Impact of Fault and Reef on Reservoir Pressure Behavior and Production Profile: Case Study- South Iraqi Oilfield
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Abstract
The study area, which consists of carbonate, is located in the unstable Mesopotamian basin on the Arabian plate, which makes it a field with high heterogeneity. It has a discrepancy in its bubble point pressure, which raises concerns about the faults or reefs that caused it. The study's main objective is to determine how faults and reefs impact production performance and pressure behavior under a future development strategy. This goal will be achieved by completing the necessary seismic, static, and dynamic models. After re-evaluating the seismic survey data, the seismic analysis detected many irregular amplitudes of reflected events and abrupt discontinuities, indicating either a reef or a fault. The static model was built based on seismic possible results and to make them as inputs for building the reservoir model. Based on the history-matching results, faults were detected, while reefs were ruled out. The development plan was implemented for the next 20 years in four cases, and case four had the most favorable results among all the cases, with production plateauing at 140 MSTB/D and a cumulative volume equal to 1.09 MMMSTB. The reservoir pressure behavior shows a hierarchical drop in all cases, with some differences, including a sharp decline in the area of the proposed wells and the fault, which has become a compartment that prevents reservoir compensation from adjacent regions.
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References
Abdulredah, S.K. and Al-Jawad, M.S., 2024. Building 3D geological model using non-uniform gridding for Mishrif reservoir in Garraf oilfield. Petroleum Science and Technology, 42(7), pp.809-827. https://doi.org/10.1080/10916466.2022.2136198.
Ahlbrandt, T.S., Pollasro, R.M., Klett, T.R., Schenk, C.J., Lindquist, S.J., and Fox, J.E. 2000. Region 2 assessment summary—Middle East and North Africa, chapter R2, in U.S. Geological Survey Digital Data Series 60.
Ahmed, B.I., Al-Jawad, M.S., 2020. Geomechanical modelling and two-way coupling simulation for carbonate gas reservoir. J Petrol Explor. Prod. Technol. 10, pp. 3619–3648. https://doi.org/10.1007/s13202-020-00965-7.
Ahmed, S., Elwegaa, K., Htawish, M. and Alhaj, H., 2019. Determination of the oil initial in place, reserves, and production performance of the Safsaf C oil reservoir. The International Journal of Engineering and Science, 8(2), pp.86-97.
Al Musawi, J. M., Al Jawad, M. S., 2019. Study of different geostatistical methods to model formation porosity (Cast study of Zubair formation in Luhais oil field). IOP Conf. Ser.: Mater. Sci. Eng. 579 012031. https://doi.org/10.1088/1757-899X/579/1/012031.
Al-Ameri, Th. K., Al-Khafaji, A. J., John, Z. 2009. Petroleum system analysis of the Mishrif reservoir in the Ratawi, Zubair, north and south Rumaila oil fields, Southern Iraq. GeoArabia, 14(4), pp. 91–108. Gulf Petro Link, Bahrain. https://doi.org/10.2113/geoarabia140491.
Al-Dujaili, A. N., Shabani, M., and AL-Jawad, M. S., 2023. Lithofacies and electrofacies models for Mishrif Formation in West Qurna oilfield, Southern Iraq by deterministic and stochastic methods (comparison and analyzing), Petroleum Science and Technology. https://doi.org/10.1080/10916466.2023.2168282.
Al-Dujaili, A. N., Shabani, M., AL-Jawad, M. S., 2021. Identification of the best correlations of permeability anisotropy for Mishrif reservoir in West Qurna/1 oil Field, Southern Iraq, Egyptian Journal of Petroleum, Volume 30, Issue 3, pp. 27-33. https://doi.org/10.1016/j.ejpe.2021.06.001.
Alher, A. A., Aljawad, M. S., Alyasery, A. A., 2018. Estimating the PVT properties for crude oil from a Southern Iraqi oil field. IOP Conf. Ser.: Mater. Sci. Eng. 433, P. 012076. https://doi.org/10.1088/1757-899X/433/1/012076.
Alhusseini, A. K., Hamd-Allah, S. M., 2022. Estimation of initial oil in place for Buzurgan oil field by using volumetric method and reservoir simulation method. Iraqi Geological Journal, 55 (2C), pp. 106-120. https://doi.org/10.46717/igj.55.2C.9ms-2022-08-22.
Al-Jawad, M. S., Kareem, K. A., 2016. Geological model of Khasib reservoir-central area/East Baghdad field. Iraqi Journal of Chemical and Petroleum Engineering, 17(3), pp. 1-10. https://doi.org/10.31699/IJCPE.2016.3.1.
Al-Joumaa, J. H., Al-Jawad, M. S., 2019. Calculating heterogeneity of Majnoon Field/Hartha Reservoir using Lorenz coefficient method. IOP Conf. Ser.: Mater. Sci. Eng. 579 012026. https://doi.org/10.1088/1757-899X/579/1/012026.
Almahdawi, F. H., Alameedy, U. S., Almomen, A., A. Al-Haleem, A., Saadi A., Mukhtar M. F., 2023. The impact of acid fracking injection pressure on the carbonate-Mishrif reservoir: A field investigation. Proceedings of the 2022 International Petroleum and Petrochemical Technology Conference. Springer. https://doi.org/10.1007/978-981-99-2649-7_54.
Al-Rubaye, W. I. T., Hamd-Allah, S. M., 2020. A High-resolution 3D geomodel for giant carbonate reservoir- A field case study from an Iraqi oil field. Journal of Engineering, 26(1), pp.160–173. https://doi.org/10.31026/j.eng.2020.01.12.
