Stratigraphy and Basin Development of the Oligocene-Early Miocene Succession, Southeastern Iraq

Hussien, A A; Aoudah, Hussein Sh.; Al-Tarim, Haider A. Falih

doi:10.24996/ijs.2022.63.7.22

Cited by 2 publications

(2 citation statements)

References 6 publications

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“…The Middle-Late Eocene basin is represented by a transgression stage with high subsidence, where the sea level had been raised and covered the northeastern and eastern parts of the Mesopotamian basin by deep-sea deposits (Jaddala Formation) [17]. This succession was underlying the Oligocene which was described by [18] as marly limestone with planktonic foraminifera in the southeastern part of the Mesopotamian basin center during the transgressive and highstand conditions. Tertiary formations are the most widespread deposit on the surface and in the subsurface section throughout almost all the structural units of Iraq.…”

Section: Stratigraphic Settingmentioning

confidence: 99%

Microfacies analysis and sequence stratigraphy of Oligocene formations within Bai Hassan oil field, Northern Iraq

Kameran,

Tamar-Agha,

Al-Beyati

2023

Iraqi Journal of Science

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Bai Hassan Oil field is considered one of the important north Iraq oil fields. The giant oil field of Bai-Hassan is located near Kirkuk City in North Iraq. The field consists of two domes (in SE – NW direction) Kithka Dome and Dauod Dome separated by a narrow saddle called Shashal saddle. The current study is focused on microfacies analysis to interpret the stratigraphic sequence of the Palani Formation (early – lower Oligocene age), Baba, Bajawan and Tarjil Formations (middle Oligocene age). The Bajawan Formation consists basically of five microfacies easily recognizable throughout the thin section. These microfacies are Lime Mudstone Microfacies, Miliolid Packestone Microfacies, Miliolid Grainstone Microfacies and Dolostone Microfacies. The Baba Formation comprises four microfacies: Rutalia - Nummulites Packstone Microfacies, Coral Boundstone Microfacies and Dolostone Microfacies. Two microfacies have been recognized in Tarjil Formation, these are Lime Mudstone Microfacies and Planktic foraminiferal packstone microfacies. In addition to two microfacies within Palani Formation are Lime Mudstone and Planktonic foraminifera Wackstone Microfacies. The depositional environment of the studied formations and the analysis of their facies components showed that they were deposited within the three parts of the ramp environment, where the Palani Formation was deposited in the deeper part from the outer ramp during TST and HST stages, while the Tarjil Formation was deposited at the distal part of upper slope area from middle ramp environment during HST stage. The Baba Formation was deposited on the swelling parts of the approximal part for the middle ramp at the lower part (TST), and it was reached separately by MFS from the distal part of inner ramp sediments which were deposited during HST as two cycles. The Bajawan Formation with its two parts was deposited at the approximal part from the inner ramp environment during the early and late HST stage.

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Section: Stratigraphic Settingmentioning

confidence: 99%

Microfacies analysis and sequence stratigraphy of Oligocene formations within Bai Hassan oil field, Northern Iraq

Kameran,

Tamar-Agha,

Al-Beyati

2023

Iraqi Journal of Science

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“…Aoudah et al [10] named the Oligocene -Early Miocene Sequence as the Missan Group. These sediments were subdivided into two cycles, where each one is ended by a sequence boundary, equivalent to the lowstand siliciclastic residues in the basin center.…”

Section: Introductionmentioning

confidence: 99%

Depositional Framework and Stratigraphic Sequence of Early – Middle Miocene succession in Balad and East Baghdad oil fields, Central Iraq

AL- Yassery,

Al-Zaidy

2023

Iraqi Journal of Science

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This study deals with microfacies analysis, diagenetic facies, environmental interpretations related to sequence stratigraphy for Early – Middle Miocene in selected wells within Balad (Ba-X) and East Baghdad (EB-Z) oil fields. Seven major microfacies were recognized in the successions of the study wells, these facies were used to recognize six facies association (depositional environments) within the study oil fields: deep marine, toe of slope, open marine, restricted interior platform, evaporitic interior platform and brackish interior platform. The facies associations interpreted were based on texture and obtainable fauna. The Early - Middle Miocene succession was deposited during two depositional cycles as a third order cycle (C1and C2). These cycles are asymmetrical and started with cycle one (C1) which divided into three sub-cycles in Balad oil field. The first (CS1) deep open marine association facies in lower part of Serikagni Formation represents by relatively thin transgressive system tract (TST). This facies overlying by evaporitic interior platform association facies as highstand system tract (HST) within the upper part of Serikagni Formation and bounded by MFS. The second sub - cycle (CE1) is represented by relatively thin transgressive system tract (TST) reflected by restricted interior platform occupies the lower part of Euphrates formation, while middle and upper part occupies by highstand system tract (HST), which represented by evaporitic interior platform facies. At the lower part of Dhiban Formation sub - cycle (CDh1) is started with transgressive system tract (TST) reflected by Evaporitic interior platform overlying by open marine environment which represent the starting of highstand system trac (HST). Cycle two (C2) is almost symmetrical cycle started with transgressive system tract (TST) reflected by restricted interior platform occupies the lower part of Jeribe Formation, while middle and upper part occupied by highstand system tract (HST), which represented by open marine environment. This succession appeared high cyclicity in East Baghdad oil field during the same two major cycles (C1 and C2) with absence of deep open marine association facies (Serikagni Formation). Where C1 cycle is appeared five sub-cycles of HST overlying the TST within Euphrates and Dhiban succession. The second cycle is characterized by three sub-cycles of HST overlying TST sub-cycle within the Jeribe succession. The above gives accurate evidence that the location of the East Baghdad oil field was the closest to the continental part, while the Balad oil field was towards the deep sea. This clearly affected the number of sedimentation cycles and the shallowness of the deposition environment in the East Baghdad field compared to the Balad oil field.

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Stratigraphy and Basin Development of the Oligocene-Early Miocene Succession, Southeastern Iraq

Cited by 2 publications

References 6 publications

Microfacies analysis and sequence stratigraphy of Oligocene formations within Bai Hassan oil field, Northern Iraq

Microfacies analysis and sequence stratigraphy of Oligocene formations within Bai Hassan oil field, Northern Iraq

Depositional Framework and Stratigraphic Sequence of Early – Middle Miocene succession in Balad and East Baghdad oil fields, Central Iraq

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