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Second EAGE Workshop on Arabian Plate Geology
- Conference date: 24 Jan 2010 - 27 Jan 2010
- Location: Abu Dhabi, United Arab Emirates
- ISBN: 978-94-6282-057-9
- Published: 24 January 2010
21 - 40 of 44 results
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Fracture-controlled Dolomite Reservoirs in Late Cretaceous Carbonates of the Sarvak Formation, Anaran Anticline, Islamic Republic of Iran
Authors F. Lapponi, R. Swennen, G. Casini, A. Amilibia Cabeza, T. Needham, J. Garland, W. Blendingen, P. Gillespie, I. Sharp, D. Hunt and T.L. ScarrottLate burial dolomite of hydrothermal origin replaces Cretaceous carbonate shelf sediments of Albian to Turonian age (Sarvak Formation) in the NW closure of the Anaran Anticline, Zagros Mountains, Simply Folded Belt, Iran. The outcrops, spectacularly exposed along deep river canyons, offer the possibility for a 3D reconstruction of the geobodies, combining both field data (sedimentary logs, cross sections and samples for diagenetic and petrophysical studies) and LIDAR derived photorealistic model of the most representative dolomite bodies. The aim is to quantify the impact of hydrothermal dolomitisation on the reservoir quality. The hydrothermal origin of the dolomitising fluids will be discussed integrating different geochemical data (fluid inclusions, stable and radiogenic isotopes, minor and trace elements). Dolomite replaces carbonate rocks characterised by different facies, showing different geometries: 1) massive plus stratabound (Lower Sarvak); 2) pipes (Upper Sarvak). Dolomite distribution decreases vertically with at least three discrete breaks corresponding to two main aquitard intervals: 1) Ahmadi Shales, separating massive dolomite form from plume-like bodies; 2) Turonian Mudstones; 3) Surgah Fm., above, which no dolomite has been observed. Fractures and faults play a major role in controlling the distribution of the dolomite bodies, in particular the ENE-WSW and WNW-ESE conjugate fault systems, which are often associated with dolomitic halos. A geological conceptual model is built taking into account different fracture and matrix porosity models for limestone and dolomite.
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Fault & Fracture Development in Foreland Fold and Thrust Belts - Insight from the Lurestan Province, Zagros Mountains, Iran
Authors G. Casini, J. Verges, I. Romaire, N. Fernandez, E. Casciello, S. Homke, E. Saura, J.C. Embry, D.W. Hunt, P. Gillespie, L. Aghajari, H. Noroozi, M. Sedigh and J. BagheriSummary not available
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Detection and Distribution of Thief Perm in the Late Albian Mauddud Formation, Sabiriyah and Raudhatain Fields, Kuwait: A Dual Porosity Dual Permeability Methodology for Model Implementation
Authors H. El Din Ibrahim, M.F. Al-Ajmi, E. Al-Anzi, M. May, A. Quinn, L. Brinton, J. Keay, J. Kalbus, J. Dozzo and M. FahadAn integrated analysis of a detailed core description, image and open-hole logs, PLT and PTA data, and production history in the late Albian (Early Cretaceous) Mauddud formation of Sabiriyah and Raudhatain fields, North Kuwait reveal the presence of dual perm dual porosity carbonate reservoirs. A methodology was developed to distribute this secondary pore system within the dynamic model and achieve an excellent history match. Early water breakthrough within months of water injection in this high porosity/low permeability reservoir indicated the likely presence of a secondary high perm low volume pore system or "Thief". A thief zone facies log was created and derived from core interpretation, foot by foot PLT spike and permeability logs, well test permeabilities, and high flow production zones. Both object and pixel based descriptions were considered for the history match. It is likely that a high quality history match could be achieved from either description. However, model results indicated a preference for the pixel based more continuous thief zone case. The thief description was iteratively modified during the history matching process as the well performance data provides vital information about thief continuity.
