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ABSTRACT
Reservoir modeling is often associated with uncertainties that lead to inadequate description of the reservoir and inappropriate prediction of field performance. Various techniques are being developed to reliably predict reservoir properties for appropriate reservoir characterization and field performance respectively. The reliability with which this can be achieved is tied to validating the data acquired from one method of investigation with another. Amongst the various methods are seismic inversion and well integration. The case study for this research is the X-field of the Niger Delta Province. Well log data for seven (7) wells and seismic volume spanning the field were collected and analyzed to predict water saturation, porosity, shale volume and net-to-gross sand distribution. The analysis was performed using Schlumberger-Petrel software (2014 version). Multiple data sets acquired from well logs and seismic survey from the field were tied together to estimate petrophysical properties.X-Field generally represent a very prolific Field for Hydrocarbon exploration and production, the Reservoir parameters are perfect so that any further production effort would be economically viable. A Geological model comprising structural and stratigraphic framework for the X-field strata was constructed by combining data from 7 well logs and a seismic volume spanning the area extent of the field. The property distribution within the reservoir was achieved by employing geostatistics - Sequential Gaussian Simulation (SGS) and trend maps. The petrophysical parameters; porosity, water saturation, net-to-gross ratio were evaluated from the well logs for each of the reservoirs. Average net-to-gross value of 70%, water saturation value of 90% while porosity value of 20%, reflecting well sorted coarse grained sandstone reservoirs with minimal cementation, indicating very excellent reservoir quality. Other calculated petrophysical parameters are bulk volume 84868 (acre.ft), net volume 28466 (acre.ft), pore volume 3740 (acre.ft), HCPV oil 1297 (acre.ft) and STOIIP 8925805 (STB). Structural analysis revealed that the reservoirs were fault closed, bounded by the typical Niger Delta Growth faults. The Hydrocarbon in place was estimated for E-5 reservoir. Reservoir E-5 had a STOIIP value of 8925805STB. Reservoir E-5 showed the good values for both porosity and net-to-gross. The thickness of the reservoir across the 7 wells are, wells 25 and well 3 has 110ft, well 60, 2, 58 and 35 is 122ft, 71ft, 101ft and 87ft respectively.
