Assessment of the stress path and prediction of fault activity in oil reservoirs(Ahvaz oil field)

Document Type : Research Paper

Authors

1 Department of Earth Sciences, Science and Research Branch, Islamic Azad University, Tehran, Iran

2 Department of Petroleum Engineering, Omidiyeh Branch,Islamic Azad University, Omidiyeh, Iran.

Abstract

Understanding fault conditions and slip behavior is essential throughout the lifespan of a reservoir. The formation of new gaps or faults within a reservoir significantly increases the costs and risks associated with drilling operations. This research examined the potential for fracture formation resulting from discharge and a reduction in pore pressure. Well drilling data from a reservoir in southwest Iran were used to calculate the principal stresses and develop a geomechanical model. Based on this model, the safe mud weight window for drilling was also determined. Finally, the potential for fracture formation was assessed throughout the reservoir's production phase. The results show that the mud loss pressure in the reservoir corresponds to the minimum horizontal stress value (σ3), with an average value of approximately 41.75 MPa. The stress regime in the reservoir is a normal (σv> σH> σh), and the safest drilling direction is parallel to the vertical stress. According to the results, the orientations of the minimum and maximum horizontal stresses are N16W-S16E and N74E-S74W, respectively, with a standard deviation of 6.5 degrees. As a result of the production and discharge of hydrocarbon reservoirs, the initial pore pressure decreases. The decrease in pore pressure causes a change in the effective stress and subsequently the in situ stress field, and this phenomenon will cause new fractures and faults in the reservoir. The formation of new faults due to reservoir discharge is more likely to occur in the sandstone layers of the studied reservoir compared to the limestone and dolomite layers.

Keywords

Main Subjects

Article Title [Persian]

