US oil and gas explorer Anadarko Petroleum has discovered light oil at the Ntomme-2A exploration well on the Deepwater Tano block, offshore Ghana.

The Ntomme-2A appraisal well is located 4km south of the Tweneboa-3 sidetrack and encountered 128 net feet of natural gas pay in excellent quality sandstone reservoirs, according to Anadarko. Fluid samples recovered from the Ntomme-2A well indicate oil of 35°API gravity.

The Ntomme-2A appraisal well was drilled to a total depth of 12,810ft in a water depth of 5,675ft. Once operations are complete, the company will install gauges in the Tweneboa-3 sidetrack prior to a planned drill stem test at Ntomme-2A.

Anadarko senior vice-president Bob Daniels said that finding a significant light oil accumulation is an excellent result that enhances the value of the Greater Tweneboa, Enyenra and Ntomme (TEN) complex.

"Our 3D seismic modelling, coupled with the pressure data collected from the Ntomme-2A and Tweneboa-3 sidetrack wells, indicates the potential for an oil column of more than 400ft below the gas-condensate accumulation encountered in the Tweneboa-3 sidetrack well," said Daniels.

Anadarko and its partners Tullow Oil, Kosmos Energy, Sabre Oil & Gas Holdings and the Ghana National Petroleum Corporation will incorporate this new information into its ongoing programme as they advance the development of the TEN complex.

Tullow operates the block with a 49.95% working interest, while Kosmos and Anadarko Petroleum each own an 18% stake.