Western Nigeria wildcat finds oil in new basin

By OGJ editors

Afren PLC said its Ogo-1 well near shore western Nigeria is a large light oil discovery in the same Cretaceous sandstones that have yielded other significant discoveries along the West Africa transform margin.

Several high-potential formations remain to be drilled, Afren noted, with the well at 10,518 ft measured total depth, 10,402 true vertical depth, and headed for a final depth of 11,800 ft MD, 11,684 ft TVD. Ogo-1 is on the OPL 310 license not far east of Nigeria’s marine boundary with Benin.

It will then be sidetracked to test a new play of stratigraphically trapped sediments that pinch out onto the basement high targeting 124 million bbl of oil equivalent of gross P50 prospective resources.

Ogo-1 encountered a gross hydrocarbon section of 524 ft with 216 ft of net stacked pay. The well is testing a four-way dip closed structure in the Turonian, Cenomanian, and Albian sandstone reservoirs.

Afren said, “The well was targeting 78 million boe of gross P50 prospective resources, but based on evidence to date, targeted resources are likely to be significantly in excess of previous estimates. Further evaluation using wireline log analysis is currently under way …”

Economic interests in OPL 310 are Afren 40%, Optimum 30%, and Lekoil Ltd. 30%. Participating interests are Optimum 60%, Afren 22.86%, and Lekoil 17.14%.

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