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Vol.1 , No. 1, Publication Date: Mar. 10, 2018, Page: 1-24
 were revealed. Two 3rd order Maximum Flooding Surfaces (MFS1 and MFS2) characterized by marker shales (Umgerna 8 and Nonon 4), high faunal abundance/diversity and high gamma ray peak were delineated and correlated with the Niger delta chronostratigraphic chart. Their dates are 9.5 and 10.4 Ma respectively. Lithofacies identified on well logs includes coarse-grained sandstones facies; shaly sandstone facies; mud-rock facies. These lithofacies showed three major stacking patterns (progradational, aggradational and retrogradational). Three major systems tract were delineated as Lowstand Systems Tract (LST), Trangressive Systems Tract (TST) and Highstand Systems Tract (HST) using their maximum flooding surfaces. The Lowstand Systems Tract (LST) consists of Basin Floor Fans (BFF), Slope Fans and amalgamated channel Sands. Transgressive Systems Tract (TST) consists of retrogradational fine grained marine shales. Highstand Systems Tracts (HST) consists mainly shoreface sands exhibiting mostly aggradational to progradational stacking patterns. The results of this study showed that there are seven (7) quality reservoir sands in the LST and HST while the shales of the TSTs form potential reservoir seals. Structural analysis revealed the major hydrocarbon traps in the area [36].&picture=http://www.aascit.org/aascit/decorators/img/journal/933.jpg)
| [1] | Jude Enyinnaya Oleson, Department of Geology, Federal University of Technology, Owerri, Nigeria. |
| [2] | Samuel Okechukwu Onyekuru, Department of Geology, Federal University of Technology, Owerri, Nigeria. |
| [3] | Obaje Eneojo Christian, Department of Geology, Federal University of Technology, Owerri, Nigeria. |
| [4] | Stephen Onum Adikwu, Department of Geology, Federal University of Technology, Owerri, Nigeria. |
A sequence stratigraphic analysis of depositional systems in the “Alpha” field located at the eastern coastal swamp depobelt of the Niger delta was carried out using Well logs, Seismic and Biostratigraphic data from 6 wells to delineate potential hydrocarbon prospects. The genetic sequence stratigraphic model was adopted and three 3rd order depositional sequences (SQ1, SQ2 and SQ3) were revealed. Two 3rd order Maximum Flooding Surfaces (MFS1 and MFS2) characterized by marker shales (Umgerna 8 and Nonon 4), high faunal abundance/diversity and high gamma ray peak were delineated and correlated with the Niger delta chronostratigraphic chart. Their dates are 9.5 and 10.4 Ma respectively. Lithofacies identified on well logs includes coarse-grained sandstones facies; shaly sandstone facies; mud-rock facies. These lithofacies showed three major stacking patterns (progradational, aggradational and retrogradational). Three major systems tract were delineated as Lowstand Systems Tract (LST), Trangressive Systems Tract (TST) and Highstand Systems Tract (HST) using their maximum flooding surfaces. The Lowstand Systems Tract (LST) consists of Basin Floor Fans (BFF), Slope Fans and amalgamated channel Sands. Transgressive Systems Tract (TST) consists of retrogradational fine grained marine shales. Highstand Systems Tracts (HST) consists mainly shoreface sands exhibiting mostly aggradational to progradational stacking patterns. The results of this study showed that there are seven (7) quality reservoir sands in the LST and HST while the shales of the TSTs form potential reservoir seals. Structural analysis revealed the major hydrocarbon traps in the area [36].
Keywords
Sequence Stratigraphy, System Tracts, Stacking Patterns, Seismic
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