PAPER TITLE :A GEOSTATISTICAL RISK ASSESSMENT OF THE HYDROCARBON POTENTIAL IN “AMESERE” FIELD, NIGER DELTA, NIGERIA

JOURNAL OF EARTH AND ATMOSPHERIC RESEARCH | VOLUME 1 NUMBER 1 2018

Paper Details

  • Author(s) : Falebita, D. E., Osotuyi, A. G. and Akinsanpe, O. T.
  • Abstract:

This study assessed two hydrocarbon reservoirs A and B in 'AMESERE' Field within the Miocene Agbada
Formation by utilizing quantitative, deterministic and stochastic simulation workflows on some
petrophysical parameters (gross pay, net pay, porosity and water saturation) obtained from irregularly
distributed 24 well logs that penetrated the reservoirs. This was with a view to modelling the spatial
variability and field-wide extrapolated heterogeneity models of the reservoir across the study area. Average
unbiased estimation maps constrained by exponential variogram models of the parameters data were
produced and used as inputs for Sequential Gaussian Simulation (SGSIM), a modelling algorithm to produce
fifty (50) equally probable realizations. These were used to risk the parameters at different probability levels.
In reservoir A at P10, P25, P50, P75 and P90, simulated gross pay was between 11.13 and 22.29 m; net pay
was between 2.41 and 13.50 m; porosity was between 18.00 and 33.00%; and water saturation was between
14.02 and 74.96% respectively. In reservoir B at P10, P25, P50, P75 and P90, simulated gross pay was
between 17.85 and 57.28 m; net pay was between 5.55 and 49.64m; porosity was 22.00 and 33.00%; and
water saturation was between 10.57 and 88.77% respectively. These results are consistent with geostatistical
modelling because they show different plausible realizations that quantify varying risks in the distribution of
the petrophysical data within the reservoirs.

JOURNAL OF EARTH AND ATMOSPHERIC RESEARCH