Preliminary communication
Production of a Porosity Map by Kriging in Sandstone Reservoirs, Case Study from the Sava Depression
Tomislav Malvić
; INA-Industrija nafte, d.d., Exploration and Production of Oil and Gas, Reservoir Engineering and Field Development Dept., Zagreb, Croatia
Abstract
Variogram analyses and usages of geostatistical
interpolations have been standard analytical
tools in Croatian geology in the last five years. Such
analyses have especially been applied in the mapping
of petroleum geological data. In this paper, spatial modelling
of porosity data and, consequently, kriging mapping
are described for a relatively large dataset obtained
at an oil field located in the Croatian part of
Pannonian basin (Sava depression). Analyzed datasets
included porosity values measured in a sandstone
reservoir of Pannonian age. The original dataset can
be considered as a rare extensive porosity set available
for Croatian hydrocarbon reservoirs. It made possible
very reliable semivariogram modelling and kriging
interpolation of porosity. The obtained results point
out kriging as the most appropriate interpolation approach
for porosity, but also for other geological data
in sandstone reservoirs of Miocene age.
Keywords
porosity; semivariogram; kriging; oil reservoir; Sava depression; Croatia
Hrčak ID:
27003
URI
Publication date:
30.6.2008.
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