Abstract
Yamama Formation (Valanginian-Early Hauterivian) carries a special economic importance, since it represents one of the well known oil reservoirs southern Iraq. To evaluate the organic material contents of this formation an organic geochemical study was conducted. A total of 58 out of 227 previously collected and described core samples were analysed using pyrolysis method; these samples represent five oil wells which are distributed over West Qurna (WQ) field. The organic material of the selected samples were separated then analyzed using Rock-Evaltechnique.The organic geochemical data confirm that the Yamama rocks of WQ field represent a source rocks that posses a poor to very good properties depending upon the quantitative evaluation of petroleum potential (PP) and total organic carbon (TOC). The source rocks were thermally matured except in some few samples found at depth below 3700 m. These samples were exceeded the maturation stage leading to the formation of pyrobituminous layer of variable thickness. Most of Yamama organic matters were related to type II kerogen that produces oil and gas prone. Few samples are related to type III kerogen that produces gas prone. ــــــــــــــــ ــــــــــــــــ ــــــــــــــــ ــــــ
Highlights
The values of Hydrogen Index (HI), Production Index (PI), and Petroleum Potential (PP) were estimated following the method suggested by Langford and Blance-Valleron, (1990)
Most organic matter in non-reservoir rocks consists of kerogen, which is nothing but a mineraloid matter of indefinite composition
The graphical representation of Hydrogen index (HI) verses Tmax. (Fig. 2) clarify that the majority of Yamama organic matter belongs to type II of kerogen which resembles most the of middle east oil as shown by Al-Sakini, (1992), this type of kerogen derived from marine organisms of both types plants and animals that produce oil and gas prone
Summary
The aim of the present study is to shade light on the origin, behavior, preservation and maturation history of Ymamam Formation organic matter
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