Geology

Chinarevskoye Field is a multi-formation structure. It has tested hydrocarbons at significant rates from (i) the Lower Permian horizons at 2,700m to 2,900m, represented by limestone and dolomitic limestone; (ii) limestone of the Lower Carboniferous Tournaisian formation at approximately 4,200m to 4,900m depth with a gross thickness of about 200m; (iii) the middle Devonian Givetian horizons at approximately 4,800-5,000m depth, represented by sandstone with carbonate cement; and (iv) the middle Devonian Biski and Afoninski formations at a depth of approximately 4,850-5,000m with a gross thickness of 200m and represented by limestone and dolomitic limestone.

Oil was found in the Lower Permian, Tournaisian and Givetian (Mullinski) reservoirs. Gas condensate was found in the Tournaisian and Biski, Afoninski and Givetian (Ardatovski) reservoirs.