These anomalies include potential direct hydrocarbon indicators
consistent with an active petroleum system.
The Tuatara trap bears a marked geological resemblance to that of the Maari oil field, situated some 80km to the north-west, and displays similar Direct Hydrocarbon Indicators
to those observed on seismic over Maari, which has produced at rates up to 40,000 barrels per day since commencing field production in late 2008.
The play has been defined by a combination of 3-D seismic and recent wells drilled in the immediate vicinity of Meridian's acreage, which confirm direct hydrocarbon indicators
visible on both 2-D and 3-D data sets owned by the company.
Premier has identified numerous prospects and leads which exhibit DHIs (direct hydrocarbon indicators
) on the existing 2D seismic data, significantly de-risking a potentially material gas play.
It is planned to drill ahead in 6" hole after the 7" casing is run to test deeper possible Direct Hydrocarbon Indicators
in the Pacoota and Goyder Formations as well as to test the top of a salt dome at a Total Depth of approximately 3,450m.
The prospect is based on a seismic anomaly within the Upper Messinian succession, which shows direct hydrocarbon indicators
conformable with a four way dip closure at the top of the Messinian succession in analogue to the North Sidi-Ghazy discovery, drilled by RWE Dea in 2008.
"The well has now drilled through the bottom cement plug at (top of approximately 2,300m) and it is planned to drill to to an approximate depth of 2,750m in 8.5" hole before running a full suite of electric logs and rotary sidewall cores." Following evaluation of the section from the base of the Mereenie Sandstone to the mid Pacoota Sandstone, 7" casing is planned to be run to the depth of 2,750m before contingently drilling ahead in 6" hole to a Total Depth of approximately 3,450m to evaluate possible Direct Hydrocarbon Indicators
(DHIs) in the lower Pacoota Sandstone, the Goyder Formation and the upper section of an interpreted salt dome.
Geologists will search for direct hydrocarbon indicators
in marine deposits using geochemical sampling and seismoacoustic profiling methods.