Canada-based Vermilion Explorationâs second quarter 2019 report, recently released, states that its Croatian subsidiary Vermilion Zagreb Exploration d.o.o. tested new-field wildcat Ceric 1 in the Sava 10 (SA-10) licence in northeastern Croatia. The well yielded gas flow at a rate of 6.2 MMcf/d - stabilized flowing pressure of 1,376 psi on a 0.37â choke â from 1,167-1,177 m zone within the Upper Miocene Pannonian sandstone succession. The 18-hour flow test followed upon a one-hour test following perforating that delivered 15.0 MMcf/d (stabilized flowing wellhead pressure of 851 psi on a 0.86â choke). Both tests were formation water-free. The well, solely operated by Vermilion, encountered net 10 m (32 feet)-thick reservoir in two Upper Miocene horizons (1,020-1,022 m and 1,167-1,177 m), with only the lower zone tested.  Ceric 1, started in mid-June 2019, is located in the Vukovar-Srijem county, approximately 100 km east-southeast of the capital city of Zagreb. In a geological sense, the area falls within the Slavonian Sub-basin, tectonic unit of the Pannonian Basin.  The well was believed to be targeting the Pannonian-age (Miocene) series at shallow depths (+/-1,200-1,300 m).  Vermilion reaffirmed in May 2019 it is planning to drill the Ceric 1 exploration well - the spud of the well was expected on 17 June 2019. The drilling of the well was expected to take approximately 30 days. The news on the successful testing of Ceric 1 was disclosed on 29 July 2019.  Background Information  The Sava 10 contract was awarded to Vermilion on 10 June 2016 following the 1st onshore licensing round. The contract has a five-year exploration phase and a 25-year production phase. The tract is situated along the border with Bosnia and Herzegovina and Serbia.    The Sava 10 block holds three oil fieldsin the central-eastern sector - the Djeletovci, Ilaca and Privlaka fields (fenced off) â producing oil from the reservoirs in the Middle Miocene Vukovarska Formation. All three fields were put onstream in 1984. There is also the Vukovar oil field in the northern part of the licence, discovered in the mid-fifties and soon abandoned after producing an estimated 15,000 bo and deemed non-commercial, holding the reservoir in the Middle Miocene (Vukovarska Formation) below 1,500 m.  The latest exploration activity in the block dates back to April-May 2018, when Vermilion conducted a 2D seismic survey over the Sava 10 licence. Industry sources suggested that the survey delivered good image of the subsurface and the operator successfully interpreted several prospects for future drilling.
Vermilion Explorationâs second quarter 2019 report, recently released, states that its Croatian subsidiary Vermilion Zagreb Exploration d.o.o. tested new-field wildcat Ceric 1 in the Sava 10 (SA-10) licence in northeastern Croatia. The well yielded gas flow at a rate of 6.2 MMcf/d - stabilized flowing pressure of 1,376 psi on a 0.37â choke â from 1,167-1,177 m zone within the Upper Miocene Pannonian sandstone succession. 