DOI: 10.5176/2251-3353_GEOS13.27
Authors: Muhammad Irfan, Wan Ismail Bin Wan Yusoff, Mohamed Khalifa, and Muhammad Ahmed Raza
Abstract: Despite several discoveries in the lower Jurassic sequence of Eromanga Basin has been target on structural trap. Complex fluvial-lacustrine depositional environment of Basal Jurassic, Hutton sandstone, and Birkhead formation marks the significant hydrocarbon still remain in stratigraphic reservoir. Detail understanding of stratigraphic distribution, in terms of lithology and facies with its depositional environment variation, connectivity and effectiveness of seal rock can provide a complete mechanism of stratigraphic reservoir. In this study geophysical log and well data has been used to map the stratigraphic and fluvial facies distribution of study area. Each step contain a specific significance in context of results. Composite log display has been used to mark well tops and lithological interpretation for sandstone and siltstone vertical distribution in each well for Jurassic Birkhead, Hutton sandstone and Basal Jurassic formation. Log motif analysis for sedimentology from well data used to identify major fluvial facies which are fluvial channel, floodplain, crevasse splay complex. NS correlation section showing the lateral distribution and continuity of lithology and facies. Thickness map has been generated for the distribution of each formation in study area. Result showing that lower Jurassic sequence of Eromanga Basin unconformably overlies over cooper basin, and the deposition of this sequence continuous, with fluctuation in base level, accommodation space and sediment supply control by subsidence, tectonic and climate. Point bar and channel reservoir sandstone in Basal Jurassic, Hutton sandstone and Birkhead formation are enclosed by floodplain facies which act as a seal rock for stratigraphic reservoir in study area.
Keywords: facies; fluvial-lacustrine; wireline log
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