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Palynofacies, palaeoenvironment, and source rocks evaluation of Ratawi Formation, Southern Iraq |
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| Authors: | Ryadh Younis Al-Obaidi Thamer Khazal Al-Ameri Amer Jassim Al-Khafaji |
| Institution: | 1. Department of Physics, College of Sciences for Women, University of Baghdad, Baghdad, Iraq 2. Department of Geology, College of Sciences, University of Baghdad, Baghdad, Iraq 3. Department of Chemistry, College of Sciences for Women, University of Babylon, Babylon, Iraq |
| Abstract: | Palynological analysis were done on 12 rock samples for Ratawi Formation from Rumailah well 131 and eight samples for the same formation from Zubair well 47, South Iraq, to extract sedimentary organic matters. Microscopic examination led to diagnose large numbers of spores, pollen, dinoflagellates (proximat, cavate, and chorate), foraminifera, melanogen, hylogen, and amorphogen. Three palynological facies were determined on the bases of percentages of sedimentary organic matter and palynomorphs from two sections. Analysis of these palynofacies clarified Ratawi Formation as deposited from environments ranging from delta and lagoon (suboxic–dysoxic) to shelf facies (anoxic near the shore–suboxic) with the presence of some layers deposited from semideep open marine environment (bathyal). Organic geochemical analysis of total organic carbon and Rock Eval pyrolysis were done to determine quantity, quality, and degree of maturation of the kerogen. Poor to medium proportion of total organic carbon of kerogen types II and III within a catagenesis stage are recorded in these rocks, and hence, poor hydrocarbon generation could be suggested for these strata. |
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