Facies analysis and stratigraphic development of the Albian Succession in Nasiriyah Oil Field, Southern Iraq

Al-Zaidy, Aiad Ali Hussien; Khudhair, Marwah H.

doi:10.22161/ijaers.5.1.8

Cited by 6 publications

(4 citation statements)

References 5 publications

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“…However, the green algae and red algae are not recognized as a well‐diversified group, which infers a low sea‐level and decreasing temperature during deposition of Kazhdumi Formation (Aguirre & Riding, 2005). Based on Al‐Haj et al (2016), this lithofacies is assigned to coast through reef front palaeoenvironment, whereas Al‐Ziady and Kudhair (2013) determined similar data facies as a shallow open marine environment. Al Mafraji and Al‐Ziady (2019) documented similar data as open marine conditions.…”

Section: Facies Analysismentioning

confidence: 97%

Larger benthic and planktonic biostratigraphy and facies of Albian sediments in Coastal Fars Zone (Zagros area, south‐west Iran)

et al. 2021

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A total of 64 samples were collected from the Kazhdumi Formation (Albian) of south Zagros Basin (Coastal Fars Zone) in order to study the biostratigraphy and analyse the lithofacies. Stratigraphic distribution of identified larger benthic and planktonic foraminifers has confirmed the presence of three successive biozones: Mesorbitolina subconcava‐Orbitolina discoidea Zone, Favusella washitensis Zone followed by an upper Conicorbitolina conica‐Mesorbitolina parva Zone. Generally, orbitolinids are well developed in the Albian succession in the studied section, whereas the stratigraphic distribution of planktonic foraminifers is more restricted, dominating the Favusella washitensis Zone. Nevertheless, microscopic investigation recognizes five microfacies consisting of extraclast‐foraminifer packstone, peloid‐intraclast Orbitolina wackestone, foraminiferal plankton wackestone, intraclast‐Orbitolina grainstone, and coral‐rudist wackestone, which indicated a shallow water carbonates palaeoenvironment (intertidal, lagoon, bar) and open marine. The alternation of both planktic and benthic foraminifera through the Kazhdumi Formation confirms a rapid transgression and regression in the studied section during Albian time, which is attributed to Kazerun basement fault behaviour in the mentioned time interval.

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Section: Facies Analysismentioning

confidence: 97%

Larger benthic and planktonic biostratigraphy and facies of Albian sediments in Coastal Fars Zone (Zagros area, south‐west Iran)

et al. 2021

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“…The Mishrif formation is a bit of a secondform regulation trajectory of Arabian massive gradation, which is identified as (AP8) [42,43]. Albian era to the initial Turonian represents the sequence of the Mishrif Formation, which represents 95 to 89 million years ago, starting from late Cenomanian to early Turonian [44,45] Fig. 4.…”

Section: Depositional Environmentsmentioning

confidence: 99%

Effect of Heterogeneity on Recovery Factor for Carbonate Reservoirs. A Case Study for Mishrif Formation in West Qurna Oilfield, Southern Iraq

Al-Dujaili,

Shabani,

S. AL-Jawad

2023

IJCPE

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Oil recovery could be impacted by the relation between vertical permeability (Kv) and horizontal permeability (Kh) (Kv/Kh). 4816 plugs that have been getting hold of 18 wells of Mishrif formation in the West Qurna oilfield were used. Kv/Kh data provided some scatter, but the mean is ~1. Kv/Kh =1 was used for the Petrel model before upscaling according to the heterogeneity of each layer. Kv/Kh values for Mishrif Formation in West Qurna Oilfield are 0.8 for relatively homogeneous, 0.4 for heterogeneous rock, and 0.1 for cap rocks (CRII). Eclipse TM was used for reservoir simulation. PVT and SCAL data enhanced the simulation process. The results showed that the reduction of Kv/Kh to 0.9 for the mA unit would reduce the recovery factor (RF) by ~0.9% and continuing lowering would reduce RF more, while the same reduction would reduce RF by ~1% in the mB1 unit. The reduction would be 0.8, which increases RF by ~0.5% for the mB2U unit, while there was no effect on RF in the CRII unit whatever the reductions.

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“…This cross plot is important in providing a satisfactory resolution of quartz, calcite, and dolomite minerals. In addition, this plot can be used to analyze the most common evaporate minerals that are easily identified [9]. Density-neutron cross plot of Shuaiba Formation shows points that are occurring in the dolomite field, with small ones found in the limestone and shale fields.…”

Section: -2-1 Density-neutron Cross Plot For Lithology Identificationmentioning

confidence: 99%

Petrophysical Properties and Digenetic Evolution of Shuaiba Formation in Nasiriyah Oil Field, Southern Iraq

Khudhair¹

2021

eijs

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Shuaiba Formation is a carbonate succession deposited within Aptian Sequences. This research deals with the petrophysical and reservoir characterizations characteristics of the interval of interest in five wells of the Nasiriyah oil field. The petrophysical properties were determined by using different types of well logs, such as electric logs (LLS, LLD, MFSL), porosity logs (neutron, density, sonic), as well as gamma ray log. The studied sequence was mostly affected by dolomitization, which changed the lithology of the formation to dolostone and enhanced the secondary porosity that replaced the primary porosity. Depending on gamma ray log response and the shale volume, the formation is classified into three zones. These zones are A, B, and C, each can be split into three rock intervals in respect to the bulk porosity measurements. The resulted porosity intervals are: (I) High to medium effective porosity, (II) High to medium inactive porosity, and (III) Low or non-porosity intervals. In relevance to porosity, resistivity, and water saturation points of view, there are two main reservoir horizon intervals within Shuaiba Formation. Both horizons appear in the middle part of the formation, being located within the wells Ns-1, 2, and 3. These intervals are attributed to high to medium effective porosity, low shale content, and high values of the deep resistivity logs. The second horizon appears clearly in Ns-2 well only.

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Facies analysis and stratigraphic development of the Albian Succession in Nasiriyah Oil Field, Southern Iraq

Abstract: Abstract-

Cited by 6 publications

References 5 publications

Larger benthic and planktonic biostratigraphy and facies of Albian sediments in Coastal Fars Zone (Zagros area, south‐west Iran)

Larger benthic and planktonic biostratigraphy and facies of Albian sediments in Coastal Fars Zone (Zagros area, south‐west Iran)

Effect of Heterogeneity on Recovery Factor for Carbonate Reservoirs. A Case Study for Mishrif Formation in West Qurna Oilfield, Southern Iraq

Petrophysical Properties and Digenetic Evolution of Shuaiba Formation in Nasiriyah Oil Field, Southern Iraq

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