Improvement of Water Saturation and Formation Factor Parameters in a Clastic Reservoir, Zagros Basin, SW Iran

Document Type : Research Paper

Authors

1 Shahid Chamran University, Ahvaz

2 PhD student of Shahid Chamran University, Ahvaz

Abstract

Water saturation (Sw) is one of the most important petro-physical parameter for evaluating the clastic horizons of hydrocarbon reservoir, which can be calculated using Archie's equation. The Archie's parameters (m, a) are the major source of uncertainty in the calculation of Sw. In order to obtain Archie's parameters, a total number of 117 sandstone samples, having resistivity measurements from Asmari Formation were studied. Due to scattered data points on the Log-Log plot of F versus Ø and to obtain reliable values for m and a parameters, the data were classified based on current zone indicator (CZI) into 6 classes of electrical flow unit (EFU). The values of parameters m and a obtained from F-Ø cross plots with excellent correlation coefficient. To avoid from data diversity and to make data applicable, the average values of m and a were obtained with considering the number of samples in each class. To assess the validation of the calculated F based on proposed values of m and a, the measured values of F versus calculated one's using Archie, Tixier and Humble formulas and proposed values were compared. The plot shows that the calculated F using Archie Tixier and Humble formulas are lower than calculated F using proposed and measured values. Applying the determined values seems to reasonably minimize the error in calculating F and therefore Sw%.
 

