Naslov
The importance of selected geological variables in characterization of mature hydrocarbon fields

Autori
Malvić, Tomislav ; Balić, Davorin

Izvornik
Naftaplin (1330-2434) 65 (2011); 59-67

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
mature hydrocarbon fields; geological variables; compaction; depositional environments; sandstones

Sažetak
Geological characterisation of mature hydrocarbon reservoirs is standard procedure, with well-known workflow and geomathematical basis in all cases where decline of production is observed. Such production decreasing is described with decline curve where is clearly stated period of still economical positive recovering. Also, declining period is described with progressively higher share of water in total recovered fluids and consequently application of secondary and tertiary methods of reservoir stimulation (water flooding, gas lift) with goal to increase total recovery. The increasing of total produced hydrocarbon reserves depends on right calculation of inter-dependence among reservoir variables (porosity, depth and thickness). The most of them are also geological variables that mostly do not change their measured values in decametre scale during production. They are base for geological model creation. However, in period of field maturation the most often means progressively higher number of point data. This new, larger dataset is base for calculation of newer, more detailed geological model and calculation more precise relations between production rate and mentioned geological variables. Such progress is especially possible to realize in homogenous sandstone reservoirs, i.e. inside central channel zone with thick (several tens meters) sandstone facies. Obtained values then can be extrapolated in marginal, inter-channel or levee-bank areas, i.e. in facies of thin sandstone layers (several meters) or facies of marly sandstones. In such cases, there is need to establish: (a) relations among depositional environment type, lithofacies and their average thicknesses, (b) influence of compaction regarding depth differences and reflectance in porosity decreasing and (c) number of data and selection of the most appropriate interpolation method for mention point data.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

POVEZANOST RADA