Palynofacies indications of depositional environments and source potential for hydrocarbons: uppermost Jurassic-basal Cretaceous Sulaiy Formation, southern Iraq

Palynofacies and Source Rock Potential of the ST-7H Well, Offshore Tano Basin, Western Region, Ghana

“…They contended that high AOM in organic rich sediments suggests reducing conditions and increased water column stability, resulting in dysoxic or anoxic bottom conditions. [21] reported a similar palynofacies association (PF-2) from the Jurassic basal Cretaceous Sulaiy formation, southern Iraq, and suggested a distal suboxic -anoxic basin environment for the assemblage.…”

الطباقية الحياتية وتقويم نشوء الغاز والنفط وتجميعهم في حقب الحياة القديمة الاسفل في غرب العراق

“…11 Hydrocarbon generation potential chart predicted from collide stratigraphical variations in kerogen types (senso Bujak et al 1977) paleoenvironments, maturation assessments, and total organic carbon (TOC) in Akkas and Khabour Formations of borehole Akkas-1. OM organic matter, TAI thermal alteration index, TR Tremadocian, VRo vitrinite reflectance value 0.5 kerogen type A of Thompson and Dembiki (1986) and amorphous organic matter of more than 60% as well as comparison of these analysis with models suggested by Tissot and Welte (1984) Batten (1996), Hunt (1996), and Al-Ameri et al (1999. The organic maters of this level are of marine organisms of Tasmanites, Pediastrum prazinophyte algae (Pterospermella, Cymatiosphaera, and Baculatireticulatus), and chitinozoa that hold the ability to generate light oil.…”

Hydrocarbon generation potential of the uppermost Jurassic—basal Cretaceous Sulaiy formation, South Iraq

“…5). The activities of these organisms would have been responsible for the formation of abundant amorphous organic matter, especially in palynofacies type 3 of Al-Ameri et al (1999) where it typically comprises between 90% and 100% of the organic matters. This palynofacies is associated with limestone that are clayey and/or pyrite rich in places.…”

“…The Sulaiy formation is one of the best source rocks in Southern Iraq, Kuwait, and Saudi Arabia (Beydhoun 1991;Al-Ameri et al 1999). It is composed of between 196 and 304 m of mainly alternating argillaceous, dolomite, and pyrite rich limestone units in Southern Iraq.…”

“…Sometimes, it cannot be clearly differentiated from this younger Formation (van Bellen et al 1959). Recently, palynological analyses performed by Al-Ameri et al (1999) have suggested Tithonian-Valanginian for the Sulaiy formation (including the Yamama Formation) in Southern Iraq. The same author recorded, in the Sulaiy formation, palynofacies types of high organic richness (up to 7 wt.% total organic carbon (TOC)) of mainly fluorescent amorphous organic matters with marine algal constituents, kerogen type A of Thompson and Dembicki (1986), and thermal alteration index of 2.8 based on brown color.…”