The Gullfaks Field
The Gullfaks giant oil field in the Norwegian sector of the North Sea was discovered in 1978. The Gullfaks field contains oil reserves on the order of 230 million standard m3.
Gullfaks represents the shallowest structural element of the Tampen spur. It was formed during the Upper Jurassic to Lower Cretaceous as a sloping high, with a westward structural dip gradually decreasing toward the east. The major north-south-striking faults, with eastward-sloping fault planes, divide the field into several rotated fault blocks. The central and eastern parts of the structure were eroded by the Early Cretaceous transgression.
The reservoir sands are the Middle Jurassic delta-deposited Brent Group, the Lower Jurassic shallow marine sandstones of the Cook Formation, and the Lower Jurassic fluvial channel and delta plain deposits of the Statfjord Formation.
The Brent reserves in the western part of the field are currently being developed from the Gullfaks A and Β platforms, and the eastern part is being developed from a third platform, Gullfaks C. Water injection is the major drive mechanism, maintaining the reservoir pressure above the bubble point.
One of the most important factors in the reservoir development of the Gullfaks field has been the effect of fault transmissibilities on lateral and vertical pressure distributions.
Figures & Tables
The success of Memoir 14 and the worldwide interest shown for data on giant fields prompted AAPG to schedule a symposium on giant fields at the end of each subsequent decade. The 1968-78 symposium was held in Houston, Texas, April 1-4, 1979, and the papers were published in AAPG Memoir 30, December 1980.
The Stavanger Conference "Giant Oil and Gas Fields of the Decade: 1978-1988" was held in Stavanger, Norway, September 9-12, 1990, and is a continuation of the Giants of the Decade series.
Scientific studies and projections of future world energy demand indicate that although alternative-energy fuel sources must be actively pursued and developed, there also must be adequate petroleum supplies to bridge the gap. For the international petroleum industry, the years covered by this conference, 1978-88, were complex. They were years of boom and bust. The world's energy consciousness was boosted sharply by the effects of the 1979 Iranian revolution and the resulting embargo, which sent world oil prices to record heights. Global petroleum exploration soon surged, leading to the industry's all-time drilling high in 1981. Then came the oil price collapse in 1985, and the following years were characterized by falling oil prices and drastic budget cuts for exploration and development.
Although exploration dropped sharply during the latter part of the decade, there was a steady flow of giant oil and gas field discoveries. Using the giant field designation criteria of 500 million bbl of oil recoverable for fields in Asiatic Russia, North Africa, and the Middle East,