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Laffan Formation

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Journal Article
Published: 01 August 2007
Petroleum Geoscience (2007) 13 (3): 227–240.
... deepening of the basin during the Coniacian and Santonian enabled the deposition of pelagic marls of the Coniacian Laffan Formation and the development of a carbonate turbidite system within the overlying Santonian Ilam Formation. The Ilam Formation occurs within slope and pelagic carbonates and consists...
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Seismic classification data at well locations. Coarsening/fining-upward depositional sequences derived from gamma-ray log data are shown for each well. The gamma-ray-derived high frequency cyclicity is superimposed on a general third-order increase in accommodation space shown in Figure 2. Seismic facies are numbered sequentially. All wells except C1 are at platform locations where seismic data are not good quality because of undershoot acquisition. The tie between top and base Laffan Formation and GR log slightly deteriorates at these locations. Oil production rate from the Mishrif Formation in well C1 (facies class 9) is significantly higher than that from other wells. The Laffan Formation is seismically thin (20 m) and facies class 8 indicates a heterogeneous nature of the Laffan–Mishrif interface. This interface cannot be interpreted using a broad band inverted impedance data (below). Well E1 is the only well showing oil, although it is non-commercial, within the middle Ilam Formation (facies class 5).
Published: 01 August 2007
. Seismic facies are numbered sequentially. All wells except C1 are at platform locations where seismic data are not good quality because of undershoot acquisition. The tie between top and base Laffan Formation and GR log slightly deteriorates at these locations. Oil production rate from the Mishrif
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—Position of Khatiyah Formation within middle Cretaceous Wasia Group in northeastern Arabia (L = Laffan Formation). (A gamma ray-neutron survey.)
Published: 01 May 1985
Figure 3 —Position of Khatiyah Formation within middle Cretaceous Wasia Group in northeastern Arabia (L = Laffan Formation). (A gamma ray-neutron survey.)
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(a) Uninterpreted Northwest-Southeast seismic cross-section of the field. (b) Interpreted Northwest-Southeast seismic cross-section of the field showing stratigraphic units including Simsima reservoir and main faults. Also shown is the location of Well X-31. Note the structural growth started during Late Cretaceous time. The deformation continued throughout the deposition of the Laffan, Halul and Fiqa formations resulting in marked thickness variation and progressive onlap geometry onto the underlying Shilaif Formation. The unconformity at the base of Simsima Formation seems to be less severe than the erosion at the base of Laffan Formation.
Published: 01 April 2011
started during Late Cretaceous time. The deformation continued throughout the deposition of the Laffan, Halul and Fiqa formations resulting in marked thickness variation and progressive onlap geometry onto the underlying Shilaif Formation. The unconformity at the base of Simsima Formation seems to be less
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—Schematic diagram showing flexural evolution of northern Oman Mountain foreland. See text for detailed discussion. ACL = attenuated continental lithosphere, AP = accretionary prism, FIQA = Fiqa Formation, HA = Halul Formation, LF = Laffan Formation, MI = Mishrif Formation, MD = Mauddud Formation, MU = Muti Formation, NU = Nahr Umr Formation, OCL = older continental lithosphere, OL = oceanic lithosphere, SH = Shilaif Formation, and SI = Simsima Formation.
Published: 01 July 1988
Figure 8 —Schematic diagram showing flexural evolution of northern Oman Mountain foreland. See text for detailed discussion. ACL = attenuated continental lithosphere, AP = accretionary prism, FIQA = Fiqa Formation, HA = Halul Formation, LF = Laffan Formation, MI = Mishrif Formation, MD = Mauddud
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Plots of variation of crestal structural relief (i.e. fold uplift) (a), half-wavelength (b), fold core area (c), and fold shortening (d) v. time for the Dorood anticline, constructed in a similar manner to those of the Masaferro et al. (1999) analysis, derived from measurements taken in the flexural slip restoration. The ages of the intra-stratigraphic formation horizons have been interpolated so that the function that shows the variation of crestal structural relief v. time has a constant slope between formation boundaries. Although it is likely that the unconformities within the Gurpi–Ilam–Laffan formations separate periods of different fold amplification rates, they are not reflected in the graphs because no accurate ages for these unconformities are available. The interrupted portions of the functions correspond to hiatuses. Only the unconformities that involve hiatuses or truncated beds are shown, using wavy lines.
