Abstract:

Abstract: Oil/gasbearing area and net pay thickness are the two key parameters for reserve calculation of fluvial sandstone reservoirs in Bohai oilfield. Quality seismic data and logconstrained seismic inversion technology were used to predict the area and thickness of oil/gasbearing sandbodies with accuracy over 80%. The abundant formation pressure data available were used to predict oil/gaswater contacts. The prediction results coincide well with the measured data, effectively enhance the accuracy of oil/gasbearing area for reserve calculation. Sidewall core data and formation pressure data were used to determine the lower limit of net pay thickness. The ΔSP/ΔRxo was used to identify low resistivity oil layers and the accuracy is up to 100%.