Trinidad gets rare onshore light oil discovery

By OGJ editors
HOUSTON, Feb. 16
-- Parex Resources Inc., Calgary, and partner Primera Energy Resources Ltd. have reported an onshore discovery Primera calls the first onshore light oil discovery in Trinidad in 50 years.

Snowcap-1, the second exploratory well drilled on the Cory Moruga block in south-central Trinidad, stabilized over 6 days on a three-point test at 578 b/d of 37° gravity oil and 4.6 MMcfd of gas from the primary objective Miocene Herrera formation at 4,597-4,603 ft. Tubinghead pressure at the end of the test was 600 psi.

The well tested at rates as high as 1,450 b/d and 6.2 MMcfd. The zone produced no water.

Deeper secondary targets, namely the Eocene and footwall Herrera zones, produced little or no hydrocarbons in commercial quantities (OGJ Online, Dec. 14, 2010). TD is 8,600 ft.

Appraisal drilling is required to determine the hanging wall Herrera reservoir areal extent, oil leg, gas cap structural positions, and potential hydrocarbon height.

Meanwhile, Parex Resources (Trinidad) is mobilizing a drilling rig back to the pair’s first well, Firecrown–1. Based on open hole wireline logs, mud logs, and cuttings samples, this well encountered hydrocarbon-bearing sandstones with oil shows at 6,600-7,200 ft and 8,150-8,275 ft in the Herrera. Drilling was suspended due to wellbore integrity problems.

The well will be deepened to the commitment depth of 10,500 ft to investigate deeper prospective horizons, following which all potentially productive zones will be tested including the Herrera.

Primera Energy said it has several additional “high impact,” seismically identified prospects on the block and is seeking regulatory approval for further exploratory drilling.

The company is also sourcing a drilling rig to resume drilling on its WD-4 block. The first well, PS 131 RD, will to go 5,600 ft and target the Lower Forest formation.

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