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The AAPG/Datapages Combined Publications Database
AAPG Special Volumes
Abstract
Petroleum
System in the Southern Gulf of Mexico,
Onshore and Offshore Mexicofrom:
Petroleum Systems
-Chapa
Petroleum Geologists. All rights
reserved.Pimienta-Tamabra(!)--A Giant Supercharged Petroleum
System in the Southern Gulf of Mexico, Onshore and Offshore Mexico
Leslie B. Magoon
Applied Geology, Sequim, Washington, U.S.A.
Travis L. Hudson
Instituto Polit
cnico Nacional, Mexico City, Mexico
Harry E. Cook
U.S. Geological Survey, Menlo Park, California, U.S.A.
ABSTRACT
petroleum system in the southern Gulf of
Mexico with cumulative production and total reserves of 66.3 billion barrels of oil and
103.7 tcf of natural gas, or 83.6 billion barrels of oil equivalent (BOE). The
effectiveness of this system
results largely from the widespread distribution of good to
excellent thermally mature, Upper Jurassic source rock underlying numerous stratigraphic
and structural traps that contain excellent carbonate reservoirs. Expulsion of oil and gas
as a supercritical fluid from Upper Jurassic source rock occurred when the thickness of
overburden rock exceeded 5 km. This burial event started in the Eocene, culminated in the
Miocene, and continues to a lesser extent today. The expelled hydrocarbons started
migrating laterally and then upward as a gas-saturated 35-40
API oil with less than 1 wt.% sulfur and a
gas-to-oil ratio (GOR) of 500-1000 ft3/BO. The generation-accumulation
efficiency is about 6%.
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