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Critical Casing Points: Identification of Najmah Top and Sublayers with Wellsite Inorganic Geochemistry in Kuwait Carbonate Reservoir

Authors
Jalal Dashti (Kuwait Oil Company) | Mashari Al-Awadi (Kuwait Oil Company) | Moustafa Moshref (Kuwait Oil Company) | Ahmad Shoeibi (Geolog International) | Alessandro Pozzi (Geolog International) | Javad Estarabadi (Geolog International)
DOI
https://doi.org/10.2118/191024-MS
Document ID
SPE-191024-MS
Publisher
Society of Petroleum Engineers
Source
IADC/SPE Asia Pacific Drilling Technology Conference and Exhibition, 27-29 August, Bangkok, Thailand
Publication Date
2018
Document Type
Conference Paper
Language
English
ISBN
978-1-61399-574-7
Copyright
2018. IADC/SPE Asia Pacific Drilling Technology Conference
Disciplines
5.8 Unconventional and Complex Reservoirs, 1.6.10 Running and Setting Casing, 1.6 Drilling Operations, 0.2 Wellbore Design, 3 Production and Well Operations, 5 Reservoir Desciption & Dynamics, 5.1.1 Exploration, Development, Structural Geology, 5.1.3 Sedimentology, 1.6.9 Coring, Fishing, 5.1 Reservoir Characterisation, 2.2 Installation and Completion Operations, 1.2.3 Rock properties, 5.8.7 Carbonate Reservoir
Keywords
Chemostratigraphy, Casing point, decisions making, minimize NPT
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The Middle Jurassic strata of the NE Arabian Plate compose part of the largest world-class petroleum system, with more than 250 billion barrels of proven hydrocarbons. The Najmah Formation, one of those productive strata located in Kuwait, represents a transgressive deposition within a deep basinal settings and anoxic environments; with its black shales interbedded with bituminous limestones the Najmah Formation works as both reservoir and source rock. Due to its organic richness and maturity, the middle Jurassic formation can be considered the best potential conventional/unconventional play in the Kuwaiti Province.

Evaporates of Gotnia, a HPHT formation overlaying the Najmah reservoir, are dealt with high mud weight (19-21 ppg), to counter the high pressured patches. The identification of Najmah stratigraphic top is crucial for setting the casing point, then reducing the mud weight for the final drilling phase. Missing this critical casing point may lead to several rig NPT and related operational cost increments, such as cement jobs and, in extreme cases, may lead to missing and abandoning the well. When the standard investigation methods, as the optical microscopy, or Gamma Ray failed in identifying the Najmah top, due to the similarity between its limestones and those of Gotnia Formation, the ED X-ray fluorescence (XRF) and X-ray diffraction (XRD) established distinctive formations geochemical ‘fingerprints’, as well as their sedimentary patterns, providing absolute certainties about the casing point position despite a misleading stratigraphy.

The technique of Chemostratigraphy, applied in this study on five exploratory wells, can increase the value of such geochemical fingerprints, providing not only applications as critical casing points ID but also a means to unify stratigraphic schemes, i.e. develop stable reference stratigraphic frameworks: changes in rock geochemistry reflect changes in the relative sea level, thus sediment supply/accommodation, oxygenation and diagenetic conditions.

Once inside the Najmah Formation, the elemental and mineralogical patterns point out different formation sublayers, corroborating many sedimentological and stratigraphic evidences obtained from outcrops and cores analyses. Some redox-sensitive trace metals are delivered to the sediment in presence of organic matter (Ni, Mo, V and U) under anoxic-euxinic conditions and tend to exhibit covariation with TOC, highlighting the best pay zones in the Najmah Kerogen sublayers. Some other metals such as Mn, Fe and Zn, in carbonate sequences, can evaluate the amount of carbonate cement (sparite) among the microcrystalline matrix (micrite); such metals, correlated with mud gas concentration, reveal the most porous sections within calcareous sublayers.

Having access to more detailed rock properties allow for one time decisions making, such as the identification of casing/coring points and the characterization of a reservoir in all its sublayers. Chemostratigraphy has led the operational team to minimize NPT and related costs, the completion team to the right well profiles and the production team to a better overview of the reservoir.

File Size  1 MBNumber of Pages   13

Abed Mahdi Saleh Al-Badry, 2005. Stratigraphy and geochemistry of jurassic formations in selected Sections - north iraq. A thesis submitted to the college of science university of baghdad as apartial fulfillment of the requirments for the degree of Doctor of philosophy in geology (stratigraphy).

