Based on seismic and petrophysical analyses, the Company believes that the Ogai structure is a faulted anti-cline that is over 5 square km in areal extent. It was penetrated by two wells; Ogai No. 30 and Ogai No. 1, which were drilled in the 1980s by the Soviets.
Well Ogai No. 30 is approximately 2 km west of Ogai No. 1, and is located at the crest of the structure. It was drilled only to the Lower Cretaceous Formation, and subsequently perforated by the Soviets from 1,051m to 1,054m and from 1,134m to 1,139m. The well flowed on test at 135 bopd on a 9mm choke and 365 bopd on a 5mm choke, respectively.
Well Ogai No. 1 is located on the northeast flank of the structure and indicated over 200 m of clean sands in the Cretaceous, Jurassic, and Triassic horizons on well logs. While the Cretaceous and Triassic formations were interpreted as oil bearing, they were left untested by the Soviets. The Company re entered the well but due to down hole obstructions, was only able to perforate and test the Lower Cretaceous horizon from 1,176m to 1,182m. This interval flowed clean 20 degrees API sweet crude at 450 bopd on a 13mm choke during a 48-hour test period. Currently the well is flowing at 140 bopd on a 7 mm choke and, based on pressure transient test analyses indicating severe near well bore formation damage, is believed to be capable of substantially higher inflow.
Well Ogai No. 18 is being drilled from an expanded pad constructed at the Ogai No. 1 well site. It will be directionally drilled a total distance of 3200 m towards Ogai No. 30 at the crest of the Ogai structure. The well will be drilled to the Triassic formation at a final vertical depth of approximately 2850 m. As a result, the Company believes this well will be able to test the sand packages identified on well logs at down dip Ogai No. 1 as they gain structure. Well Ogai 18 is expected to take approximately 60 days to drill and test.
"This is a significant well for our Company." stated Dr Harunoglu, the Company's CEO and President, "The Ogai Field is a large structure of which we are currently producing oil from the shallow Cretaceous horizon. In a sense, Well Ogai No. 18 is an infill well for this zone which we believe will yield significant production. However, the true importance of this well is the opportunity it presents to test a sizeable package of sands as they climb to the crest of the Ogai structure. We are encouraged by well analysis showing oil in the deeper Triassic formation and by offsetting fields surrounding our Morskoe Block which are highly productive from these lower horizons."
Big Sky Energy Corporation is a US junior oil and gas company currently operating in Kazakhstan's renowned pre-Caspian Basin.
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