Implications on oil trapping in the Kifl field of Iraq through geophysical investigations

Document Type : Research Paper

Authors

1 Institute of Geophysics, University of Tehran, Tehran, Iran.

2 Directorate of Education of Basra, Ministry of Education, Basra, Iraq.

3 School of Mining Engineering, College of Engineering, University of Tehran, Tehran, Iran.

4 Department of Applied Geology, College of Sciences, University Babylon, Babylon Iraq.

Abstract

Potential field geophysical measurements were conducted in the west of Kifl region in central Iraq to image a plausible oil-trapping reservoir. Ground-based magnetometry and gravimetry surveys were conducted to investigate this region by covering an area of 16  24 km by designing a regular grid spacing of 250 m. After preprocessing potential field data, different filters were utilized to separate the residuals from the regional anomalies. The complicated tectonic setting of the studied area was imaged by recognition of the fault system through simulation of the magnetic and gravity anomalies, which facilitates the configuration display of the oil-trapping mechanism. The geometry of a fault system was derived from parametric inversion of gravity data. The magnetic anomalies were extended with the trends of NS, NW, and NE and reached a maximum value of 55 nT. However, the gravity anomalies appeared with the same extensions and values ranging from -3.3 to 1.5 mGal. The intense magnetic susceptibility amount of the reservoir rocks is arising from chemical processes and iron-oxide ion replacements, accompanied by the migration and accumulation of hydrocarbon. Incorporating the results from the Euler’s depth estimation, parametric data modeling along with logging data assisted simultaneous modeling of the magnetic and gravity data. The 2D geological model of the subsurface layers at the Kifl area presents a graben-horst fault system within a thick sequence of sediment. Geological characteristics extracted from geophysical data modeling provided insightful information on the nature and essence of the hydrocarbon reservoirs in the Kifl area. It has formed through tectonic deformation and tension over the Arabian plate during the Permian – Paleocene cycle. Hence, it can be concluded that the aforementioned fault system has divided the hydrocarbon reservoirs.

