Core sedimentology of Ticleni field (well 2010): Implication on its reservoir properties and hydraulic flows.
- Author Abimbola A Durogbitan
- DOI
- Country : United Kingdom
- Subject : Geology and Earth Science
Abstract
This work analysed depositional environments and facies associations of Ticleni well 2010 within the Helvetian interval based on core and ichnological data, incorporating with well log stacking patterns. From the core data, two facies association has been recognised base on composition, colour, sedimentary structures, indurations and ichnofabric constrained by wireline logs and seismic reflection patterns. They are slope channel sand/ deep sea sand (turbidites) and shoreface sequences. These interpreted depositional facies model suggest an extensive fluvial to marine dominated slope/deep sea sand fill and shoreface deposit within the well. This may suggest that in the study area, the coastal barrier complex may contains a large sand that was originally deposited in river mouth bars, but was laterally reworked by longshore currents, tidal currents and redeposited on the shoreline margin and basinward through canyon on the shelf and slope which may serves as conduit and a feeder for slope and basin (deep sea) fans. The descriptive framework for the ichnofabric analysis is based on the Bioturbation Index (BI) i.e. degree of bioturbation, burrow size, burrow frequency and ichnological diversity based on (Taylor Goldring, 1993). The observed tiering patterns are both simple and complex (Goldring, 1995), which reflect gradual and aggradation or degradation of the substrate leading to overprinting as a stable ichnofauna structure develops. This type of tiering indicates a stable environment. Cyclicity of sand facies and mudstones facies were observed within the core interval. This indicate episodic event which reflect relative rise and fall in sea level and current/wave energy fluctuations at different intervals. The lithofacies within the well 2010 have useful log characteristics. Porosity/Permeability (Phi/K) in the 2010 Helvetian cores suggests that there are a number of hydraulic flow units (HFU). One suggestion is that we have seven (7) HFU’s with associated poro-perm relationships. Note that the HFU trends are parallel, which suggests that HFU’s may be realistic Sedimentological analyses indicated that the depositional environment range from inner shelf to offshore.
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