Keywords

References

[1] Xin, C. (2001). “Archie’s parameters determination with saturation analysis data.” International Symposium of the Society of Core Analysts (SCA)-46, 5p.
[2] Almalik, M.S., Hamada, G.M. and Al-Awad, M.N. (2001). “Accuracy analysis of Archie parameters and relevant effect on water saturation values.” International Symposium of the Society of Core Analysts (SCA)-39, 5p.
[3] Maute, R.E., Lyle, W.D. and Sprunt, E. (1992). “Improved data- analysis method determines Archie parameters from core data.” JPT, Jan., pp. 103-107.
[4] Yong, S. H. and Hong, Y. M. (1982). “Integrated interpretation and numerical processing of logging data.” Petroleum Industry Press, Beijing, pp. 24-33.
[5] Huang, L.G. and Brimhall, R.M. (1994). “Effect of rock wettability on log measurement.” (abstract only) Society of Professional Well Log Analysts, Beijing Chapter, 2nd International Well Logging Symposium Transactions, pp. 7-8.
[6] Ripe, L., Sharby, A. Ba.H., Hafiz, M., Rb. H., Nizam, M.Bm. Z. (2008). “An integrated petrophysical analysis to evaluate low resistivity low contrast (LRLC) pays in clastic reservoirs in SE Asia.” International Symposium of the Society of Core Analysts (SCA), Abu Dhabi, UAE 29Oct.-2 Nov., 6p.
[7] Hamada, G.M., Al-Majed, A.A., Okasha, T.M., and Al-Gathe, A.A. (2010). “Uncertainly analysis of Archie’s parameters determination techniques in carbonate reservoirs.” The 2nd Saudi Meeting on Oil and Natural Gas Exploration and Production Technologies (OGEP 2010), King Fahd Univ. Petrol. Mine. (KFUPM) Campus in Dhahran, Saudi Arabia, Dec. 18-20.
[8] Archie, G.E. (1942). “Electrical Resistivity Log as an Aid in Determining Some Reservoir Characteristics.” Trans., AIME, Vol. 146, pp. 54-62.
[9] Behin, R. (2004). “Investigation of the effect of stress on cementation factor of Iranian carbonate oil reservoir rocks.” International Symposium of the Society of Core Analysts (SCA), Abu Dhabi, UAE, Oct. 5-9, 7p.
[10] Winsauer, W.O., Shearin H.M., Masson, P.H., and Williams, M., 1952. “Resistivity of brine saturated sands in relation to pore geometry.” AAPG Bulletin, Vol. 36, No. 2, pp. 253-77.
[11] Avarjam, S., Mahboubi, A., Moussavi Harami, R., and Amiri-bakhtiar, H. (2014). “Provenance, Tectonic Setting and Geochemistry of Ahwaz Sandstone Member (Asmari Formation, Oligo-Miocene), Marun Oilfield, Zagros Basin, SW Iran.” acta Geologica Sinica, Vol. 88, No. 3, pp. 931–948.
[12] Amirshahkarami, M. (2013). “Microfacies correlation analysis of the Oligocene-Miocene Asmari Formation, in the central part of the Rag-e-Safid anticlinal oil field, Zagros Basin, south-west Iran.” Turkish Journal of Earth Sciences, Vol. 22, pp. 204-219.
[13] Lacassagne, R.M. (1963). “Asmari sedimentary environment of southwest Iran.” Iranian Oil Operating Companies, Geology and Exploration Division, Paleontology Department, 50 p. (unpub.).
[14] Seyrafian, A. (2000). “Microfacies and depositional environment of the Asmari Formation at Dehdez area (A correlation across Central Zagross Basin).” Carbonates and Evaporites, Vol. 15, pp. 22-48.
[15] Vaziri-Moghaddam, H., Kimiagari, M., Taheri, A. (2006). “Depositional environment and sequence stratigraphy of the Oligo-Miocene Asmari Formation in SW Iran.” Facies, Vol. 52, pp. 41-51.
[16] Zahedinezhad, J. (1987). “Geological study of Ahvaz sandstone member in southern part of Asmari sedimentary basin.” National Iranian Oil Company, Report No. 4028, 125 p. (unpub.).
[17] Buck, S.G. (1991). “Ahvaz Reservoir Characterization Study.” Schlumberger-National Iranian Oil Company (unpublished).
[18] Jafarzadeh, M. and Hosseini-Barzi, M. (2008). “Petrography and geochemistry of Ahvaz Sandstone Member of Asmari Formation, Zagros, Iran: implications on provenance and tectonic setting.” Revista Mexicana de Ciencias Geológicas, Vol. 25, No. 2, pp. 247-260.
[19] Adabi, M.H., Sadeghi, A.D., Hosseini, M., Moalemi, A., Lotfpour, A., Khatibi Mehr, M., Salehi, M., Zohdi, A., and Jafarzadeh, M. (2009). “Reservoir Characterization and tectonic settings of Ahvaz sandstone member of the Asmari Formation in the Zagros Mountain, SW of Iran.” EGU General Assembly, held 19-24 April, Vienna, p. 3645.
[20] Worthington, P.F., (2011). “The petrophysics of problematic reservoirs.” JPT, December, pp. 88-97.
[21] Prasad, J., and Tiwari, R.R. (2011). “Characterization of an unconventional complex clastic reservoir through log & core data to facilitate future exploration and development activities leading to production augmentation - A case study.” The 2nd South Asian Geoscience Conf. and Exhibition, Geoindia, New Delhi, 12-14 Jan., 6p.
[22] Hakimi, M.H., Shalaby, M.R., and Abdullah, W.H. (2012). “Application of well log analysis to assess the petrophysical parameters of the Lower Cretaceous Biyad Formation, East Shabowah Oilfields, Masila Basin, Yemen.” World Applied Sciences Journal, Vol. 16, No. 9, pp. 1227-1238.
[23] Shogenov, K., Shogenova, A., Vizika-Kavvadias, O., and Nauroy, J.F. (2015). “Reservoir quality and petrophysical properties of Cambrian sandstones and their changes during the experimental modelling of CO2 storage in the Baltic Basin, Estonian.” J. Earth Sci., Vol. 64, No. 3, pp. 199–217.
[24] Hamada, G.M., Algathe, A.A., Almajed, A.A., Okasha, T.M. (2013). “Uncertainty analysis of Archie’s parameters determination techniques in carbonate reservoirs.” J. Petrol. Explor. Prod. Technol., Vol. 3, pp. 1–10.
[25] Sweeney, S.A. and Jenning, H.Y (1960). “The electrical resistivity of preferentially water- wet and preferentially oil-wet carbonate rock.” Schlumberger Publ., Vol. 24, pp. 29-32.
[26] Ransom, R. C. (1984). “A contribution toward a better understanding of the modified Archie formation resistivity factor relationship.” The log analyst, No. 2, pp. 7-12.
[27] Hamada, G.M., Assal, A.M. and Ali, M.A. (1996). “Improved technique to determine Archie’s parameters and consequent impact on the exactness of hydrocarbon saturation values.” SCA # 9623 presented at Intl. Symposium of SCA, Sept. 8-10, Montpellier, France.
[28] Tucker, M.E. (1991). “Sedimentary petrology.” Black well scientific publications, 260p.
[29] Liu, H., Zhao, Y., Luo, Y., Chen, Z., and He, S. (2015). “Diagenetic facies controls on pore structure and rock electrical parameters in tight gas sandstone.” J. Geophy. Engin. Vol. 12, No. 4, pp. 587-600.
[30] Hossain, Z., and Cohen, A.J. (2012). “Relationship among porosity, permeability, elastic properties and electrical properties.” 82nd Annual International Meeting, SEG, Expanded Abstracts, doi: 10.1190/segam 2012-1496.1.
[31] Hossain, Z., and Zhou, Y. (2015). “Petrophysics and rock physics modeling of diagenetically altered sandstone.” Special section: Geol. Geophy. Petrophys. Interp.Core Data and Well Logs, February, 14P.
[32] Rezaee, M.R., Motiei H, and Kazemzadeh, E. (2007). “A new method to acquire m exponent and tortuosity factor for microscopically heterogeneous carbonates.” J. Petrol. Sci. Engin., Vol. 56, pp. 241-251.
Journal of Chemical and Petroleum Engineering
Volume 50, Issue 1
June 2016
Pages 1-8

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History

  • Receive Date: 03 July 2015
  • Revise Date: 28 June 2016
  • Accept Date: 31 January 2016

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