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Different approaches for prediction of reservoir volume in slope channel complexes (Miocene, offshore Nile Delta, Egypt)
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 78th EAGE Conference and Exhibition 2016, May 2016, Volume 2016, p.1 - 5
Abstract
Turbidite channel complexes are important reservoirs. Due to their heterogeneous architecture it is difficult to quantify the gross reservoir volume. Three methods were tested at a prospect case study. Seismic data quality allowed the detailed mapping of four sets of amalgamated channels inside the channel complex. The reservoir volume was calculated by multiplying the horizon area by thickness. Afterwards, it was tried to obtain the reservoir volume by applying an amplitude cutoff to the seismic and multiplying the cumulative amplitude area with a thickness. In a third approach, an acoustic inversion has been carried out and calibrated at a nearby well. Sand bodies have been extracted as geobodies based on an impedance cutoff. All three gross reservoir volumes were divided by the channel complex volume in order to compare the resulting net/gross ratios and they vary from 5%–20%. These net/gross ratios are lower than the net/ gross encountered in a well in a nearby channel complex, which is in-line with an observed higher sand content on seismic at that well location. Therefore, estimating gross rock volume from seismic could reduce the uncertainty compared to using offset well data only.