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Geostatistics as a Group of Methods for Advanced Mapping of Geological Variables in Hydrocarbon Reservoirs

Geostatistics is a well-known and advanced mapping tool in geology of hydrocarbon reservoirs as well as in geosciences in general. It offers a lot of different methods and techniques for mapping of all geological variables that could define a subsurface volume with oil and gas reserves. These variables can be obtained from all types of measurements in petroleum industry, like seismic, well cores or well logs. In the last decade, many reservoirs of different lithologies (clastics, carbonate, metamorphic) had been mapped by kriging and cokriging (as deterministic methods) as well as by Sequential Gaussian Simulations (as a stochastic method) in the Croatian part of the Pannonian Basin System. The results gave more detailed insight in reservoir space, i.e. more precisely outlined petrophysical parameters of reservoirs, the role of faults and the borders of the field structures. It emphasised the recommendation for using geostatistics in reservoir analysis, especially in the development phase when more data are available, for all types of lithologies, but especially in sandstone and breccia-conglomerate reservoirs with dominant primary porosity. This set of mapping methods can be considered as an advanced mapping tool.

hydrocarbon reservoirs; geostatistics; kriging; stochastic simulations

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