Integration of seismic and well log data for petrophysical modeling of sandstone hydrocarbon reservoir in Niger Delta

Abstract

For accurate reservoir property determination, four well logs and seismic data of 5500 to 5900 Xline and 1480 to 1720 Inline range were used to delineate the hydraulic zones of two reservoirs of interest and to determine the average petrophysical properties of the reservoirs.. All the wells contained GR, resistivity, sonic and density logs. The data were conditioned for interpretation using PETREL software. Reservoirs of interest were delineated by interpreting the well logs. These delineated reservoirs (reservoir D and F) were then correlated. The lateral extent of the reservoirs was determined by tying well 2 to the seismic. Different hydraulic zones (stratigraphic intervals) of the reservoir were established. Zonation of the reservoirs enhanced the sensitivity of the petrophysical properties in every stratigraphic interval of the structural model. Petrophysical model parameters were delineated along each well location, the model was upscaled and populated on the structural model. The features of the reservoir rock were conspicuous on the structural models of reservoirs D and F. The average determined porosity, permeability, NTG and water saturation with respect to each reservoir was 22.4%, 22.02%; 1444 md, 1375 md; 72.3, 84.9; and 39.5, 39.4 respectively. Hence there exist a very good porosity and an excellent permeability for the formation in the study area. All other determined parameters were also favorable for hydrocarbon production in this field.

Keywords: seismic, well lods, porosity, permeability, water saturation and Net-to-Gross