engleski

Using of Ordinary Kriging for indicator variable mapping(example of sandstone/marl border)

Sedimentation in small, structural depressions had great influence on locations of facies, as well as on boundaries of the reservoir and distribution of porosity and permeability. Fault of the structural depressions are also often boundaries between turbidity sandstone and basin marl. Turbiditic sandstones had been deposited periodically, and in their top or base is always marl. Facies boundaries are not sharp. There is wide transition zone in toward basinal plain as well as in the direction of turbidite current palaeotransport (Malvić, 2006). Boundaries of transitional zones are not sharp and there are several transitional lithotypes. Mapping of the facies 0 and 1 (marl and sandstone) was made in Surfer8.0TM program, using the geostatistical technique of Ordinary Kriging, interpolated isolines 0, 0.5 and 1. Number of input data in the first case was 25 and this number was increased in the second case on 37. Line 0.5 is representing border of facies 0 and 1, i.e. line of lateral facies changing in Upper Miocene sediments (it also can be considered as line between sandstone and marl). The 0.5 line is very similar in the both cases as the borders ‘ interpolated by hand’ , i.e. with line on half distance between data 0 and 1. Interpolated 0.5 line can be applied for any modelling purpose as (depending on selected cutoff variable): (a) border between oil-saturated and water-saturated sandstone facies or (b) border between sandstone and marl in the same depositional environment

indicator variables; sandstone; marl; mapping; ordinary kriging; Pannonian basin

Predavanje je održano 8. listopada 2009., s početkom u 18 sati, na Geološkom odsjeku Sveučilišta u Szegedu. Uz predavače su nazočili mentor odsjeka prof. dr. Janos Geiger, predsjednica Janina Horvath, te oko 20-ak studenata.