A Global Overview of Fields and Discoveries in Deep-water Deposits
Stephen P. J. Cossey, Joseph R. J. Studlick, 2008. "A Global Overview of Fields and Discoveries in Deep-water Deposits", Atlas of Deep-Water Outcrops, Tor H. Nilsen, Roger D. Shew, Gary S. Steffens, Joseph R. J. Studlick
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Since initial exploration success more than a century ago in onshore California, more than 872 discoveries with total reserves >137 billion barrels oil equivalent (BBOE) have been made in deep-water deposits. A rapid increase in such discoveries began in the 1970s and more than 350 are expected in this decade based on historic trends.
More than 80% of these discoveries are in offshore basins. North America dominates the number of total discoveries as well as reserves but there is an increasing number of African and Brazilian discoveries and fields. Reservoir rocks range in age from Ordovi-cian to Pleistocene. However, more than 90% are in Cretaceous or younger rocks. Passive margins have been the setting for most of these accumulations, and most are in slope depositional environments. However, recent technological advances allowing drilling in deeper waters will lead to more discoveries in lower slope to basin depositional environments. Further statistics on hydrocarbons, reservoir drive, trap types, porosity, and hydrocarbon column heights are discussed from a commercially available database compiled by Cossey and Associates Inc.
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Atlas of Deep-Water Outcrops
Tor H. Nilsen, a red-haired Scandinavian who stood more than six feet tall, died October 9, 2005, at his San Carlos, California, home. This was after a valiant five-year fight with melanoma cancer. He was 63. His ashes were scattered at his family plot in Norway in 2006.
He was born in New York City on November 29, 1941, to Mollie Abrahamson and Nils Marius Nilsen of Mandal, Norway, and was the first of their children to be born in the United States. After graduating from Brooklyn Tech, he earned his B.S. in geology from City College of New York in 1962. While there, his prowess on the basketball court impressed a scout from the New York Knicks, but Tor went on to graduate school and earned his M.S. and Ph.D. degrees in geology from the University of Wisconsin at Madison in 1964 and 1967, respectively. His M.S. thesis was a study of Precambrian metasedimentary deposits in the Lake Superior area, and his Ph.D. thesis was a study of Devonian alluvial-fan deposits of the Old Red Sandstone in western Norway.
Dr. Nilsen’s principal expertise was in depositional systems analysis, stratigraphic analysis, and the relationships among tectonics, eustasy, and sedimentation. He began his industry career in 1967 as a research geologist with the Shell Development Company in Houston, Texas, and Ventura, California, where he worked on the tectonics and sedimentation of Tertiary shelf systems of coastal California. He subsequently spent two years with the U.S. Army Corps of Engineers as the Military