Journal of Earth Sciences and Geotechnical Engineering

Well log sequence stratigraphic analyses for reservoir delineation and hydrocarbon distribution in the eastern part of the central swamp depobelt, Niger Delta

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  • Abstract

     

    Sequence stratigraphic analysis was conducted employing Gamma Ray and Resistivity logs from five wells in the eastern part of central swamp depobelt, Niger Delta. Interpretation by Kingdom Suite software shows that lithologies are defined by Sequences I, II and III comprising two marine transgressive shale markers and correspond to MFS. Sequences I and III are incomplete comprising one SB while Sequence II is complete. Types 1 and 2 sequence boundaries are contained within the sequences. Key stratigraphic surfaces subdivide strata into LST, TST and HST. LST consisting of SF and PC. Sequence I comprises LST and HST while sequence III comprises SMST bounded by type 2 unconformity. The TST of sequence II comprises a retrogradational set of parasequences while the HST of sequences I and II comprise a progradational set of parasequences. The LST shows high reservoir potential and may act as a stratigraphic trap for hydrocarbon because the shales overlying the LSF act as a seal and within the SF complex. To assign ages and depositional cycles to the identified surfaces, an integrated sequence stratigraphic analysis should be conducted to accurately model the lithostratigraphic and chronostratigraphic settings of the depositional sequence of the study area.


    Keywords: Maximum Flooding Surface (MFS), Lowstand System Tract (LST), Transgressive System Tract (TST), Highstand System Tract (HST), Slope Fan (SF), Prograding Complex (PC), Shelf Margin System Tract (SMST), Lowstand Fan (LSF).