Apache Corporation and Total S.A. have made a ‘significant’ oil discovery at the Maka Central-1 well on Block 58 offshore of Surinam.
The well was drilled using the drillship Noble Sam Croft, with Apache as operator holding a 50 per cent working interest and Total holding a 50 per cent working interest.
Apache announced on Tuesday that Maka Central-1 successfully tested for the presence of hydrocarbons in multiple stacked targets in the upper Cretaceous-aged Campanian and Santonian intervals and encountered both oil and gas condensate.
The formation evaluation program included logging-while-drilling and wireline logs, formation pressures, and preliminary core and fluid analysis.
Together with future appraisal wells, this data will be used to quantify the resource in the Campanian and Santonian formations.
The company said the shallower Campanian interval contains 50 metres of net hydrocarbon-bearing reservoir. Preliminary fluid samples and test results indicated light oil and gas condensate with API gravities between 40 and 60 degrees.
The deeper Santonian interval contains 73 metres of net oil-bearing reservoir. Preliminary fluid samples and tests results indicate API oil gravities between 35 and 45 degrees.
The Maka Central-1 also targeted a third interval, the Turonian, a geologic analogue to oil discoveries offshore of West Africa.
Prior to reaching this interval, Apache noted that the well encountered significantly over-pressured, oil-bearing reservoirs in the lower Santonian, and the decision was made to conclude drilling at approximately 6,300 metres.
The pressures encountered in the lower Santonian are considered a positive sign for the Turonian, and future drilling is expected to be conducted to test this interval.
Apache CEO and President, John J. Christmann, said they are pleased with the results from Maka Central-1.
“The well proves a working hydrocarbon system in the first two play types within Block 58 and confirms our geologic model with oil and condensate in shallower zones and oil in deeper zones.”
“Preliminary formation evaluation data indicates the potential for prolific oil wells,” Mr Christmann said, “additionally, the size of the stratigraphic feature, as defined by 3-D seismic imaging, suggests a substantial resource.”
He added that Block 58 (which comprises approximately 1.4 million acres in water depths ranging from less than 100 metres to more than 2,100 metres) offers significant potential beyond the discovery at Maka Central.
“We have identified at least seven distinct play types and more than 50 prospects within the thermally mature play fairway,” Mr Christmann said.
“In partnership with Total, we look forward to advancing both exploration and development of discoveries on the block.”
The Sam Croft will drill the next wells in Block 58, starting with the Sapakara West prospect.
Sapakara West-1, located approximately 20 kilometres southeast of the Maka Central discovery, will test oil-prone upper Cretaceous targets in the Campanian and Santonian intervals.