and control on reservoir heterogeneity of carbonate rocks in Middle Cretaceous Mishrif Formation of the West Qurna oilfield, Iraq,” J Pet Sci Eng, vol. 171, pp. 1338–1349, 2018. https://doi.org/10.1016/j.petrol.2018.08.034
L. Zhang et al., “Identification, distribution characteristics, and effects on production of interlayers in carbonate reservoirs: A case study from the Cretaceous Mishrif Formation in Halfaya Oilfield, Iraq,” J Pet Sci Eng, vol. 202, p. 108571, 2021. https://doi.org/10.1016/j.petrol.2021.108571
Y. Zhong et al., “Characteristics of depositional environment and evolution of Upper Cretaceous Mishrif Formation, Halfaya Oil field, Iraq based on sedimentary microfacies analysis,” Journal of African Earth Sciences, vol. 140, pp. 151–168, 2018. https://doi.org/10.1016/j.jafrearsci.2018.01.007
X. Fang and H. Feng, “Study on discriminant method of rock type for porous carbonate reservoirs based on Bayesian theory,” Sci Rep, vol. 11, no. 1, p. 18622, 2021. https://doi.org/10.1038/s41598-021-99325-6
F. N. Sadooni, “The nature and origin of Upper Cretaceous basin-margin rudist buildups of the Mesopotamian Basin, southern Iraq, with consideration of possible hydrocarbon stratigraphic entrapment,” Cretac Res, vol. 26, no. 2, pp. 213–224, 2005. https://doi.org/10.1016/j.cretres.2004.11.016
O. Salman, O. Al-Fatlawi, and S. Al-Jawad, “Reservoir Characterization and Rock Typing of Carbonate Reservoir in the Southeast of Iraq,” The Iraqi Geological Journal, pp. 221–237, 2023. https://doi.org/10.46717/igj.56.1A.17ms-2023-1-29
H. H. Mahmood and O. F. Al-Fatlawi, “Construction of Comprehensive Geological Model for an Iraqi Oil Reservoir,” The Iraqi Geological Journal, pp. 22–35, 2021. https://doi.org/10.46717/igj.54.2F.3ms-2021-12-20
O. Al-Fatlawi, A. R. Vimal Roy, M. M. Hossain, and A. H. Kabir, “Optimization of infill drilling in Whicher range field in Australia,” in SPE Kingdom of Saudi Arabia Annual Technical Symposium and Exhibition, OnePetro, 2017. https://doi.org/10.2118/188085-MS
G. B. Asquith, D. Krygowski, and C. R. Gibson, Basic well log analysis, vol. 16. American Association of Petroleum Geologists Tulsa, 2004.
F. S. Kadhim and H. Al-Sudani, “Petrophysical Properties of Khasib Formation in East Baghdad Oil Field Southern Area,” Iraqi Journal of Chemical and Petroleum Engineering, vol. 21, no. 4, pp. 41–48, 2020. https://doi.org/10.31699/IJCPE.2020.4.5
S. Staff, “Log Interpretation Principles/Applications.” SMP-7017, Schlumberger Wireline and Testing, Sugar Land, Texas, 1989.
M. Watfa, “Carbonate Interpretation.” Schlumberger, 1987.
T. K. Al-Ameri, A. J. Al-Khafaji, and J. Zumberge, “Petroleum system analysis of the Mishrif reservoir in the Ratawi, Zubair, North and South Rumaila oil fields, southern Iraq,” GeoArabia, vol. 14, no. 4, pp. 91–108, 2009. https://doi.org/10.2113/geoarabia140491
C. géologique international. C. de stratigraphie, R. C. van Bellen, H. v Dunnington, R. Wetzel, and D. M. Morton, Lexique Stratigraphique International: Asie. Iraq. Tertiary. Mesozoic and Palaeozoic. Centre National de la Recherche Scientifique, 1959.
S. Z. Jassim and J. C. Goff, “Geology of Iraq,” Dolin,Prague and Moravian Museum, Brno, Czech Republic, vol. 5, 2006.
H. Q. Hameed and A. H. Saleh, “Petrophysical Evaluation of Mauddud Formation in Selected Wells from Ratawi Oil Field, Southern Iraq,” Iraqi Journal of Science, pp. 2956–2969, 2021. https://doi.org/10.24996/ijs.2021.62.9.12
Al-Mohsen.M, “Facies architecture, clay minerals and its effect on petrophysical properties of Mishrif formation in west Qurna oil field Southern Iraq,” Baghdad University, 2019.
C. Schlumberger, Techlog Fundamentals-Workflow and Solution Training. 2013.
W. Lyons, Working guide to reservoir engineering. Gulf professional publishing, 2009.
M. Al-Hilali, “Using Modified Coriband Technique to Evaluate Carbonate Reservoirs in East Baghdad Oil Field.,” Baghdad University, 2006.
M. M. Herron, “Estimating the intrinsic permeability of clastic sediments from geochemical data,” in SPWLA 28th Annual Logging Symposium, OnePetro, 1987.
A. M. Al-Heeti and O. F. Al-Fatlawi, “Review of Historical Studies for Water Saturation Determination Techniques,” The Iraqi Geological Journal, pp. 42–62, 2022. https://doi.org/10.46717/igj.55.2A.4Ms-2022-07-20
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