Facies analysis and geochemistry of the Euphrates Formation in Central Iraq

Al-Dabbas, Moutaz A.; Awadh, Salih Muhammad; Zaid, Ayad Abed

doi:10.1007/s12517-013-0932-3

Cited by 12 publications

(12 citation statements)

References 8 publications

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“…The sedimentology and reservoir properties of clastic sedimentary rocks are depended on the interplaying of tectonic development, sea level changes, rate of sediments supplying, physical and biologic activity, Processes of sediments transportation and sedimentation, and climatic changes. These processes interact at the basin scale to create the geometric arrangement and distribution over time of various sedimentary environments or stratigraphic tracts, known as the stratigraphic architecture of the basin (Miall, 1991, Al-Dabbas et al, 2014. In the Zubair Formation, five lithofacies were defined as follows.…”

Section: Facies Analysismentioning

confidence: 99%

Sequence Stratigraphy and Depositional Environment of the Zubair Formation in Rumaila Oilfields, Southern Iraq: Microfacies and Geochemistry

Alsultan

Awadh

Al-Owaidi

et al. 2021

IGJ

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In the Rumaila oilfields in southern Iraq, the Zubair Formation was deposited in a shallow environment as three main facies, delta plain, backshore, and delta front depositional conditions indicating a transition from delta front and delta plain to a highstand level due to the finning upward mode. The facies of the Zubair clasts show well-sorted quartz arenite sandstone, poorly sorted quartz arenite sandstone, clayey sandstone that has not been properly sorted, sandy shale, and shale lithofacies. The minor lithofacies were identified using well-logging methods (gamma ray, spontaneous potential and sonic logs) and petrography. The Zubair clasts are of transition environment that appears to be transported from freshwater and deposited in a marine environment forming many fourth-order cycles reflect sea level rise fluctuations and still-stand under tectonics developed the sequence stratigraphy. A misalignment between relative sea-level and sediment supply caused asymmetry sedimentary cycles. A shallower environment of shale-dominated rocks rich in organic matter and pyrite were exposed. The basinal shale of Ratawi at the Zubair bottom and the shallow carbonate of Shuaiba emplace on the Zubair represent the beginning of the delta build up (delta front and delta plain) to a highstand stage.

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Section: Facies Analysismentioning

confidence: 99%

Sequence Stratigraphy and Depositional Environment of the Zubair Formation in Rumaila Oilfields, Southern Iraq: Microfacies and Geochemistry

Alsultan

Awadh

Al-Owaidi

et al. 2021

IGJ

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“…Recently [7] suggested another section at Al-Baghdadi area as a reference section, because the type section at wadi Fuhaimi submerged by the Al-Qaddisiyah lack. Ever since, many studies appeared for different aim, including those of; [8]; [9]; [10]; [4]; [11]; [12]; [13]; and off course, [7], [14] detailed all these studies.…”

Section: Previous Studiesmentioning

confidence: 99%

Facies Characteristics, Depositional Environments and Sequences Stratigraphy of the Euphrates Formation in Hadetha Area, Western Iraq

Al-Ghreri¹,

Al-Hetty²,

Al-Gibouri³

2016

JNUS

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The Euphrates Formation (Lower-early middle Miocene) shallow water carbonates, western Iraq was studied in order to determine its microfacies and depositional environment. According to the benthic foraminiferal assemblage along with other skeletal and non-skeletal components, Fourteen microfacies associations types (F1-F14) are recorded and distributed as: Lime mudstone, miliolids wackestone, alveolinids wackestone, echinoids wackestone, bioclastic packstone, peliods packstone, miliolids packstone, peneroplids packstone, rotaliids packstone, miliolids grainstone, peliods grainstone, ooids grainstone, miliolids-peneroplids grainstone, and peneroplids grainstone that were deposited in three facies belts, restricted marine, shoal, and open marine environments. Based on field observations, microfacies analysis and sequence stratigraphic concepts, the Lower Miocene successions is represented by four order cycles (A, B, C and D) they are mostly asymmetrical showing slightly lateral variation in thickness and symmetry. These cycles represent a succession episode of sea level rises and stillstands. The nature of these cycles reflects variation in the relative sea level resulted from eustatic and tectonic subsidence. Cycle A is underlain by Anah Formation, while cycle C is overlain by SB1 Fatha Formation. According to sequence development, the study area shows low rate of subsidence and the major controlling factor that effect is eustatic sea level fluctuation.

