High resolution sequence stratigraphy and petroleum system of Paleozoic sequences in western Iraq

Other Title(s)

طباقية المتتابعات و النظام البترولي لتتابعات الباليوزوك في غرب العراق

Dissertant

al-Shara, Ghazi Hasan Mutlaq

Thesis advisor

al-Jasim, Jasim Ali

Comitee Members

al-Rawi, Diya Yusuf
Kyara, Ali Dawud
al-Jumayli, Sad Salih
al-Shikhli, Sad Sami
Ubayd, Mamun

University

University of Baghdad

Faculty

College of Science

Department

Geology Department

University Country

Iraq

Degree

Ph.D.

Degree Date

2008

English Abstract

The Paleozoic sequences of Iraq are hydrocarbon prospective in the western and southwestern desert and particularly in the western desert adjacent Syria, Jordan and Saudi Arabia.

A Stratigraphic architecture for the Paleozoic of the western and southwestern of Iraq is proposed basal upon different deep wells in the western part of the country , like Akkas-1, key holes KH5/1 , KH5/6 , and Dn-1 , Wk-1 in southwestern desert , recently published data from different wells in adjacent countries , numerous data were collected from many resources in Saudi Arabia, Jordan and Syria , and some data from outcrops in northern of Iraq and other regions of Jordan .

The Paleozoic depositional systems and tectonic setting of the western and southwestern desert, especially during Cambrian, Ordovician and Silurian show marked similarity to those of northern Saudi Arabia and eastern Jordan with some lithological variations which are a result of Caledonian and Hercynian tectonic events.

The same rocks of the petroleum system consist of several potential organic rich shale including the regionally widespread Silurian Akkas hot shale.

The lower Silurian marine hot shale in the Akkas-1 of the western desert, two hot shale horizons have a combined thickness of 64m and total organic carbon values that reach 16% are believed to be the main Paleozoic source rocks in the western and southwestern desert of Iraq.

In addition to potential source rocks in this region could be the black shale of the middle and upper Ordovician Khabour formation , the middle Devonian , upper Devonian to early Carboniferous Ora shale formation and the lower shaly beds of the upper Permian Chiazairi formation.

In the Akkas field sweet oil and gas (no H2S), light oil with specific gravity of 42o API were discovered in the Khabour and Akkas formations respectively.

The main target reservoirs are Ordovician, Silurian, Carboniferous and Permian sequences similar reservoir have recently been reported for the western desert of Iraq, northern Saudi Arabia and eastern Jordan.

The Khabour reservoir potential occurs in the upper Ordovician that consists of fractured sandstones with porosity of up to 7% and permeability of 0.14mD , the Akkas reservoir potential take place in the upper part of the Silurian Akkas formation and consists of sandstones that have a porosity of 6% and permeability of 0.2mD .

Different sequences boundaries supported the reservoir quality , which are mainly the Caledonian tectonic event in the late Silurian system , and the Hercynian tectonic episode which initiated in the early Devonian keep on to late Devonian system , these tectonic events caused partial missing of different sequences in some regions of the study area , and these tectonic regimes are responsible for the improvement of the reservoir quality of some sedimentary units and lead to accumulate a commercial of oil and gas quantities in different reservoir units of Paleozoic depositional systems.

Main Subjects

Earth Sciences, Water and Environment

No. of Pages

147

Table of Contents

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Language

English

Data Type

Arab Theses

Record ID

BIM-609167