Impact of Sequence Stratigraphy in Depositional Environment Setting and Reservoir Characterisation of Field 'AY' In Onshore Niger Delta |
Author(s): |
| Kelechi Azubuike-Ijomah , University of Port Harcourt; Etu-Efeotor John, University of Port Harcourt; Kingsley Okengwu, University of Port Harcourt |
Keywords: |
| Sequence Stratigraphic, Depositional Environment, Lowstand System Tract, Highstand Lithofacies and Transgressive System Tract |
Abstract |
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A sequence stratigraphic and depositional environment interpretation study was carried out in the study area using available biofacies data, sidewall core report and core photos of wells AY1 and AY3 as provided. The study area had four wells AY1, AY2, AY3 and AY4, and showed presence of hydrocarbon at different depths of sand bodies U, V and W from well log section information given. Six main lithofacies were identified and interpreted as; Cross bedded coarse grained sandstone, Cross bedded medium grained sandstone, Planar/Parallel laminated sandstone, Wavy rippled sandy heterolith, Parallel laminated mudstone and Wavy rippled heterolith. The sequence stratigraphic study revealed that the lithofacies of the lowstand system tract comprise of the cross-bedded coarse grained sandstone and the cross-bedded medium grained sandstone. The highstand lithofacies comprises of the cross-bedded medium grained sandstone, Parallel/Planar laminated sandstone and Wavy rippled sandy heterolith. The transgressive system tract acts comprises lithofacies of Parallel laminated mudstone (MPL) and wavy rippled muddy heterolith (MWH). The three hydrocarbon oil bearing reservoirs(sand U, V and W) seen across the four wells, have two of these reservoirs; sand U and W within the lowstand system tract (LST) while the sand V is within the HST. The transgressive system tract acts as the seal. |
Other Details |
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Paper ID: IJSRDV5I110349 Published in: Volume : 5, Issue : 11 Publication Date: 01/02/2018 Page(s): 530-535 |
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