Yemen's Tasour field gets new pay, extension

A group led by DNO ASA, Oslo, found a new pay in Tasour field in the Masila basin in a well that extended the main field pay south into an area previously assumed to be below the oil-water contact.

By OGJ editors

HOUSTON, Sept. 27 -- A group led by DNO ASA, Oslo, found a new pay in Tasour field on Block 32 in the Masila basin in a well that extended the main field pay south into an area previously assumed to be below the oil-water contact.

The structurally high Tasour 7 cut full oil columns in Cretaceous Qishn S1A sandstone and the unspecified new pay just below Qishn, said partner TransGlobe Energy Corp., Calgary.

Tasour field went on production Nov. 3, 2000, and peaked at 12,500 b/d in February 2001. It averaged 8,187 b/d in 2001, and TransGlobe expects 7,200 b/d this year, consistent with predicted natural declines.

Due to Tasour's strong water drive and production history, the Qishn recovery factor used in 2001 was 45% compared with 20% assumed in 2000. Tasour 7 is expected to increase the field's reserves.

The group could drill 2-3 more appraisal wells at Tasour, and two of 11 seismically defined exploration prospects are ready for drilling on the 220-sq-mile block, where Trans-Globe has 13.8% interest while DNO and Ansan Wikfs (Hadramaut) Inc., San'a, Yemen, hold the rest.

On another project, the Yemeni affiliate of Vintage Petroleum Inc., Tulsa, Okla., has spudded the Osaylan 1 exploration well on the Alif/Lam prospect on Block S-1. Vintage operates the block with 75% interest, and Trans-Globe has 25% (OGJ, Mar. 13, 2000, p. 67).

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