Sequential Gaussian simulation in the modelling of small-scale heterogeneity of-point bars

Abstract

The possibility of carrying out of sequential Gaussian simulation with respect to the traditional
interpretation of a sedimentary rock body has been demonstrated in the analysis of the Holocene and a
Pannonian (s.l.) point bars. In this approach, the Holocene rock body served as the basis for the
interpretation of the result attained for the Pannonian (s.l.) rock body.
According to the detailed variography, the lateral anisotropy of the groundwater level data coincides
with the depositional strikes of the accretion surfaces of the recent point bar. On the nested variogram
model the largest range may be derived from the size of the point bar, while the medium one may be
worked out from the strike of the meander belt, and the smallest one reflects the small scale
heterogeneity of the deposits that have built up on Holocene point bar under consideration. Due to the
result of the E-type estimation of 100 stochastic realizations, a very detailed surface is evident and this is
in harmony with the small-scale sedimentological characters of the sedimentary rock body.
In the case of Pannonian point bar, the channel system and the geometry of the point bar identified
by well-log response analysis appear in the results of sequential Gaussian simulation of log-porosity
data. The interpretation of the largest and smallest range could be done on the basis of the interpretation of the Holocene point bar. The lateral uncertainties of the map as well as the surfaces of the
upper and lower limits of the probability interval of porosity were derived from 100 stochastic
realizations.