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Open AccessArticle

Kriging with a Small Number of Data Points Supported by Jack-Knifing, a Case Study in the Sava Depression (Northern Croatia)

1
The Faculty of Mining, Geology and Petroleum Engineering, University of Zagreb Pierottijeva 6, p.p. 390, HR 10000 Zagreb, Croatia
2
INA-Industry of Oil Plc., Trg G. Szabe 1, 44310 Novska, Croatia
*
Author to whom correspondence should be addressed.
Geosciences 2019, 9(1), 36; https://doi.org/10.3390/geosciences9010036
Received: 27 November 2018 / Revised: 4 January 2019 / Accepted: 7 January 2019 / Published: 11 January 2019
(This article belongs to the Special Issue Geostatistical Applications in Petroleum Geology)
The semivariogram and the ordinary kriging analyses of porosity data from the Sava Depression (Northern Croatia), are presented relative to the Croatian part of the Pannonian Basin system. The data are taken from hydrocarbon reservoirs of the Lower Pontian (Upper Miocene) age, which belong to the Kloštar Ivanić Formation. The original datasets had been jack-knifed with the purpose of re-sampling and calculating the more reliable semivariograms. The results showed that such improvements can assist in the interpolation of more reliable maps. Both sets, made by the original and re-sampled data, need to be compared using geological recognition of isoline’s shapes (such as “bull-eye” or “butterfly” effects) as well as cross-validation results. This comparison made it possible to select the most appropriate porosity interpolation. View Full-Text
Keywords: ordinary kriging; variogram; jack-knifing; Upper Miocene; Northern Croatia; porosity ordinary kriging; variogram; jack-knifing; Upper Miocene; Northern Croatia; porosity
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Malvić, T.; Ivšinović, J.; Velić, J.; Rajić, R. Kriging with a Small Number of Data Points Supported by Jack-Knifing, a Case Study in the Sava Depression (Northern Croatia). Geosciences 2019, 9, 36.

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