Ceuta-Tomoporo Field, Venezuela
Ceuta-Tomoporo field is located in the southeastern part of the Maracaibo basin in western Venezuela. It has an area of 320 km2 and is producing light- to medium-grade oil. The structural framework is characterized by a major left-slip fault, and oil accumulations are associated with extensive compressional structural features. There are indications that the deposition of Eocene sediments has been controlled by normal faulting in some areas and that a period of shortening altered the character of some faults during the late Eocene, or even later. The main producing intervals are shallow water marine or fluviodeltaic sands of Miocene or Eocene age, with porosities ranging from 12 to 17% and a potential production rate of up to 3500 BOPD per well from depths of about 17,000 ft (5180 m). Most of the oils accumulated in the basin have been derived from the organic-rich, highly oil-prone Cretaceous La Luna source rocks. The reservoirs seem to contain mixtures of hydrocarbons that probably are the results of migration from a common drainage area at different times.
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,