Ekofisk oil field
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Ekofisk is an oil field in the Norwegian sector of the North Sea. Discovered in 1969, it remains one of the most important oil fields in the North Sea. Production began in 1971 after the construction of a series of off-shore platforms by Phillips Petroleum. Oil production is planned to continue until at least 2050.
In the mid-1980s the Ekofisk field as a whole and the platforms in particular were found to be suffering from an unexpected degree of subsidence. Detailed geological investigation showed that it was the result of delayed compactional diagenesis of the Chalk Formation reservoir rocks. As hydrocarbons were produced and replaced with water, the Chalk began to re-dissolve at microscopic high-pressure inter-grain contacts and redeposit in a more compact, lower porosity configuration. Total movements of several metres have been recorded, resulting in some staggeringly expensive remedial work.
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