Abstract
Palynomorps of mainly dinoflagellate cysts are used in this study to assess age of Middle Jurassic (Bajocian–Bathonian) Sargelu, Upper Jurassic (Upper Callovian–Lower Oxfordian) Naokelekan, Upper Jurassic (Kimeridgian and Oxfordian) Gotnia and Barsarine, and Upper Jurassic–Lower Cretaceous (Beriassian–Tithonian) Chia Gara source rock Formations. Materials used for this palynological study are 85 core and cutting samples of five oil exploratory wells of Bj-1, Tk-3, Aj-8, K-109 and Tq-1 of selected North Iraqi oil fields. Palynofacies assessments are performed for this studied succession by ternary kerogen plots of the phytoclast, amorphous organic matters and palynomorphs. Accordingly, Chia Gara and Sargelu Formations are both deposited in distal suboxic to anoxic basin and can be correlated with kerogens classified microscopically as Type A and Type B, which comprised principally brazinophyte algae, dinoflagellate cysts, spores, pollen, foraminifera test linings and phytoclasts that could indicate affect of upwelling current. These deposits contain up to 18 wt% total organic matters that are capable to generate hydrocarbons within mature stage of thermal alteration index (TAI) range in Stalplin’s scale of 2.7–3.0 for the Chia Gara Formation and 2.9–3.1 for the Sargelu Formation.
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