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References

Abdelghany, W.K., Hammed, M., Radwan, A.E., 2023. Implications of machine learning on geomechanical characterization and sand management: a case study from Hilal field, Gulf of Suez: Egypt: Journal of Petroleum Exploration and Production Technology, 13(1): 297-312.
Abdelghany, W.K., Radwan, A.E., Elkhawaga, M.A., Wood, D.A., S. S., Kassem, A.A., 2021. Geomechanical modeling using the depth of-damage approach to achieve successful underbalanced drilling in the Gulf of Suez rift basin: Journal of Petroleum Science and Engineering, 202:108311.
Abdideh, M., Dastyaft, F., 2022. Stress field analysis and its effect on selection of optimal well trajectory in directional drilling (case study: southwest of Iran): Journal of Petroleum Exploration and Production Technology,12(3): 835-849.
Allahkarampour, D.M., Seyrafian, A., Vaziri-Moghaddam, H. 2010. TheAsmari Formation, north of the Gachsaran (Dill anticline), southwest Iran:facies analysis, depositional environments and sequence stratigraphy; Carbonates and Evaporates, 25:145-160
Almalikee, H.S.A., Al-najim, F.M.S., 2018. Overburden stress and pore pressure prediction for the North Rumaila oil field: Modeling Earth Systems and Environment, 4(3): 1181-1188.
Anees, A., Zhang, H., Ashraf, U., Wang, R., Liu, K., Mangi, H.N., Jiang, R., Zhang, X., Liu, Q., Tan, S., Shi, W. 2022. Identification of Favorable Zones of Gas Accumulation via Fault Distribution and Sedimentary Facies: Insights From Hangjinqi Area, Northern Ordos Basin: Frontiers in Earth Science,9: 822670.
Arian, M., Bagha, N., Khavari, R., Noroozpour,H., 2012. Seismic sources and neo-tectonics of Tehran area (North Iran): Indian Journal of Science and Technology,5(3): 2379-2383.
Ashena, R., Elmgerbi, A., Rasouli, V., Ghalambor, A., Rabiei, M., Bahrami, A. 2020. Severe wellbore instability in a complex lithology formation necessitating casing while drilling and continuous circulation system: Journal of Petroleum Exploration and Production Technology, 10(4):1511-1532.
Ashena, R., Roohi, A., Ghalambor, A. 2022. Wellbore stability analysis in an of shore high-pressure high-temperature, gas field revealed lost times due to lack of well trajectory optimization. SPE Int Conf Exhibit Format Damage Control. https://doi.org/10.2118/ 208864-MS.
Ashraf, U., Zhang, H., Anees, A. 2024.Assessment of lake-level variations to decipher geological controlling factors and depositional architecture of Lake Fuxian, Yunnan Plateau: preliminary insights from geophysical data: Geomechanics and Geophysics for Geo-Energy and Geo-Resources,10: 64.
Azadpour, M., Shad Manaman, N., Kadkhodaie-Ilkhchi, A., Sedghipour, M.R. 2015. Pore pressure prediction and modeling using well logging data in one of the gas fields in south of Iran: Journal of Petroleum Science and Engineering ,128:15-23.
Bagheri, H., Tanha, A.A., Doulati Ardejani, F., Heydari-Tajareh, M., Larki, E. 2021. Geomechanical model and wellbore stability analysis utilizing acoustic impedance and reflection coefficient in a carbonate reservoir: Journal of Petroleum Exploration and Production Technology, 11(11): 3935-3961.
Bashmagh, N.M., Lin, W., Murata, S., Yousef, F., Radwan, A.E. 2022. Magnitudes and orientations of present-day in-situ stresses in the Kurdistan region of Iraq: insights into combined strike-slip and reverse faulting stress regimes: Journal of Asian Earth Sciences, 239:105398.
Berberian, M. 1995. Master “blind” thrust faults hidden under the Zagros folds: active basement tectonics and surface morphotectonics, Tectonophysics, 241(3): 193-224
Darvishpour, A., Seifabad, M.C., Wood, D.A., Ghorbani, H. 2019. Wellbore stability analysis to determine the safe mud weight window for sandstone layers: Petroleum Exploration and Development, 46(5): 1031-1038.
Edress, N.A., Darwish, S., Ismail, A., 2021. Geochemical characterization of the source rock intervals,beni-suef basin, west nile valley, Egypt: Open Geosciences, 13(1): 1536-1551.
Farsimadan, M., Dehghan, A.N., Khodaei, M. 2020. Determining the domain of in situ stress around Marun Oil Field’s failed wells, SW Iran: Journal of Petroleum Exploration and Production Technology, 10: 1317-1326.
Fjar, E., Holt, R.M., Horsrud, P., Raaen, A.M., Risnes, R. 2008. geological aspects of petroleum related rock mechanics: Developments in petroleum science, 53: 103-133.
Gholami, R., Aadnoy, B., Foon, L.Y., Elochukwu, H. 2017. A methodology for wellbore stability analysis in anisotropic formations: a case study from the Canning Basin, Western Australia: Journal of Natural Gas Science and Engineering, 37: 341-360.
Han, Y., Liu, C., Phan, D., Alruwaili, K., Abousleiman, Y. 2019. Advanced wellbore stability analysis for drilling naturally fractured rocks. In: SPE middle east oil and gas show and conference. https://doi. org/10.2118/195021-MS.
Hashemi. S.S., Taheri, A., Melkoumian, N. 2014. Shear failure analysis of a shallow depth unsupported borehole drilled through poorly cemented granular rock: Engineering geology, 183: 39-52.
Heidbach, O., Rajabi, M., Cui, X., Fuchs, K., Müller, B., Reinecker, J., Reiter, K., Tingay, M., Wenzel, F., Xie, M. O., Ziegler, M.-L., Zoback, M., Zoback 2018. The World Stress Map database release 2016: Crustal stress pattern across scales: Tectonophysics, 744: 484-498.
Hoseinpour,M., Riahi, M.A. 2022. Determination of the mud weight window, optimum drilling trajectory, and wellbore stability using geomechanical parameters in one of the Iranian hydrocarbon reservoirs: Journal of Petroleum Exploration and Production Technology, 12(1): 63-82.
Hosseini, E., Neshat Ghojogh, J., & Habibnia, B. 2015. Characterization of fractures of Asmari Formation by using image logs, case study: Marun Oilfield: American Journal of Oil and Chemical Technologies, 3(5): 45-47.
Khodami, E., Ramezanzadeh, A., Sharifi, A. 2021. The 3D simulation of the effect of casing standoff on cement integrity by considering the direction of horizontal stresses in one of the wells of Iranian oil fields, Journal of Petroleum Science and Engineering, 206: 108980.
Mohammed, H.Q. 2017. Geomechanical analysis of the wellbore instability problems in Nahr Umr Formation southern Iraq. Missouri University of Science and Technology. https://scholarsmine.mst. Edu/masters theses/7695 Mondal S,
Najafi, M., Lajmorak, S. 2020. Contractional salt-tectonic system in the south Dezful embayment, Zagros: Journal of Structural Geology, 141: 104204
Nazeri, S., Abdi, F., Ismail, A.,2023. Earthquake source parameters in Zagros region (Iran) from the time-evolutive P-wave displacement: Scientific Reports 13: 17964.
Qing, L., Shi-hao, L., Weize, M., Yang, Y., Xu, L. 2024. A numerical simulation-based ANN method to determine the shear strength parameters of rock minerals in nanoscale: Computers and Geotechnics, 169: 106175.
Radwan, A., Sen, S. 2021. 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: Natural Resources Research, 30: 463-478.
Rahimi, R. 2014. The effect of using different rock failure criteria in wellbore stability analysis. Missouri University of Science and Technology. Missouri University of Science and Technology ProQuest Dissertations & Theses, 1561248.
Sherkati, Sh., Molinaro, M., Frizon de Lamotte D., Letouzey, J. 2005. Detachment folding in the Central and Eastern Zagros fold-belt (Iran): salt mobility, multiple detachments and late basement control:Journal of Structural Geology, 27 (9): 1680-1696.
Shraf, U., Hucai, Z., Aqsa, A., Muhammad, A., Xiaonan, Z., Saiq, S. Hassan, N. 2020.Controls on Reservoir Heterogeneity of a Shallow-Marine Reservoir in Sawan Gas Field, SE Pakistan:Implications for Reservoir Quality Prediction Using Acoustic Impedance Inversion: Water 12(11):2972
Taghipour, M., Ghafoori, M., Lashkaripour, G. R. 2021. A Geomechanical Evaluation of Fault Reactivation Using Analytical Methods and Numerical Simulation: Rock Mechanics and Rock Engineering,54: 695-719.
Yifan, C, Y., Wanting, H., José, M. C., Wubing, D., Zhiwei, W. 2024.Thermo-poroelastic AVO modeling of Olkaria geothermal reservoirs: Geoenergy Science and Engineering: 241: 213166.

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History

  • Receive Date: 25 November 2024
  • Revise Date: 25 February 2025
  • Accept Date: 10 March 2025

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