Published: 01 January 2011
within the Gurpi–Ilam–Laffan formations separate periods of different fold amplification rates, they are not reflected in the graphs because no accurate ages for these unconformities are available. The interrupted portions of the functions correspond to hiatuses. Only the unconformities that involve
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Plots of variation of crestal structural relief (i.e. fold uplift) (a), half-wavelength (b), and fold core area (c) v. time for the Dorood anticline, constructed in a similar manner to those of the Masaferro et al. (1999) analysis, derived from measurements taken in the vertical shear restoration. The ages of the intra-stratigraphic formation horizons have been interpolated so that the function that shows the variation of crestal structural relief v. time has a constant slope between formation boundaries. Although it is likely that the unconformities within the Gurpi–Ilam–Laffan formations separate periods of different fold amplification rates, they are not reflected in the graphs because no accurate ages for these unconformities are available. The interrupted portions of the functions correspond to hiatuses. Only the unconformities that involve hiatuses or truncated beds are shown, using wavy lines.
Published: 01 January 2011
Laffan formations separate periods of different fold amplification rates, they are not reflected in the graphs because no accurate ages for these unconformities are available. The interrupted portions of the functions correspond to hiatuses. Only the unconformities that involve hiatuses or truncated beds
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Effect of geologic formation (i.e., Ilam, Sarvak, Laffan, Gadvan, and Fahliyan) on pore pressure coefficients of P- and S-wave velocities (γpu and γsu): (a and d) static undrained bulk modulus, (b and e) static Young’s modulus, and (c and f) static Biot’s coefficients. Color dots indicate the geologic formation. Based on these graphs only, one can hardly identify a relationship between geologic formation and pore pressure detectability.
Published: 10 October 2023
Figure 8. Effect of geologic formation (i.e., Ilam, Sarvak, Laffan, Gadvan, and Fahliyan) on pore pressure coefficients of P- and S-wave velocities ( γ pu and γ su ): (a and d) static undrained bulk modulus, (b and e) static Young’s modulus, and (c and f) static Biot’s
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Results of P-RPT validation using blind data obtained from seismic inversion in the Laffan (shale) and Sarvak (limestone) Formations. The studied intervals of the Laffan and Sarvak Formations were saturated with brine and oil, respectively. The colored and white symbols identify the lithology and fluid content, respectively.
Published: 06 June 2024
Figure 13. Results of P-RPT validation using blind data obtained from seismic inversion in the Laffan (shale) and Sarvak (limestone) Formations. The studied intervals of the Laffan and Sarvak Formations were saturated with brine and oil, respectively. The colored and white symbols identify
Journal Article
Published: 01 January 2011
Journal of the Geological Society (2011) 168 (1): 219–234.
... within the Gurpi–Ilam–Laffan formations separate periods of different fold amplification rates, they are not reflected in the graphs because no accurate ages for these unconformities are available. The interrupted portions of the functions correspond to hiatuses. Only the unconformities that involve...
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Journal Article
Published: 01 February 2006
Petroleum Geoscience (2006) 12 (1): 59–68.
... in the Zagros) overlain by rudist-rich limestones (packstones and grainstones) of the Mishrif Formation (Upper Cenomanian–Turonian; Sarvak in the Zagros) ( Fig. 2 ). An unconformity forms a boundary between this succession and the overlying deep-marine shales of the Laffan Formation ( James & Wynd 1965...
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Journal Article
Journal: AAPG Bulletin
Published: 01 October 1988
AAPG Bulletin (1988) 72 (10): 1143–1159.
... removed the Mishrif from the crest of the field. The productive Mishrif thus encircles the structure and consists of porous and permeable grainstones and packstones. The Laffan shale, which transgressed over the Mishrif, forms the reservoir seals. The basinal Khatiyah Formation is primarily organic-rich...
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—Cross section of Umm Al Dalkh field of Abu Dhabi showing the relationship between the Mishrif reef facies as reservoirs, Shilaif Formation as source, and Laffan as seal.
Published: 01 April 1995
Figure 8 —Cross section of Umm Al Dalkh field of Abu Dhabi showing the relationship between the Mishrif reef facies as reservoirs, Shilaif Formation as source, and Laffan as seal.
