There are eleven reservoirs in Ivana Gas Field and they are composed of Pleistocene sands, silt sands and siltstones, developed in dominant clays and marls depositional sequences. Ika Gas Field is the only field in Adriatic with gas accumulated in carbonate rocks, which are the deepest reservoir of the total four reservoirs. A carbonate reservoir is defined with tectonical and erosional unconformity, which is placed between Mesozoic and Pliocene rocks. The three younger Ika reservoirs are composed of Pleistocene sands, silt sands and siltstones that are laminated into clays and marls. The goal of our study was to assess the ‘Probability Of Success’ (POS) of finding new gas accumulations within the marginal area of those two fields, either in the form of Mesozoic rocks or Pleistocene deposits. The assessment was successfully completed using the Microsoft Excel POS table for the analyzed areas in the Croatian part of the Po Depression, namely, Northern Adriatic. The methodology was derived and adapted from a similar POS calculation, which was originally used to calculate the geological probability of hydrocarbon discoveries in the Croatian part of the Pannonian Basin System (CPBS).
If the inline PDF is not rendering correctly, you can download the PDF file here.
 Đureković M. Jovović S. Krpan M. Jelić - Balta J. (2002): Ika gas field characterization and modelling Nafta 53 8 273-282.
 Živković V. (2015):Production platforms of exploitation field North Adriatic (Proizvodne platforme eksploatacijskog polja Sjeverni Jadran) DiplomaThesis University of Zagreb Faculty of Mining Geology and Petroleum Engineering Zagreb 46 p. (in Croatian with the English summary
 Velić J. (2007): Geologijaležištanafteiplina (Geology of oil and gas reservoirs). University of Zagreb Faculty of Mining Geology and Petroleum Engineering Zagreb; 342 p. (in Croatian)
 Malvić T. (2009): Stochastical approach in deterministic calculation of geological risk - theory and example (Stohastički pristup u determinističkom izračunu geološkoga rizika - teorija i primjer). Nafta 60 12 651-662.
 Malvić T. Velić J. Cvetković M. Vekić M. Šapina M. (2015): Određivanje novih pliocenskih pleistocenskih i holocenskih litostratigrafskih jedinica u hrvatskom dijelu Jadrana (priobalju) [Definition of new Pliocene Pleistocene and Holocene lithostratigraphic units in the Croatian part of the Adriatic Sea (shallow offshore)] Geoadria 20 2 85 - 108. (in Croatian)
 Malvić T. Đureković M. Šikonja Ž. Čogelja Z. Ilijaš T. Kruljac I. (2011): Istraživačke i proizvodne aktivnosti u Sjevernom Jadranu (Hrvatska) kao primjer uspješnog zajedničkog ulaganja Ine (Hrvatska) i ENIja (Italija) [Exploration and production activities in northern Adriatic Sea (Croatia) successful joint venture INA (Croatia) and ENI (Italy)]Nafta 62 9-10 293-296. (in Croatian and English)
 Pavić N. (2007): Petrofizikalne značajke ležišnih stijena plinskih polja u Sjevernom Jadranu (Petrophysical characteristics of reservoirs rocks in Gas fields of Northern Adriatic)Diploma Thesis University of Zagreb: Faculty of Mining Geology and Petroleum Engineering Zagreb 41 p. (in Croatian)
 Malvić T. (2003): Naftnogeološki odnosi i vjerojatnost pronalaska novih zaliha ugljikovodika u bjelovarskoj uleknini [Oil-Geological Relations and Probability of Discovering New Hydrocarbon Reserves in the Bjelovar Sag]. PhD thesis University of Zagreb Faculty of Mining Geology and Petroleum Engineering Zagreb 123 p. (in Croatian and English)
 Malvić T. Đureković M. Rusan I. (2006): Vjerojatnosni razredi i geološki događaji u izračunu geološke vjerojatnosti. 4th international petroleum congress »New Approaches and Methods in Evaluating Hydrocarbon Reserves«. Programme Committee (ed.). HAZU RGNF INA Zagreb 16.-18. 11. Zagreb 25-26.
 Režić M. (2016): Opći model zaizračungeološkevjerojatnostinovihotkrićaplinanapodručjuSjevernog- JadranauzprimjerplinskogpoljaIka (General model for the calculation of geological probability associated with new gas discoveries in the Northern Adriatic with an example of the Ika gas field) Diploma Thesis University of Zagreb Faculty of Mining Geology and Petroleum Engineering Zagreb 48 p. (in Croatian with English summary)
 Velić J. Malvić T. (2011): Depositional conditions during Pliocene and Pleistocene in Northern Adriatic and possible lithostratigraphic division of these rocks (Taložniuvjetitijekompliocenaipleistocena u SjevernomJadranutemogućalitostratigrafskaraščlambanastalihstijena). Nafta 62 1-2 25-32.
 Prelogović E. Kranjec V. (1983): Geološki razvitak područja Jadranskog mora [Geological evolution of the Adriatic Sea]. Pomorski zbornik 21 387-405. (in Croatian)
 Correggiari A. Roveri M. and Trincardi F. (1996) Late Pleistocene and Holocene Evolution of the North Adriatic Sea Quaternario 9 2 697-704.