Cygnus gas field reserve estimates continue to grow

Endeavour International Corporation has announced that the successful appraisal drilling in the western area of the Cygnus gas field in Block 44/11a has led to increased reserves and prospective resource estimates, and extended the field boundary to the north and west.

One of the largest fields discovered in Southern North Sea?

Preliminary estimates of Cygnus reserves and prospective resources could potentially be as high as 2 trillion ft3 of gas based on new well information, making Cygnus one of the largest gas fields ever discovered in the UK sector of the Southern North Sea.

The 44/11a-4 well was drilled to 12 207 ft vertical depth subsea, and encountered a high quality, gas saturated Leman sand reservoir, which was 54 ft in height, with a sand thickness of 130 ft gross and 85 ft net. The well was flow tested at a rate of 28 million ft3/d of gas.

Post operations

When operations cease on this well, the rig will be mobilised to the southern part of the Cygnus field to drill a sixth well, the 44/12a-E appraisal well. The Cygnus group plans to acquire a new fieldwide 3D seismic survey covering the expanded boundaries of the field.

Endeavour holds a 12.5% interest in Blocks 44/11a and 12a. License partners are GDF Suez E&P, the operator, and Centrica.

Read the article online at: https://www.oilfieldtechnology.com/drilling-and-production/21042010/cygnus_gas_field_reserve_estimates_continue_to_grow/