engleski

Quantification of production varibales in sandstone hydrocarbon reservoirs versus other lithologies in Croatia

Some studies for the CPBS stated that there is 2-4 times more oil had been generated than it was proven in existing reservoirs. Although it can be overestimated value, there is for sure some significant part of hydrocarbon reserves that could be: (a) Producing with increased maximal estimated recovery from existing fields, especially from the reservoir belonging to 2nd depositional megacycle, i.e. in Pannonian and Pontian sediments (1st reservoir lithofacies) ; (b) Discovering the new ones reservoirs as satellite to existing fields or maybe in the pre-Neogene basement or 1st Neogene megacycle (Badenian) ; (c) Estimation of gas potential for the youngest part of 2nd and the oldest of 3rd Neogene megacycle (Upper Pontian and Pliocene sediments). Potential reservoirs can be discovered using different geological models, especially models of regional and local hydrocarbon systems in the CPBS. In any case, the further exploration need to be oriented to regionally weaker explored chronostratigraphic units, like Badenian, Upper Pontian or Pliocene sediments. Stratigraphic traps in the sandstones of 2nd Neogene megacycle, located in the margins of larger anticlines with smaller closure, maybe can be primary goal for exploration of existing hydrocarbon fields.

Upper Pannonian and Lower Pontian sandstone reservoirs; Badenian coarse-grained clastites; Pre-Neogene carbonates; magmatites and metamorphites; production variables; Croatia

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