Stress Path Analysis for Characterization of In Situ Stress State and Effect of Reservoir Depletion on Present-Day Stres
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Original Paper
Stress Path Analysis for Characterization of In Situ Stress State and Effect of Reservoir Depletion on Present-Day Stress Magnitudes: Reservoir Geomechanical Modeling in the Gulf of Suez Rift Basin, Egypt Ahmed Radwan1,3 and Souvik Sen
2,4
Received 16 May 2020; accepted 4 August 2020
A reservoir geomechanical modeling has been attempted in the hydrocarbon-bearing Miocene formations in the offshore Badri field, Gulf of Suez, Egypt. Pore pressure established from the direct downhole measurements indicated sub-hydrostatic condition in the depleted mid-Miocene Hammam Faraun and Kareem reservoirs. Vertical stress (Sv) estimated using bulk density data yielded an average of 0.98 PSI/feet (22.17 MPa/km) gradient. Magnitudes of minimum (Shmin) and maximum (Shmax) horizontal stresses were deduced from the poro-elastic model. Relative stress magnitudes (Sv ‡ Shmax > Shmin) reflect a normal faulting tectonic stress in the Badri field. Pore pressure and stress perturbations (DPP and DSh) in the depleted reservoirs investigated from actual measurements recognized Ôstress pathÕ values of 0.54 and 0.59 against the Hammam Faraun and Kareem Formations, respectively. These stress path values are far away from the normal faulting limit (0.68), indicating induced normal faulting or fault reactivation to be unlikely at the present depletion rate. KEY WORDS: In situ stress, Pore pressure, Depletion, Stress path, Reservoir geomechanics, Badri field.
INTRODUCTION Reservoir geomechanics plays a vital role in well drilling, horizontal well placement and completion optimization (Zoback 2007; Ramdhan and Goulty 2011; Baouche et al. 2020a, b). An accurate
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Faculty of Geography and Geology, Institute of Geological Sciences, Jagiellonian University, Gronostajowa 3a, 30-387 Krako´w, Poland. 2 Geologix Limited, Dynasty Building, Wing A, Level 4, Andheri Kurla Road, Andheri (E), Mumbai, Maharashtra 400059, India. 3 Exploration Department, Gulf of Suez Petroleum Company, Cairo, Egypt. 4 To whom correspondence should be addressed; e-mail: [email protected], [email protected]
assessment of the magnitudes of pore pressure (PP) and principal stresses [vertical stress (Sv) and two horizontal stress tensors—minimum (Shmin) and maximum (Shmax) horizontal stresses] is an important aspect of comprehensive geomechanical modeling (Ganguli 2017; Ganguli et al. 2018; Radwan et al. 2019a, 2020a; Ganguli and Sen 2020), as it helps in understanding the potential risk of production-induced faulting, wellbore instability and solid production (Zoback and Zinke 2002; Haug et al. 2018). Stress state changes in subsurface reservoirs are controlled by changes in PP due to fluid drawdown or fluid injection that affected the horizontal stresses magnitudes during the production or gas storage (Ruistuen et al. 1996; Addis
2020 International Association for Mathematical Geosciences
Radwan and Sen 1997a, b; Hillis 2001; Altmann et al. 2010; Dahm et al. 2015; Mortazavi and Atapour 2018; Li et al. 2019a, b; Candela et al. 2019). Advancing and e
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