Geological Society London Petroleum Geology Conference series · 1993 · 52 citations · 0 references
EngineeringEarth SciencesGeologyPetroleum GeologyReservoir CharacterizationReservoir EngineeringPermeability CharacterizationPermeability EstimationReservoir GeologyShale Gas GeologyShale Gas ReservoirsUnconventional Reservoir EngineeringHorizontal PermeabilityPorosityPorosity In SandstonesRecoverable Reserve EstimationReservoir DescriptionSandstone Reservoir AccumulationShale Reservoir Geology
The Caister Gas Fields are located in Block 44/23a, within the Silver Pit Basin area of the Southern North Sea Basin and comprise a Bunter accumulation overlying a Carboniferous accumulation. The Carboniferous structure is a faulted northwest–southeast-trending anticline, bounded to the northeast by a major reverse fault. The reservoir is formed of early Westphalian B braided channel sandstones, the thickness of which varies from 20–50 m over the field. Porosity is fair with an average of 11%. Average horizontal permeability is 5 mD, although permeabilities up to 400 mD are measured. The Bunter structure is a simple, unfaulted, elongate northwest–southeast-trending dome, with seal provided by the overlying Haisborough Group saliferous shales. The sheet-flood reservoir sandstones, with a thickness of 150 m over the field, have an average porosity of 21% and an average horizontal permeability of 100 mD. Combined initial gas in place is estimated at approximately 400 BCF with recoverable reserves in the order of 300 BCF.