3D Geological Modeling for Yamama Reservoir in Subba, Luhias and Ratawi Oil Fields, South of Iraq

ALhakeem, Naseem Sh.; Nasser, Medhat E.; Al-Sharaa, Ghazi H.

doi:10.24996/ijs.2019.60.5.12

Cited by 4 publications

(2 citation statements)

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“…The argillaceous lime mudstone is mainly involved f dark silty shale and higher components of clay minerals; the lime mudstone microfacies transfer into terrigenous lime mudstone, including fine grains of sand in silt size. This microfacies indicate an open-restricted lagoon Environment and shallow open marine [9]. This sub-microfacies is matching to the RMF 16, which is FZ3 based on [22,23].…”

Section: Argillaceous Lime Mudstone Submicrofaciessupporting

confidence: 63%

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Facies Architecture And Depositional Marine Systems of the Yamama Formation in Selected Wells, Southern Iraq

Mohsin

Mohammed²,

Alnajm³

2023

Iraqi Journal of Science

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The Yamama Formation is characterized by a wide geographic extension of southern Iraq. Microfacies analysis of this formation was studied in six wells distributed in six fields: Fayhaa, Sindbad, Siba, Zubair, Ratawi and West Qurna. This research aims to determine paleoenvironments by diagnosing biofacies and lithofacies. Miscellaneous marine fauna of foraminifera and calcareous algae, mainly green algae (dasycladacean.) and skeletal bioclasts from gastropods, pelecypods, bryozoans, sponge spicules, and echinoderms were found. Petrographic studies and well logs interpretations led to the identification of five main Microfacies ( Mudstone, Wackestone, Packestone, Grainestone and Rudstone and twelve submicrofacies (Foraminiferal-Lime mudstone submicrofacies, Argillaceous Lime Mudstone submicrofacies, Planktonic foraminiferal – Lime Wackestone submicrofacies, piculites/ Calcisphers – Lime Wackstone submicrofacies, Benthonic Foraminiferal -Lime wackestone/packestone submicrofacies, Algal (desycladecan) Lime wackestone submicrofacies, Algal-Lime packestone submicrofacies, Bioclastic/ Algal-Lime packestone submicrofacies, Algal/ Foraminiferal- Algal -Lime packstone submicrofacies, Peloidal poorly sorted grainstone with bioclasts submicrofacies, Intraclastic grainstone submicrofacies, Pesudo oolitic-Lithocodium aggregatum grainstone submicrofacies and finally Peloidal-intraclastic, and bioclastic grainstone submicrofacies). Microfacies are deposited in the lagoon, shoal, rudist biostrome and open marine gradient to middle and outer ramp environments. Vertical changes in microfacies with depth were reflected by lateral changes in marine depositional systems and the thickness of the formation. Shoal environments' microfacies are characterized by high thickness, while low thickness characterizes the open marine microfacies. The Yamama Formation was deposited on the low-angle homoclinic carbonate ramp, mainly in the inner and middle ramp, with outer ramp conditions in some parts of the formation.

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Section: Argillaceous Lime Mudstone Submicrofaciessupporting

confidence: 63%

“…The Yamama-Sulaiy succession is deposited in a shallow ramp dipping gently towards the east [6,7]. The Yamama Formation included five depositional environments: Mid-ramp and Inner-ramp (open and restricted marine, shoal and lagoon [8,9,10]. It was deposited during the Berriasian-Valanginan [11,12,13].…”

Section: -Introductionmentioning

confidence: 99%

Facies Architecture And Depositional Marine Systems of the Yamama Formation in Selected Wells, Southern Iraq

Mohsin

Mohammed²,

Alnajm³

2023

Iraqi Journal of Science

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Formation evaluation and reservoir quality assessment of the Albian clastic sequence in the SWM Oilfield, Southwest the Mesopotamian Basin, Iraq

Ashoor

Nabawy

Kamel

2022

J Petrol Explor Prod Technol

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This work intends to delineate the petrophysical properties and the reservoir quality of the Albian sequence in the Mesopotamian Basin which has been deposited as a siliciclastic sequence. The well log data (including the caliper, gamma-ray, density, photoelectric factor 'PEF', neutron, sonic, and resistivity logs), derived from eight wells in the SWM (Southwest Mesopotamian) Oilfield, was studied and interpreted using the appropriate software (IP3.6). These borehole data indicate the necessity to divide the sequence into five reservoir rock units (U1, U2, M, L1, and L2 units). This enabled depicting the porosity, shale volume, water saturation, and net-pay thickness in the vertical and horizontal directions. It is indicated that the M and L1 units are the most promising units with good to very good porosity (∅ ≥ 17.2%), low water saturation (Sw ≤ 28.0%), and acceptable shale volume (Vsh ≤ 8.4%). The net-pay thickness varies between 32.8 and 77.4 m in the different wells of the SWM Oilfield. The well log data were supported by more detailed conventional core data including porosity (∅He) and permeability (k), from which the reservoir quality parameters were estimated precisely. In the present study, reservoir quality assessment based on conventional core data is considered for the first time for evaluating and discriminating the Albian–Aptian sequence in the Southwest Mesopotamian field into reservoir zones and hydraulic flow units. The estimated reservoir parameters include the Flow Zone Indicator (FZI), the Reservoir Quality Index (RQI), and the effective pore radius (R35). Based on the available core data and the estimated reservoir quality parameters, the studied sequence was divided into three reservoir rock types (RRT1–3). The best petrophysical properties have been assigned for the medium-grained sandstone of the RRT1 that dominates in the L1 and the M units (av. ∅He = 23.0%, av. k = 1581 mD, av. R35 = 23.7 μm, av. FZI = 7.368 μm, and av. RQI = 2.304 μm). On the other side, the fine-grained sandstone of the RRT3 is characterized by the lowest petrophysical properties and reservoir quality parameters (av. ∅He = 17.1%, av. k = 5.49 mD, av. R35 = 0.92 μm, av. FZI = 0.603 μm, and av. RQI = 0.136 μm). The integration between the well log and core data of the studied Albian sequence stated that the M and L1 units are the most promising reservoir units. They are predominated by medium-grained and fine to medium-grained sandstones of the RRT1 and the RRT2, respectively. This well log-core data integration is applicable to the different oilfields in the different fields in the Mesopotamian Basin and other basins in south Iraq and elsewhere.

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Classification of the Zubair Subzone oilfields using structural contour maps, Southern Iraq

Al-Kaabi

Hantoosh

Neamah³

et al. 2023

Journal of African Earth Sciences

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3D Geological Modeling for Yamama Reservoir in Subba, Luhias and Ratawi Oil Fields, South of Iraq

Cited by 4 publications

References 1 publication

Facies Architecture And Depositional Marine Systems of the Yamama Formation in Selected Wells, Southern Iraq

Facies Architecture And Depositional Marine Systems of the Yamama Formation in Selected Wells, Southern Iraq

Formation evaluation and reservoir quality assessment of the Albian clastic sequence in the SWM Oilfield, Southwest the Mesopotamian Basin, Iraq

Classification of the Zubair Subzone oilfields using structural contour maps, Southern Iraq

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