--> Abstract: Assessment of Hydrocarbon Generation Potential in Silurian Akkas and Ordovician Khabour Formations, Akkas Oil and Gas Field, Western Iraq, by Thamer K. Al Ameri and Mohamed Zine; #90072 (2007)

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Assessment of Hydrocarbon Generation Potential in Silurian Akkas and Ordovician Khabour Formations, Akkas Oil and Gas Field, Western Iraq

Thamer K. Al Ameri1 and Mohamed Zine2
1University of Baghdad, College of Sciences, Baghdad, Iraq
2IHS Energy, Gloucestershire, United Kingdom

Tow hundred and twenty samples of cores and cuttings collected from the Khabour and Akkas Formations in Akkas/ 1-6, Khleisya/1, KH5/6 and KH 5/1 boreholes. They were subjected to palynological and organic geochemical analysis. Accordingly, abundant acritarch (134 species belonging to 54 genera) assemblage and a few spores (21 species belonging to 16 genera) and Chitinozoa (43 species belonging to 12 genera) with variable types of sedimentary organic matters are recognized in order to develop the stratigraphic framework of the studied area, while optical and chemical analysis are for assessing the hydrocarbon generation and accumulation in this basin. On the basis of acritarchs with tentative selections of Chitinozoa and spores, the studied stratigraphic section are subdivided into the Ordovician Khabour, and the Silurian Akkas and the Upper Devonian Kaista formations in a succession of ten palynozones within a stratigraphic framework. Formations of this section were deposited in marine environments extending for outer to inner neritic with local upwelling currents and lagoons, especially in boreholes Akkas/1, KH5/1 and KH5/6. Maturation assessments are on the basis of the Thermal Alteration Indices (TAI) of the acritarchs Diexallophasis denticulata-Orthosphaeridium ternatus and Baltisphaeridium constrictum while hydrocarbon generation potential are assessed by plotting. Organic matter types on the Bujaks (1970) graphical model. On the other hand, kerogen analysis have showed that the Thompson Kerogen types A & B, total organic carbon (TOC) up to 16%, especially for the hot shale of the Lower Silurian Akkaz Formation, very low asphaltene and sulphur, saturated and aromatic hydrocarbons of more than 96% and high peaks of C2-C20 gas chromatography could indicate predominant gas generation with some light oils.

 

AAPG Search and Discovery Article #90072 © 2007 AAPG and AAPG European Region Conference, Athens, Greece