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A Transition from a Passive to a Tectonically Active Margin and Foreland Basin Development in the Late Cretaceous of the Fars Area and Offshore (Zagros)
Authors A.R. Piryaei, J. Reijmer, J. Borgomano and F.S.P. van BuchemThe northeastern margin of the Arabian plate in the Fars Area was influenced by a series of tectono-sedimentary events during the Late Cretaceous. These events are well documented by significant variations in sedimentary facies and sedimentation patterns and thickness. The presence of igneous dikes is another significant phenomenon at the top of Cenomanian platform. Nine regional transects parallel and perpendicular to the Zagros trend were prepared. These transects vertically contain three tectono-sedimentary phases: Phase I (Late Albian to Turonian), Phase II (Coniacian to Late Campanian) and Phase III (Late Campanian to Maastrichtian). Phase I is characterised by shallow-water carbonate platforms bordering intrashelf basins. Eustatic sea-level variations can be the main factor controlling the accommodation space in parts of the area, whereas to the southeast the role of the regional and salt tectonic are more dominant. Phase II is marked by major changes in the depositional environments and sedimentary facies, as a result of obduction and foreland basin creation. The pelagic marls host large volumes of carbonate and siliciclastic gravity flows and far-traveled radiolarites and ophiolites as well as thrust slices of older carbonates. Phase III is dominated by pelagic facies interfingering with shallow-water Omphalocyclus and Loftusia-bearing facies.
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Sequence Stratigraphy of the Albian to Cenomanian Interval in the Northwest Fars Area (Southwest Iran)
Authors H. Asilian, Y. Lasemi, D. Morsalnejad, M. Jalali and A. Khosravi-SereshkiThe Albian to Turonian sediments, are over 600 meters thick in the study area consisting mainly of shallow-water carbonates. In total five surface sections were measured in the Coastal and sub-Coastal Fars then correlated with eleven wells. The datasets are organised in 3 SE-NW and SW-NE oriented transects. Facies analysis let to recognise a range of tidal flat to open marine sedimentary environments. The sedimentary facies consists of stromatolite, rudist debris, oligosteginid and other planktonic foraminifera in mudstone to boundstone sedimentary textures. Six 3rd order sedimentary sequences were distinguished in this time interval. Lateral facies and thickness changes introduce local and regional controls on the sedimentation patterns. The regional factors could be related to the Cenomanian/Turonian uplift and erosion that creates patchy natures in these units, while the local factors are attributed to the salt movements and influence of the well known Kazerun and Nezam Abad faults. The overall thickness changes show that the depocentre locates between these two faults in the sub coastal Fars area.
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The Albo-Cenomanian in the Middle-East - New Element for Carbonate Platform Stratigraphy
By P.J.L MasseIn Middle-east, the albo-cenomanian comprises a prolific lithostratigraphic nomenclature. In-house studies on subsurface and outcrops sections lead Total biostratigraphers to use foraminifers charts for datings and paleoenvironments definition. Calibration on Ammonites zones is possible in the Late Albian-Early Cenomanian and Mid Cenomanian of Oman. Further work of biostratigraphers could focus on a characterization of the "top Natih" or "top Mishrif" carbonate platform with foraminiferal assemblages located at formation top and a research of new sections at platform-basin transition. This will help in the evaluation of the degree of truncation of the “Mishrif/Natih” formations below the turonian-coniacian unconformity.
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Constraints on Regional-Scale Stratigraphic Forward Modelling in the Upper Sarvak Formation, Lurestan, Iran
Authors J.C. Embry, D. Hunt, I. Sharp, G. Casini, S. Homke, T.L. Scarrott and M.R. JamalediniSummary not available
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Eustasy and Tectonic Controls on the Sedimentary Patterns in the Albian-Cenomanian Succession in the Lurestan (Zagros)
Authors A. M. Jamali and M.A. KavoosiThe Upper Albian-Turonian deposits in the Lurestan Area are attributed to the Sarvak Formation.Field observations and facies analysis indicate absence and presence of quartz grains and calciturbidites respectively which reflect the different tectonic regimes.Sudden establishment of Upper Cenomanian pyritic and glauconitic pelagic and hemipelagic facies containing packed ammonite even on the top of paleohighs, most propably suggest drowning of carbonate platform in the study area during late Cenomanian.
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Carbonate Platform High-Frequency Cycles, Natih Sequence I (E Member), Sultanate of Oman: Constrasting Transgressive & Regressive Constrained Reservoir Scale Heterogeneities
Authors P.W. Homewood, M. Mettraux, C. Grelaud, P. Razin and V. VahrenkampThick, apparently layer-cake, proximal carbonate platform deposits of the Natih Formation (Late Albian - Early Turonian) show stratigraphic heterogeneity that differs between transgressive and regressive stacking patterns of high frequency cycles. In Natih Sequence I (E member), stylolite-seamed mudstones to wackestones of deepening half-cycles form permeability barriers in landward stepping configurations, as do the dolomitised, early-cemented bed tops of progradational half cycles in seaward stepping mode. These laterally extensive permeability barriers, spaced at 1m to 10m intervals, should be taken into account when putting together models for fluid flow in similar thick "homogenous" reservoirs.
