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Palynological Study of the Campano-Maastrichtian Nkporo Group of Anambra Basin, Southeastern, Nigeria

100%
Chiadikobi K. C., Chiaghanam O. I., Onyemesili O. C., Omoboriowo A. O.
World News of Natural Sciences
|
2018
|
vol. 20
31-53
EN
Palynological assemblages were used in the determination of the age and paleoenvironment of the Nkporo and Enugu Formations of the Anambra Basin, Southeastern Nigeria. Palynological analysis carried out in over twenty-five samples (25) yielded spores, pollens and marine species. The main diagnostic species of spores and pollen recovered includes; Foveotriletes margaritae, Distaverrusporites simplex, Cingulatisporites ornatus, Echitriporites trianguliformis, Longapertites marginatus, Proteacidites segali, Monocolpites marginatus, Constructipollenites ineffectus, Buttinia andreevi, and Retidiporites which were dated to Late Campanian to Earliest Maastrichtian. Also, other sporomorphs includes; Longapertites marginatus (overwhelming abundance), Longapertites microfoveolatus, Longapertites vaneedenburgi, Spinizonocolpites baculatus, Foveotriletes margaritae, Distaverrusporites simplex, Cingulatisporites ornatus, Matonisporites equiexinus, Azolla marsulae, Mauritidiites crassibaculatus, Constructipollenites ineffectus, Echitriporites trianguliformis, Foveotriletes margaritae, and Leiotriletes minor were assigned to Early Maastrichtian. From the palynological analysis, the age-diagnostic index palynomorphs reveal that the Nkporo Group is within Late Campanian to Early Maastrichtian and the depositional environment is mostly marginal marine to marine.
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Visual Kerogen Study of the Campano-Maastrichtian Nkporo Group of Anambra Basin, Southeastern Nigeria

88%
Chiadikobi K. C., Chiaghanam O. I.
World News of Natural Sciences
|
2018
|
vol. 19
142-154
EN
In this work, phytoclasts, opaques, Amorphous Organic Matter (AOM) and palynomorphs of the Nkporo group underwent Visual Kerogen analysis. Herein, the average percent counts of phytoclasts are about 42.08%, opaques are about 34.54%, Amorphous Organic Matter (AOM) is about 16.34% and Palynomorphs are about 7.08%. The highest number of percent counts produced is found in the phytoclasts (the value of 42.08% indicating Type III kerogen and Gas Prone) and Amorphous Organic Matter (AOM) (the value of which - 34.54% - indicates Oil/Gas Prone). Thus, from the results of the visual kerogen, in the Nkporo Group, the source rock is of Type III kerogen, which is gas prone, and also Type II/III, which is Oil/Gas prone.
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