Adnan A.M. Aqrawi and Balazs Badics, 2015. Geochemical characterisation, volumetric assessment and shale-oil/gas potential of the Middle Jurassic-Lower Cretaceous source rocks of NE Arabian Plate. GeoArabia, 2015, v. 20, no. 3, p. 99-140 Gulf PetroLink, Bahrain.

A.E.M. Nairn, A.S. Alsharhan, 2003. Sedimentary Basins and Petroleum Geology of the Middle East.

Ahmad J. Al-Eidan, Nilotpaul Neog, Srinivasa R. Narhari, Areej Al-Darmi, Rawan H. Al-Mayyas, Thomas L. De Keyser and Christian Perrin, 2009. Carbonate Facies and Depositional Environments of the Marrat Formation (Lower Jurassic), North Kuwait.

Bhaskar Chakrabarti, Meshal Al-Wadi, Hanan Abu-Habbiel & Abdul Mohsen Al-Enezi, Diagenetic Controls on Carbonate Reservoir Quality of Jurassic Middle Marrat Formation in Burgan Field, Kuwait. Abstract # 1070927, AAPG, October 23-26, 2011, Milan Italy.

Bilal U. Haq and Abdul Motaleb Al-Qahtani, 2005. Phanerozoic cycles of sea-level change on the Arabian Platform. GeoArabia, Vol. 10, No. 2, 2005 Gulf PetroLink, Bahrain.

D. Singha Ray, A. Al-Shammeli and W. Al-Khamees, Kuwait Oil Co.; M. Fuchs and V. De Groen, Beicip-Franlab, 2013. Depositional and Diagenetic sedimentological model of Najmah-Sargelu Formation, Umm Gudair, Kuwait. IPTC 17117.

Hamad Al-Saad, Abdel Galil Abdel Hamid Hewaidy, 1999. Lithofacies and depositional environments of the Lower Jurassic sediments in Central Saudi Arabia.

Martin A. Ziegler, 2001. Late Permian to Holocene Paleofacies Evolution of the Arabian Plate and its Hydrocarbon Occurrences. GeoArabia, Vol. 6, No. 3, 2001 Gulf PetroLink, Bahrain.

Maurice E. Tucker, V. Paul Wright, 1990. Carbonate Sedimentology.

Michael D. Simmons, Peter R. Sharland, David M. Casey, Roger B. Davies and Owen E. Sutcliffe, 2007. Arabian Plate sequence stratigraphy: Potential implications for global chronostratigraphy. GeoArabia, Vol. 12, No. 4, 2007 Gulf PetroLink, Bahrain.

Moujahed Al-Husseini, 2009. Update to Late Triassic - Jurassic stratigraphy of Saudi Arabia for the Middle East Geologic Time Scale. GeoArabia, v. 14, no. 2, 2009, p. 145-186 Gulf PetroLink, Bahrain.

P.K. Nath, R. Prasad, B. Khan, S.K. Singh, R. Abu-Taleb & S. Bader(Kuwait Oil Co.). Integrated Geo-statistical Modeling - An Effective Tool to Meet the Exploration Challenge of Low Porosity Carbonate Reservoir within Najmah-Sargelu Formation, Kuwait (SPE 143526).

Pearce, T.J., D.S. Wray, K.T. Ratcliffe, D.K. Wright, and A. Moscariello, 2005, "Chemostratigraphy of the Upper Carboniferous Schooner Formation, southern North Sea", in J.D. Collinson, D.J. Evans, D.W. Holliday, and M.S. Jones, eds., Carboniferous hydrocarbon geology: The southern North Sea and surrounding onshore areas: Yorkshire Geological Society, Occasional Publications series, v. 7, p. 147-164.

Rasha Al-Moraikhi, Naveen Verma, Prasanta Mishra, Alexander J.P. Houben, Tom van Hoof, and Roel Verreussel, 2014. An Updated Chronostratigraphic Framework for the Jurassic of the Arabian Platform: Towards a Regional Stratigraphic Standard.

Ratcliffe, K.T., A. Morton, D. Ritcey, and C.E. Evenchick, 2007, "Whole-rock geochemistry and heavy mineral analysis as exploration tools in the Bowser and Sustut basins, British Colombia, Canada", Bulletin of Canadian Petroleum Geology, v. 55, p. 320-33.

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