Effects Deliberation of Fractures and Determination of in-situ Stress in Asmari Reservoir Formation in Marun Oilfield (Based on Image Logs Interpretation Results)

Authors

1 Structural and reservoir geologist at National Iranian South Oil Company(NISOC)

2 PHD student, Department of geology, School Sience, University of Birjand, Birjand, Iran

Abstract

Abstract:
Zagros Fold-Trust belt with 2000 km length and it’s hydrocarbon reservoirs is the richest fold-trust belt in the world. Marun Oilfield is one of the biggest reservoir in south-west of Iran and north-east of Ahwaz city also in north Dezful embayment. Asmari Formation is the most important reservoir in Marun oilfield. Nowadays, knowledge about state, magnitude and in-situ stress direction in different studies of Oil and gas reservoir like geology, drilling and petroleum engineering is cleared. Study of in-situ stress in hydrocarbon reservoirs is divided to some part like state of stress, magnitude and the direction of stress tensors from each other. One of the advantages of stress study in hydrocarbon reservoir is usage these results in reservoir geomechanics that could solves some problems like wellbore instability during drilling, choosing safe trajectory, casing failure, different methods of reservoir stimulation, have an important role. This research was paid to review and determination of in-situ stress direction in Asmari reservoir formation in Marun Oilfield. For Analysis of in-situ stress direction, the result of image logs is the best way to use and so 19 wells became candidate. Also on this research, because of the importance on most of reservoir geomechanics applications, minimum horizontal stress direction was in focus. Finally, because of structural complexity and stress concentration in the ends of Marun structure, it determined that in-situ stress direction was changed but in other places has the strike of NW-SE. If both the north and north-east and centre fractures are associated with folding and bending seen, based on maps along fracture zones located on the southern limb of the layer at wells No. 181, 341, 322 and 278 in the eastern cape of along the dominant fracture orientation E130N, except those marked the longitudinal tensile fractures.
 

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References

مراجع:
- ستودنیا، ا .،پری، تی جی .، 1966، شرکت ملی نفت ایران نقشه100000/1 مارون .
- فارسی‌مدان، م.، 1390، بررسی اثر خزش سنگ در ایجاد مچالگی لوله‌های جداری در میدان نفتی مارون، پایان‌نامه کارشناسی ارشد زمین‌شناسی مهندسی، دانشگاه آزاد اسلامی واحد علوم و تحقیقات تهران، 188 صفحه.
- میرزا قلی پور، ع.، حقی، ع.، 1369، مطالعه زمین‌شناسی میدان نفتی مارون، اداره کل زمین‌شناسی گسترشی، شرکت ملی مناطق نفتخیز جنوب، گزارش شماره پ-4210، 55 صفحه.
- Agard, P., Omradi, J., Jolivet, L., Whitechurch, H., Vrielynck, B., Spakman, W.,Monie, P., Meyer, B and Wortel, R., 2011. Zagros orogeny: a subduction-dominated process, Geology Magazine 1-34.
- Brudy, M. and Zoback, M.D; 1993. Compressive and tensile failure of bore-holes arbitrarily inclined to principal stress axis: application to the KTB boreholes.34th US Symposium on Rock Mechanics Germany.
- Berberain, M., 1995. Master blind thrust fault hidden under the Zagros folds: Active basement tectonics and surface morphotectonics, Tectonophys 241, 3-224.
- Dick, P., Helle, K., John, R., Qiming, L,. Tom, B., 1999. Logging-While-Drilling images for Geomechanical. Geological and Petrophysical Interpretations. Society of Petrophysicists and Well-Log Analysts.
- Falcon, N., 1974. Southern Iran: Zagros Mountains. In Mesozoic-Cenozoic Orogenic Belts: Data for orogenic studies (Ed. A. M. Spencer), Geological Society of London, Special Publication 4, 199–211.
 
- Intera Petroleum Technologies, Ltd; 1992. Marun Field study. ISBN 91, 554-5621-9.
- Leturmy, P., Molinaro, M., Frizon de lamotte, D., 2010. "Structure timing and morphological signature of hidden reverse basement faults in the Fars Arc of the Zagros (Iran). In Tectonic and Stratigraphic Evolution of Zagros and Makran during the Mesozoic– Cenozoic (Eds P. Leturmy and C. Robin)", Geological Society of London, Special Publication 330, 121–38.
- Jaeger, J.C. and Cook, N.G.W; 1979- Fundamentals of rock mechanics. Chapman & Hall, New York.
- Mouthereau, F., Lacombe, O. and Meyer, B., 2006. The Zagros folded belt (Fars, Iran): constraints from topography and critical wedge modeling, Geophysical Journal International 165, 336–56.
- Nelson, E.J., et al.; 2005. Transverse drilling-induced tensile fractures in the West Tuna area, Gipps land Basin, Australia: implications for the in situ stress regime, 42, 361-371.
- Peska, P. and Zoback, M.D; 1995. Compressive and tensile failure of inclined borehole and determination of in situ stress and rock strength, Journal Geophysics Research 100 (B7), 12791–12811.
- Prensky, S., 1999. Advances in borehole imaging technology and applications,in Lovell, M.A., Williamson, G., and Harvey, P.K., editors, Borehole imaging—applications and case histories, Geological Society [London] Special Publication 159, 1-44.
- Prensky, S.E., 1990. Bibliography of well-log applications, annual update, October 1,1989. September 1,1990: The Log Analyst, 31, no. 6, 395-424.
- Plumb, R.A. and Cox, J.W; 1987. Stress directions in eastern North America determined to 4.5 km from borehole elongation measurements. Journal Geophysics Research, 90, 5513–5522.
- Reinecker, J.; 2003. Borehole breakout analysis from four-arm caliper logs. World Stress Map Project.
- Sherkati, Sh.; 2004. variation of structural Style and basin evolution in the central Zagros.
- Speers, R.G.; 1978- The Geology of the Bangestan Reservoir, Marun Field, report, 3541, oil Service company of Iran Exploitation Geology.
- Sarkarinejad, K., Ghanbarian, M. A 20. The Zagros hinterland fold-and thrust belt in-sequence thrusting",. Journal of Asian Earth Sciences, 85, 66-79.
- M. Sepehr, J. W. Cosgrove "Structural framework of the Zagros Fold-Thrust Belt, Iran", Marine and Petroleum Geology, 21 (2004) 829–43.
- Tingay, M,. Reinecker, J. and Müller, B.. 2008. Borehole breakout and drilling-induced fracture analysis from image logs. World Stress Map Project. Guidelines: Image Logs.
Journal of Tectonics
Volume 1, Sep2015
April 2015
Pages 14-35

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