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Stratigraphic column of study area and position of Sarvak, Laffan and Ilam Formation in sedimentary sequence; Sarvak Formation (upper Albian to upper Turonian) includes strong shallow marine limestone with thin intraclast spaces of upward stacking marl and mass cut-in limestone. The Lafan shale has been deposited as surface unconformity and as an effective area part for Sarvak reservoir.
Published: 01 October 2018
Fig.1. Stratigraphic column of study area and position of Sarvak, Laffan and Ilam Formation in sedimentary sequence; Sarvak Formation (upper Albian to upper Turonian) includes strong shallow marine limestone with thin intraclast spaces of upward stacking marl and mass cut-in limestone. The Lafan
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Chronostratigraphy of the Late Cretaceous in the Middle East region (after Sharland et al. 2001). The studied interval extends from the Turonian unconformity at the top of the Mishrif Formation through the Laffan and Ilam formations and correlates with the lower part of the Arabian Plate megasequence 9 (AP9). Deposition of the two latter formations corresponds to two third-order maximum flooding surfaces (MFS K150 and K160) and continuous deepening of the depositional basin occurred in the study area.
Published: 01 August 2007
Fig. 2 Chronostratigraphy of the Late Cretaceous in the Middle East region (after Sharland et al . 2001 ). The studied interval extends from the Turonian unconformity at the top of the Mishrif Formation through the Laffan and Ilam formations and correlates with the lower part of the Arabian
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An example of the application of a pore pressure feasibility study template on some geologic formations in the Zagros sedimentary basin. The values on both axes are estimated from well-log data upon resampling to 1 m. Results showed that the Laffan shale exhibits good pore pressure detectability from sonic data, followed by marly limestone (Gurpi), dense limestone (Darian), and deeply buried limestone/dolomite (Kangan).
Published: 10 October 2023
Figure 13. An example of the application of a pore pressure feasibility study template on some geologic formations in the Zagros sedimentary basin. The values on both axes are estimated from well-log data upon resampling to 1 m. Results showed that the Laffan shale exhibits good pore pressure
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Ca-Fe-Mn (mol %) ternary diagram, showing bulk-rock compositions of garnet-rich rocks from the southern Curnamona Province. Data from 1Laffan (1994), 2Plimer (2006) and Evans (2002). Abbreviations: amp = amphibole, BHT = Broken Hill-type, BIF = banded iron formation, Gah = gahnite. Other mineral abbreviations after Kretz (1983).
Published: 01 August 2009
F ig . 5. Ca-Fe-Mn (mol %) ternary diagram, showing bulk-rock compositions of garnet-rich rocks from the southern Curnamona Province. Data from 1 Laffan (1994) , 2 Plimer (2006) and Evans (2002) . Abbreviations: amp = amphibole, BHT = Broken Hill-type, BIF = banded iron formation, Gah
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The study interval in well E1 (location in Fig. 1). Gamma-ray, porosity log and available core description information are shown. Intense dissolution at the top Mishrif Formation corresponds to the Turonian erosional surface. A high gamma-ray response indicates drowning of this surface beneath deep-water Laffan marls that pass up into the argillaceous limestones of the Ilam Formation. At least three gamma-ray-derived coarsening/fining sequences are observed within the studied interval. Fossils indicate a transition from neritic to pelagic dominance towards the top of the interval.
Published: 01 August 2007
beneath deep-water Laffan marls that pass up into the argillaceous limestones of the Ilam Formation. At least three gamma-ray-derived coarsening/fining sequences are observed within the studied interval. Fossils indicate a transition from neritic to pelagic dominance towards the top of the interval.
Journal Article
Journal: Geophysics
Published: 06 June 2024
Geophysics (2024) 89 (4): IM31–IM40.
...Figure 13. Results of P-RPT validation using blind data obtained from seismic inversion in the Laffan (shale) and Sarvak (limestone) Formations. The studied intervals of the Laffan and Sarvak Formations were saturated with brine and oil, respectively. The colored and white symbols identify...
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Journal Article
Journal: AAPG Bulletin
Published: 01 May 1985
AAPG Bulletin (1985) 69 (5): 809–812.
...Figure 3 —Position of Khatiyah Formation within middle Cretaceous Wasia Group in northeastern Arabia (L = Laffan Formation). (A gamma ray-neutron survey.) ...
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