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Reservoir Characterization of Emersion Surfaces and their Associated Diagenesis - Natih Formation, Cretaceous, Sultanate of Oman
Authors J. Champagne, C. Durlet, C. Grelaud, P. Razin and S. SchroederThe characterization of emersion surfaces in carbonates and their associated diagenesis could provide helpful tools for reservoir studies. Outcrops observations combinated with data from oil fields should lead to predictive models of reservoir properties associated with emersion surfaces. The Natih Formation constitutes the top of a thick succession of Cretaceous epeiric platform deposits. It is subdivided into three 3rd order sequences. These sequences are frequently capped by emersive horizons, which could be associated with incisions. Detailed studies of the lateral distribution and chronology of diagenetic phases associated with emersion surfaces form the basis for the sedimentological and diagenetic model. The results emphasize the heterogeneous character of these surfaces from a microscopic to a regional scale. The diagenetic sequence and the characterization of fluids associated with petrophysical data constrain the modifications of reservoir quality, in relation with the geological context. The complex interplays between the factors responsible for reservoirs properties could make difficult the recognition of exposure surfaces. That is why an integrated approach is needed to find predictable patterns for the detection of unconformities in carbonates.
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Albian-Turonian Carbonate Ramp and Platform Evolution in the Al Shaheen Field, Offshore Qatar
Authors F. Maurer, F. van Buchem, R. Lang, E. Hoch, M. Emang, N. Bounoua and K. HabibIn offshore Qatar two sedimentary systems are distinguished in the Albian to Turonian interval. The stratigraphically older one comprises a low angle mixed marl/carbonate ramp system, corresponding to the Nahr Umr Formation and the lower part of the Mauddud Formation developed during the Albian. This ramp system is overlain by a carbonate platform to intrashelf basin system, corresponding to the upper part of the Mauddud and the Khatiyah Formations, of Cenomanian-Turonian age. The geometry and facies of the two systems are presented using data from core, thin sections, 3D seismic and age dating.
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Regional Sequence Stratigraphic Correlation of the Burgan and Mauddud Formations (Lower Cretaceous), Kuwait
A new sequence-stratigraphic framework is proposed for the Burgan and Mauddud formations (Albian) of Kuwait, where together form two third-order composite sequences, the older of which constitutes the lowstand, transgressive, and highstand sequence sets of the siliciclastic Burgan. subdivided into fifteen, high-frequency, depositional sequences, Overlain by Mauddud of sand-mud prone to the south and carbonate prone to the north with its transgressive and highstand sequence sets, subdivided into eight, high-frequency, depositional sequences at time-transgressive contact with each other.
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High-Resolution Lithofacies Analyses of Predominantly Organic-Rich Carbonates from the Natih-B Intrashelf Basin, North Oman
Authors S.A.K. Al Balushi, J.H.S. Macquaker and C. HollisRecent research, utilizing high-resolution petrographic and geochemical analyses on samples collected from North Oman, has revealed that the predominantly fine-grained carbonates of the Natih-B Member contain a great deal of previously unrecognized lithofacies variability, developed at cm to sub-mm scales. Most geologists have largely overlooked the significance of this small-scale variability, attributing changes observed to either influence of varying primary production or oxygen concentration in the water column. Detailed analyses of the textures (e.g., relict thin beds, burrow mottles, organo-mineralic aggregates and lenticular laminae) and components (including fossil and mineral assemblages) present at these small scales suggest that this lithofacies variability reflects bed-scale processes. Moreover, it indicates that many of the Natih-B intrashelf-basinal sediments, rather than being deposited directly from suspension settling under predominantly low-energy conditions, were actually deposited, at least partially, by episodic and advective events. These sediments, following compaction, developed thin beds and then were subsequently burrowed by diminutive infauna. Furthermore, analyses of successive samples within laterally-equivalent intervals suggest that there was significant temporal and spatial variability in sediment supply and accommodation availability, in addition to local changes in primary production, sediment accumulation and burial rates that fundamentally controlled organic-matter enrichment in the Natih-B Member.
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