Keywords

Main Subjects

References

[1] Nabighian M.N, Ander M. E, Grauch V. J. S, Hansen R. O, LaFehr T. R, Li Y, Pearson W.C, Peirce J. W, Phillips J. D, Ruder M. E (2005) Historical development of gravity method in exploration. Geophysics 70:63–89.
[2] Wang J, Meng X, Li F (2017) New improvements for lineaments study of gravity data with improved Euler inversion and phase congruency of the field data. Journal of Applied Geophysics 136:326–334.
[3] Finn C.A, Morgan L.A (2002) High-resolution aeromagnetic mapping of volcanic terrain, Yellowstone National Park: Journal of Volcanology and Geothermal Research 115: 207–231.
[4] Ross G.M, Broome J, Miles W (1994) Potential fields and basement structure: Western Canada Sedimentary Basin: in Mossop, G.D., and Shetsen I., Compilers, Geological Atlas of the Western Canada Sedimentary Basin: Canadian Society of Petroleum Geologists and Alberta Research Council, 41– 46.
[5] Spaid-Reitz M, Eick P.M (1998) HRAM as a tool for petroleum system analysis and trend exploration: a case study of the Mississippi Delta survey, southeast Louisiana. Canadian Journal of Exploration Geophysics 34:83–96.
[6] Peirce J.W, Goussev A.A, McLean R, Marshall M (1999) Aeromagnetic interpretation of the Dianango Trough HRAM survey, onshore Gabon: SEG Extended Abstracts 18:343– 346.
[7] Ali M. Y, Watts B, Farid A (2014) Gravity anomalies of the United Arab Emirates: Implications for basement structures and infra-Cambrian salt distribution. Geo.  Arabia 19(1):85–112.
[8] Stadtler C, Fichler C, Hokstad K, Myrlund E.A, Wienecke S, Fotland B (2014). Improved salt imaging in a basin context by high resolution potential feld data: Nordkapp Basin, Barents Sea. Geophys. Prospect. 62: 615–630.
[9] Hackney R, Goodwin J, Hall L, Higgins K, Holzrichter N, Johnston S, Morse M, Nayak G.K, Petkovic P (2015) Potential-field data in integrated frontier basin geophysics: Successes and challenges on Australia’s continental margin. Mar. Pet. Geol. 59: 611–637.
[10] Kovac P, Cevallos C, Feijth J (2016) Targeting oil and gas in the Perth Basin using an airborne gravity gradiometer. First Break 34: 51-58.
[11] Mousa A, Mickus K, Al-Rahim A (2017) The thickness of cover sequences in the Western Desert of Iraq from a power spectrum analysis of gravity and magnetic data. Journal of Asian Earth Sciences 138:230–245.
[12] Peng G, Liu Z, Xu K, Bai Y, Du R (2018) Efficient 3D inversion of potential feld data using fast proximal objective function optimization algorithm. J. Appl. Geophys. 159: 108-115.
[13] Ocaño F.M.O, Gallardo L.A, Romo-Jones J.M, Perez-Flores M.A (2019) Structure of the Cerro Prieto Pull-apart basin from joint inversion of gravity, magnetic and magnetotelluric data. J. Appl. Geophys. (in press).
[14] Dobrin M.B, Savit C.H (1988) Introduction to Geophysical Prospecting. Fourth Edition. McGraw Hill Book Company, pp.865.
[15] Gallardo L. A, Antonio M, Enrique T (2003) A versatile algorithm for joint 3D inversion of gravity and magnetic data. Geophysical J. 68:949–959.
[16] Schmidt S, Götze H. J, Plonka C, Lahmeyer B (2011) Hybrid modelling of gravity, gravity gradients and magnetic fields. Geophysical Prospecting 59:1046–1051.
[17] Thompson D.T (1982) EULDPH: A new technique for making computer-assisted depth estimates from magnetic data. Geophysics 47:31–37.
[18] Reid A.B, Allsop J.M, Granser H, Millet A.J, Somerton I.W (1990) Magnetic interpretation in three dimensions using Euler deconvolution. Geophysics 55:80–91.
[19] Oskooi B, Mirzaei M, Moghaddam M.M, Mohammadi B, Ghadim F (2015) Integrated interpretation of the magnetotelluric and magnetic data from Mahallat geothermal field, Iran. Article in Studia Geophysica at Geodaetica. DOI: 10.1007/s11200-014-1235-1.
[20] Bournas N, Galdeano A, Hamoudi M, Baker H (2003) Interpretation of the aeromagnetic map of Eastern Hoggar (Algeria) using the Euler deconvolution, analytic signal, and local wavenumber methods. J. Afr. Earth Sci. 37:191–205.
[21] Chakravarthi V, Sundararajanb N (2005) INVGRAFALT–A Fortran code for Marquardt inversion of gravity anomalies of faulted beds with varying density. Computers & Geoscience 31:1234–1240.
 [22] Marquardt D.W (1963) An algorithm for least-squares estimation of nonlinear parameters, J. Soc. Indian Appl. Math. 11:431–441.
[23] Chakravarthi V, Sundararajan N (2004) Ridge regression algorithm for gravity inversion of fault structures with variable density. Geophysics 69:1394–1404.
[24] Oldenburg D.W, Li Y (2005) Inversion for applied geophysics: a tutorial. In: Butler, D. K. (Ed.), Near-surface Geophysics. SEG., pp. 89–150
[25] Götze H.J, Lahmeyer B (1988) Application of three-dimensional interactive modelling in gravity and magnetics: Geophysics 53(8):1096–1108.
