Romania - Brodina

Brodina appraisal area

San Leon holds 50% interest in the Brodina appraisal area and has the operator rights. Romgaz is holding the other 50% of WI. The appraisal area is based on the Voitinel gas discovery that was drilled in Q2 2010 and achieved 2.5 mmscf/d during flow test. The well was planned to test seismic amplitude anomalies terminating against a major thrust fault related to the Carpathian thrust and fold belt. The anomalies were interpreted to be turbidite or channel sands, deposited in the Carpathian Foredeep Basin in Miocene (Sarmatian) age and have been charged by biogenic gas. The well penetrated multiple sands in the Miocene section and two sand intervals appeared to be gas charged. With the lack of 3D seismic support at that time, proper reserve estimation was not possible therefore the well has been temporarily abandoned. SLE together with RomGaz acquired modern 3D seismic over the accumulation in 2013. The new seismic allowed our technical team to carry out a reliable reserve estimation as the accumulation mapped out as a strong and solid amplitude anomaly with clear boundaries. Based on the new 3D seismic, a series of map have been generated to support the reservoir simulation (depth map, porosity map, permeability map). Well log data and production test results have been used (together with seismic data) to verify the input parameters for the simulation. The calculated recoverable reserves are 3.65 Bcf (103 MMcm) in the mean case scenario.

The 3D seismic revealed other strong amplitude anomalies in the Fore-deep basin, which are similar to the proven discovery. Deeper high impact prospects with significant reserve size are also exist in the Mesozoic section, below the thrust belt representing good upside potential.

Prospect portfolio

The area covers multiple proven petroleum systems: a.) shallow biogenic gas system in Miocene sand-shale sequence from 400m to 2,000m; b.) Mesozoic oil and gas system in the depth range from 1,800m to 5,000m charged from source rock levels underneath the thrust belt; c.) Paleozoic (Silurian) gas system related to high TOC Silurian shale sequences at the depth range from 2,500 to 3,500m.

The Voitinel discovery tested 2.5 mmscfd of gas in the biogenic gas petroleum system. Other Voitinel look-a-like amplitudes (Hydra, Hydra North, Horodnic, Sub Thrust) have been identified in the same petroleum system. The prospects are interpreted to be gas charged turbiditic and channel sands. These are represented by strong seismic response with significant AVO signature comparable to the proven gas sand.

SLE is planning to execute a 1 + 1 well drilling program starting Q4 2015 to test the HC potential of the two best prospects together with our partner Romgaz.

Brodina 1 page

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