The Kilmar Field, part of the Tors complex (Kilmar and Garrow fields), was discovered in 1992 and is located on the northern margins of the Southern North Sea Basin. Gas is produced from Namurian sandstones, at a depth of 11 000 ft, from a 25 km² closure at the Base Permian level. The reservoir was deposited as a series of stacked channel sandstones in a fluvio-deltaic setting. Seismic imaging of intra-Carboniferous strata is limited, so mapping of individual bodies of sandstone is not achievable. The development philosophy has been to maximize the drilled lengths of specific reservoir units and to contact multiple sandstone bodies by drilling long, high-angle, multi-bore production wells. The sandstones are of low to medium porosity and permeability, supplemented by connection through a fracture network. At project sanction in 2005, the combined gas-in-place resource in Kilmar was estimated to be 311 bcf and a total of 75 bcf gas recovery from three wells was forecast. Cumulative gas production to date is 69 bcf. Whilst the gas-in-place has changed little, the distribution has changed between segments. The recovery factor for the field is 24%. Infill drilling opportunities have been identified but are gas price dependent.