[26] Schmidt S, Götze H. J (1998) Interactive visualization and modification of 3-D models using GIS functions. Physics and Chemistry of the Earth 23:289–295.
[27] Alvers M.R, Schmidt S, Götze, H. J, Fichler C (2010) IGMAS+ software for 3D gravity, FTG and magnetic modeling–Towards semantic constraints. EGM 2010 International Workshop, Capri, Italy, Expanded Abstracts.  
[28] O’Brian J, Rodriguez A, Sixta D, Davies M. A, Houghton P (2005) Resolving the K-2 salt structure in the Gulf of Mexico. The Leading Edge 24:404–409.
[29] Fichler C, Rueslatten, H, Gram C, Ingebrigtsen A, Olesen O (2007) Salt interpretation in the Nordkapp Basin, Barents Sea, with special focus on magnetic data. EGM International Workshop Innovation in EM, Gravity and Magnetic Methods: a New Perspective for Exploration, Capri, 16–18 April. Extended Abstract.
[30] Marello L, Ebbing J, Gernigon L (2013) Basement inhomogeneities and crustal setting in the Barents Sea from a combined 3D gravity and magnetic model. Geophys. J. Int. 193: 557–584.
[31] Ghazalaa H, Ismael M, Lameesa I, Haggaga M (2018) Structural study using 2D modeling of the potential field data and GIS technique in Sohag Governorate and its surroundings, Upper Egypt.  NRIAG Journal of Astronomy and Geophysics 7:334–346.
[32] Sissakian V. K, Mohammed B. S (2007) Geology of Iraqi Western Desert. Iraqi Bull. Geol. Min. Special Issue: 51–124.
[33] Fouad S. F. A (2010) Tectonic and structural evolution of the Mesopotamia foredeep, Iraq. Iraqi Bulletin of Geology and Mining 6:41–53.
[34] Mobil Oil Company (1985) Hydrocarbon Potential, West Baghdad Area, Central Iraq, O.E.C. documents, 32 p.
[35] Jassim S.Z, Goff J. C (2006) Geology of Iraq, Czech Republic, ISBN 80-7028-287-8, pp 341. Prague, 35-52.
[36] Al-Banna A (1992) Gravity lineaments, fault trends and depth of the basement rocks in Western Desert. Iraqi J. Sci. 33:63–79.
[37] Hijab B. R, Aldabbas M. A (2000) Tectonic evolution of Iraq. Iraqi Geological Journal 32:26–47.
[38] Oil Exploration Company (1991) Kifl 3D survey, pre- planning report, Geophysical study dept., O.E.C. document, 88p.
[39] Li Y, Oldenburg D. W (1998) Separation of regional and residual magnetic field data. Geophysics 63(2):431–439.
[40] Nabighian M.N (1972) The analytic signal of two-dimensional magnetic bodies with polygonal cross-section: Its properties and use for automated anomaly interpretation. Geophysics 37:507-517.
[41] Nabighian M.N (1974) Additional comments on the analytic signal of two-dimensional magnetic bodies with polygonal cross-section. Geophysics 39:85-92.
[42] Fouad S.F.A (2007) Tectonic and structural evolution, Geology of Iraqi Western Desert. Iraqi Bull. Geol. and Min. 1:29–50.
[43] Fouad S.F.A, Nasir W.A.A (2009) Tectonic and structural evolution of Al-Jazira area. Geology of Al-Jazira Area, Iraqi Bulletin of Geol. and Min. 3:33–48.
[44] Mallick K, Vasanthi A, Sharma K. K (2012) Bouguer Gravity Regional and Residual Separation Application to Geology and Environment. Capital Pub. Co. pp. 250.
[45] Sissakian V, Al-Ansari N, Knutsson S (2014) Origin of Some Transversal Linear Features of NE-SW Trend in Iraq, and Their Geological Characters. Natural Science 6:996–1011.
[46] Hunt Ch. P, Moskowitz B. M, Banerjee S. K (1995) Magnetic Properties of Rocks and Minerals. Rock Physics and Phase Relations. A Handbook of Physical Constants. AGU Reference Shelf 3. Copyright 1995 by the American Geophysical Union.               
[47] Al-Kubaisi M. S, Al-Jarah O. B, Abdul-Jabbar A. A (2014) Neotectonics of Al-Thirthar, Al-Habbaniya, Al-Razzazah Depressions, Central Iraq, by using Remote Sensing Data. Iraqi Journal of Science 55(2B):790–801.
 [48] Liu Q, Chan L, Li H, Wang F, Zhang S, Xia X, Cheng T (2004) Relationship between magnetic anomalies and hydrocarbon microseepage above the Jingbian gas field, Ordos basin, China. AAPG Bulletin 88:241–251.
[49] Schneider J, Bechsta T, Machel H. G (2004) Covariance of C- and O-isotopes with magnetic susceptibilities a result of burial diagenesis of sandstones and carbonates: an example from the Lower Devonian La Vid Group,Cantabrian Zone, NW Spain. Int. J. earth Sci. 93:990–1007.
[50] Schumacher D (1996) Hydrocarbon-induced alteration of soils and sediments in Hydrocarbon migration and its near surface expression. AAPG Memoir 66:71–89.
[51] Sharland P. R, Archer R, Casey D. M, Hall S. H, Heward A. P, Horbury A. D, Simmons M.D (2001) Arabian Plate Sequence Stratigraphy. GeoArabia Special Publication 2, Gulf Petrolink, Bahrain, 371 p.
[52] Iraqi Geological Survey and Mine Research Company (1990) Internal report of Kifl oil field. 38pp.
International Journal of Mining and Geo-Engineering
Volume 56, Issue 4
December 2022
Pages 391-400

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