oa Reservoir characterization and modeling for a carbonate field

The study area contains highly heterogeneous Ordovician carbonate reservoirs with potential to produce both oil and gas. The reservoirs consist of heterogeneous fractured carbonates, which are difficult to characterize because of limited data and large well spacing. The aim of the study was to reduce exploration risk by enhancing the understanding of the depositional environment, digenetic overprint and the reservoir distribution. An integrated approach was required to understand the vertical and lateral distribution of the reservoir. This was achieved by using geological, geophysical, petrophysical and engineering data. A 3-D static model was constructed in order to visualize the distribution of the reservoir characteristics. Core description, thin-section analysis borehole geological interpretation and petrophysical analysis were combined to assess the pore level control on reservoir quality. A 3-D seismic interpretation and multi-attribute seismic analysis were used to identify seismic facies. The seismic facies were compared<br>and classified based on pore volume distribution and anomalies. These were used to supervise the reservoir properties distribution and modeling in this highly heterogeneous reservoir.