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“…The Eu phrates For ma tion in the West ern Desert rep re sent a shal low-marine en vi ron ment, and in the mid dle and north of Iraq it re flects shal low-ma rine, reef and la goonal con di tions (Buday, 1980). The shore line likely was near to Najaf in cen tral Iraq rather than to Baghdadi in the west (Al-Dabbas et al, 2013). Al-Juboury (2009) sug gested the der i va tion of the Injana For ma tion from nearby sources with con tri bu tions from ig ne ous, meta mor phic, and sed i men tary prov e nance mainly in the high lands in the north east ern parts of Iraq which com pris ing mainly the Zagros Moun tains and older sed i men tary rocks.…”

Section: Lithostratigraphy and Depositional Environmentmentioning

confidence: 99%

“…The or ganic C/N atomic ratios serve as use ful in di ca tors in elu ci dat ing the source of sed iment or ganic mat ter (An drews et al,1998;Mul ler and Voss, 1999;Maksymowska et al, 2000). The source, depositional envi ron ment and palaeoenvironment of the Neo gene Eu phra tes, Injana and Dibdibba for ma tions in Iraq have been stud ied by many re search ers (Al-Rawi and Sadik, 1981;Al-Dabbas et al, 2013). These stud ies pro vided con clu sions about the depositional en vi ron ment that broadly concided but were not iden ti cal.…”

Section: Introductionmentioning

confidence: 99%

Stable carbon and nitrogen isotopes and elemental composition and origin of organic matter from the Euphrates, Injana and Dibdibba formations in Iraq: discrimination between marine and terrestrial environments

Awadh

2014

Self Cite

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Awadh, S.M., 2014. Sta ble car bon and ni tro gen iso topes and el e men tal com po si tion and or i gin of or ganic mat ter from the Neo gene Eu phra tes, Injana and Dibdibba for ma tions in Iraq: dis crim i na tion be tween ma rine and ter res trial en vi ron ments. Geo log i cal Quar terly, 58 (4): 729-736, doi: 10.7306/gq.1174 Three Neo gene sed i men tary for ma tions re flect ing dif fer ent depositional en vi ron ments have been in ves ti gated for the purpose of di ag nos ing the iso to pic source of the sed i men tary or ganic mat ter and their palaeoenvironmental sig nif i cance in discrim i nat ing be tween ma rine and ter res trial en vi ron ments. One of these for ma tions is com posed of car bon ate and marl of a shal low-ma rine en vi ron ment (Eu phra tes For ma tion), and the other for ma tions are com posed of a clastic ter res trial (fluviatile) de pos its with some dif fer ences in the depositional con di tions (Injana and Dibdibba for ma tions). The iso to pic d 13 C%, d 15 N% val ues, or ganic car bon (OC) and to tal ni tro gen con tents, and atomic C/N ra tios are used as ev i dence of depositional en vi ronment. Av er age d 13 C val ues (in ‰) for the Dibdiba, Injana and Eu phra tes for ma tions are -25.4, -25.7 and -24.5, re spec tively; av er age d 15 N val ues (in ‰) are 4.44, 5.24 and 7.24 and av er age OC (in wt.%) is 0.13, 0.3 and 1.1, re spec tively. A sig nif i cant vari a tion in the sta ble car bon and ni tro gen iso tope com po si tions be tween flu vial and ma rine de pos its was re corded. The d 13 C, d 15 N and C/N val ues in di cate that the or ganic mat ter in the Eu phra tes For ma tion is of ma rine or i gin, whereas it is of terres trial or i gin (fluviatile) in the Injana and Dibdibba for ma tions. The C/N atomic val ues are mostly high in the Injana (37) and Dibddiba for ma tions (51), sug gest ing greater in put and/or pres er va tion of ter res trial or ganic mat ter de rived from land plants; the shal low-ma rine en vi ron ment (Eu phra tes For ma tion) was char ac ter ized by a low C/N ra tio (9) due to the al gal-de rived organic mat ter with lim ited in put of ter res trial or ganic mat ter.Key words: sta ble car bon iso topes, sta ble ni tro gen iso topes, or ganic mat ter, ma rine en vi ron ment, ter res trial en vi ron ment, palaeoenvironment, Iraq.

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Facies analysis and geochemistry of the Euphrates Formation in Central Iraq

Cited by 12 publications

References 8 publications

Sequence Stratigraphy and Depositional Environment of the Zubair Formation in Rumaila Oilfields, Southern Iraq: Microfacies and Geochemistry

Sequence Stratigraphy and Depositional Environment of the Zubair Formation in Rumaila Oilfields, Southern Iraq: Microfacies and Geochemistry

Facies Characteristics, Depositional Environments and Sequences Stratigraphy of the Euphrates Formation in Hadetha Area, Western Iraq

Stable carbon and nitrogen isotopes and elemental composition and origin of organic matter from the Euphrates, Injana and Dibdibba formations in Iraq: discrimination between marine and terrestrial environments

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