Alsharhan, A.S., Nairn, A.E.M. 1997. Sedimentary basins and petroleum geology of the Middle East. Elsevier, Netherlands. https://doi.org/10.1016/B978-0-444-82465-3.X5000-1.
Al-Zubaidy, W., Al-Jawad, M., 2023. Prediction unconfined compressive strength for different lithology using various wireline type and core data for Southern Iraqi field. Journal of Engineering, Baghdad university, 29(11), pp. 109–128. https://doi.org/10.31026/j.eng.2023.11.07.
Asad, M. S., Hamd-Allah, S. M., 2022. 3D Geological modelling for Asmari reservoir in Abu Ghirab oil field. Iraqi Journal of Science, Vol. 63, No. 6, pp. 2582-2597. https://doi.org/10.24996/ijs.2022.63.6.24.
Baker, H. A., Al-Rikaby, A. S., 2017. Reservoir characterizations and reservoir performance of Mishrif formation in Amara oil field. Journal of Engineering, 23(12). Pp. 33-50 https://doi.org/10.31026/j.eng.2017.12.03.
Baker, H. A., Al-Rikaby, A., Salih, I. S., 2019. Evaluation of formation capacity and skin phenomena of Mishrif reservoir -Garraf oil field. IOP Conference Series: Materials Science and Engineering. 579, P. 012039. https://doi.org/10.1088/1757-899X/579/1/012039.
Boschetti, T., Awadh, S.M., Al-Mimar, H.S., Iacumin, P., Toscani, L., Selmo, E. and Yaseen, Z.M., 2020. Chemical and isotope composition of the oilfield brines from Mishrif Formation (southern Iraq): Diagenesis and geothermometry. Marine and Petroleum Geology, 122, p.104637. https://doi.org/10.1016/j.marpetgeo.2020.104637.
Buday, T., Jassim, S. 1987. The regional geology of Iraq: tectonics, magmatism, and metamorphism. In: Kassab, I.I. and Abbas, M.J., Eds., Geology of Iraq, Geologic Survey, Baghdad, pp.1-445. https://doi.org/10.4236/eng.2016.89054.
Hashim, A. H., Al-Jawad, M. S., Klati, K. A., 2023. Utilizing reservoir model to optimize future oil production for hydraulic fracture wells in tight reservoir. Iraqi Geological Journal, 56 (2B), pp. 21-36. https://doi.org/10.46717/igj.56.2B.2ms-2023-8-11.
Jassim, S.Z., Goff, J.C. 2006. Geology of Iraq. Dolin, Prague and Moravian Museum, Brno. Czech Republic, 341p.
Karim, H.H. 1989. Qualitative interpretation of Basrah aeromagnetic map. J. Geol. Soc. Iraq, 22(2), pp. 1-8.
Karim, H.H. 1993. General properties and patterns of the gravity field of Basrah area, SE Iraq. Iraqi Geol. J., 26(1), pp. 150-178.
Khawaja, A. M., Thabit, J. M., 2021. Interpretation of 3D seismic reflection data to reveal stratigraphic setting of the reservoir of Mishrif formation in Dujaila oil field, Southeast of Iraq. Iraqi Journal of Science, 62(7), pp. 2250–2261. https://doi.org/10.24996/ijs.2021.62.7.14.
Lazim, S.A., Hamd-Allah, S.M. and Jawad, A., 2018. Permeability estimation for carbonate reservoir (Case study/South Iraqi Field). Iraqi Journal of Chemical and Petroleum Engineering, 19(3), pp.41-45. https://doi.org/10.31699/IJCPE.2018.3.5.
Mondol, N. H., 2010. Seismic exploration. In Petroleum Geoscience: From Sedimentary Environments to Rock Physics (pp. 375–402). Springer Berlin Heidelberg. https://doi.org/10.1007/978-3-642-02332-3_17.
Oil Exploration Company, 2013. Final field report of 3D seismic survey for Abo Amood field, internal report, Ministry of oil, P.12.
Petronas, C.I.H., 2017. Garraf final development plan (FDP), unpublished study.
Sadooni, F.N. Aqrawi, A.A.M., 2000. Cretaceous sequence stratigraphy and petroleum potential of the Mesopotamian basin, Iraq. In Scott, B. and Al-Sharhan, A.S. (Eds.), Middle East Models of Jurassic/Cretaceous
Carbonate Systems. SEPM Special Publication, 69, pp. 315-334. https://doi.org/10.2110/pec.00.69.0315.
Shamkhi, M. K., Aljawad, M. S., 2021. Representative sector modeling and waterflooding performance in Rumaila oilfield. Iraqi Journal of Science. 62(1), pp. 192-203. https://doi.org/10.24996/ijs.2021.62.1.18.
Sharland, P.R., Archer, R., Casey, D.M., Davies, R.B., Hall, S.H., Heward, A.P., Horbury, A.D. Simmons, M.D. 2001. Arabian plate Sequence stratigraphy. GeoArabia Special Publication 2, Gulf PetroLink, Bahrain, 371P.
Trezzi, S., Seliem, A., Mahgoub, M., Cambois, G., Glushchenko, A., Vasilyev, P., al Kobaisi, A. S., 2022. Unlocking UAE’s largest 3D onshore seismic survey - Processing Challenges in Eastern Abu Dhabi. Society of Petroleum Engineers - ADIPEC . https://doi.org/10.2118/211634-MS.