Abstract
The [Formula: see text] storage operation at Sleipner in the Norwegian North Sea provides an excellent demonstration of the application of time-lapse surface seismic methods to [Formula: see text] plume monitoring under favorable conditions. Injection commenced at Sleipner in 1996 with [Formula: see text] separated from natural gas being injected into the Utsira Sand, a major saline aquifer of late Cenozoic age. [Formula: see text] injection is via a near-horizontal well at a depth of about 1012 m below sea level (bsl) some 200 m below the reservoir top, at a rate approaching 1 million tonnes (Mt) per year, with more than 11 Mt currently stored.
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