Document Type : Original Research Paper

Authors

1 School of Geology, University College of Science, Tehran University

2 Department of Geology, Ferdowsi University of Mashhad.

3 Iranian National Oil Company,Falat Ghare Company.

Abstract

      Investigation and detail recognition of hydrocarbon reservoirs can have a good help in management of production wells, and field development. Burgan formation is deltaic sandstone from lower-median Cretaceous that is divided into three zones, A, B, and C. This formation in its type section (Kuwait) makes the second biggest world reservoir, with up to 72 billion barrels   of in situ oil. In this study, evaluation of reservoir parameters has been made for this formation. Volume of shale, porosity, permeability, saturation, determination of oil water contact (OWC), net/gross and hydrocarbon column thickness, are the main reservoir parameters, that have been calculated with deterministic and problistic method using different logs and core data of 36 wells.
All of these parameters in problistic method have been calculated by professional petrophysic software, Geolog. Results of calculations show that despite of B zone lower thickness; this zone has a very high reservoir quality than the other two zones. This high quality arises from clean sand and high porosity (intergranualr) and permeability of this zone. Higher thickness of Burgan formation and its reservoir zones in the west of study field, and reservoir high quality in these horizons, show that the original source of clastic sediments is form the Arabian Shield toward Iran.

Keywords

References
 
Archie, G. E., 1942- The electrical resistivity log as an aid in determining some   reservoir characteristics, Transactions of AIME, v. 146, p. 54-62.
Clavoud, J-B. & Lavigne,J., 2003- Anisotropy of Resistivity in oil bearing thin – bedded formation, experiment and modeling, International symposium of the core analysts,pau France,21-24 Septemper,2003,p,127-132.
Evans,R., Mory A.J & Tait, A.M., 2006- an outcrop gamma ray study of the Tumblagooda sandstone, Western Australia, Journal of Petroleum Science and Engineering, 24–31.
Fe´lixa, Luis Carlos Molina, Belanche Mun.T, Lluı´s, A., 2004 - Representing a relation between porosity and permeability based on inductive rules, Journal of Petroleum Science and Engineering, 23–34.
Frost, E. & Fertl, W. H., 1981- Integrated core and log analysis concepts in shaly clastic reservoir, Journal of Petroleum Science and Engineering, 37–58.
Granier, B., 2004- a new approach in rock-typing, documented by a case study of layer-cake reservoirs in field "A", offshore Abu Dhabi (U.A.E.), Journal of Petroleum Science and Engineering, 201–208.
Guo,Boyun,Ghalambor,Ali Duan,Shengkai, 2004- Correlation between sandstone permeability and capillary pressure curves, Journal of Petroleum Science and Engineering, 239–246.
Hurst, A. & Nadeau, P. H., 1995- Clay microporosity in reservoir sanstone: An application of quantitative electron microscopy in petrophysical evaluation, journal of petroleum science and engineering, p. 37-48.
Kamel, M. & Mabrouk, W., 2003- Estimation of shale volume using a combination of the three porosity logs, journal of petroleum science and engineering, v. 40, p. 145-157.
Kamel, M. H., Mabrouk, W. M. I., Bayo, A., 2001- Porosity estimation using a combination of Wyllie-Clemenceau equations in clean sand formation from acoustic logs, Journal of Petroleum Science and Engineering, 241–251.
Kamel, M. H., Mohamed M. Mohamed, 2006- Effective porosity determination in clean/shaly formations from acoustic logs with applications, Journal of Petroleum Science and Engineering, 267–274.
Machhour, L., Prinet, C. & Mresah, M., 2003- Primary Facies and Diagenetic Controls on the Evolution of Petrophysical Attributes and Rock Type Distribution:Example of West Mabruk Oil Field (Libya),AAPG International Conference, Barcelona, Spain ,September 21-24, 2003.
Poupon, A. & Leveaux, J. A., 1971- evaluation of water saturations in shaly formations. Trans. SPWLA 12th Ann. Logging symp. O1-2 (Full text in shaly sand reprint volume, SPWLA, Houston, pp IV 81-95).
Rider, M. H., 1986- the geological interpretation of well logs, Hatsted press, A Division of john wiley and sons, Newyork, pp.175.
Schlumberger, 1989, Log interpretation principles / Application, Eighth printing Feb.   1999.
Serra, O. A., 1984- Fundamentals of well log interpretation: The Aquisition of logging data, Elsevier publications, 423 pp.
Tiab, D. & Donaldson, E. C., 1996- Petrophysics: Theory and practice of measurly reservoir rock and fluid transport properties, Gulf Publishing Company Houston Texas, pp.889.
Zhang Jian-hua, Jian Oyang, Qi Hu, Chun-zeng Lin, 1997- A method to evaluate reservoirs and estimate saturation by dynamic responses of dual-induction logging tools, Journal of Petroleum Science and Engineering, 233–240.