Petroleum Systems of Deep-Water Basins - Gulf Coast Section SEPM

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New Oceanographic Observations of the Gulf of Mexico Deep Waters Alexis Lugo-Fernandez Minerals Management Service Physical Sciences Unit (MS 5433) 1201 Elmwood Park Blvd. New Orleans, Louisiana 70123-2394 e-mail: alexis.lugo.fernandez@mms.gov Peter Hamilton Science Applications International Corporation 615 Oberlin Road Suite 100 Raleigh, North Carolina 27605 Walter R. Johnson Minerals Management Service, Environmental Studies Branch (MS 4041) 381 Elden Street Herndon, Virginia 20170-4817 Abstract Recent deepwater current observations in the Gulf of Mexico suggest this environment is more energetic than previously observed. Data and modeling results suggest that the Gulf of Mexico behaves as a two-layer system. Coupling of waters above 1,000 m to waters below is still unresolved and remains a topic of further research. The upper layer circulation is dominated by the Loop Current (LC), Loop Current rings (LCR), and smaller scale eddies. Recent data reveal a rich field of eddies of 30–150 km diameters that influence the LCR and shelf-edge currents. The lower layer circulation is less understood. Currents of ~30 cm/s vertically unchanged below 1,000 m, but showing near-bottom intensification interpreted as topographic Rossby waves (TRW) are reported. These waves have 20–30 day periods, wavelengths of 150–250 km, and propagate westward at about 9 km/day. Recent current measurements at 2,000 m reveal even stronger speeds (~90 cm/s) 11 m above the bottom and a small vertical shear below 1,000 m typical of TRW with periods of ~10 days and wavelengths of 70 km. In this lower layer, models show the presence of deep cyclone-anticyclone pairs that move westward and interact with the bottom topography, creating intense bottom currents. Direct observations of large furrows, active at present, suggest strong (~100 cm/s) near-bottom currents. The role of steep slopes in the generation of large amplitude TRW’s is at present unknown. It is also unknown if the observed strong ocean currents are responsible for the large furrows at the sea floor. 11
The Rio Muni Basin of Equatorial Guinea: A New Hydrocarbon Province Paul Dailly Kenny Goh Phil Lowry Gene Monson Triton Energy 6688 North Central Expressway Dallas, Texas 75206 e-mail: daillyp@tritonenergy.com Abstract The Rio Muni basin underlies the continental shelf of the west African republic of Equatorial Guinea, located between Gabon and Cameroon. The basin is situated above a section dominated by a northeast-southwest trending oceanic fracture zone and its continental extension. This fracture zone constitutes the boundary between the Equatorial Atlantic margin and the West African salt basin. Despite its location between the prolific hydrocarbon provinces of the Niger delta to the north and the Gabon coastal basin to the south, the Rio Muni basin has been overlooked by the industry for much of the last decade. Previous wells have proved a viable source rock, but no accumulations. Triton Energy licensed Blocks F & G in 1997 and drilled the Ceiba 1 discovery well in 1999, proving a new hydrocarbon system in the deep water, Late Cretaceous post rift sequence. Deformation by Santonian-Coniacian transpression caused uplift of the shelfal area and deposition of a thick, slope fan sequence. Contemporaneous salt deformation of rafted deposits and the development of a base of slope compressional belt are also evident. The resultant turbidite sequences form the reservoirs in the Ceiba discovery, which has been tested at 12,400 BOPD. Both Late Cretaceous and Tertiary turbidite reservoirs form exploration targets in the basin; these may be charged by a deep water source kitchen from which earlier, shelfal wells were shadowed. 12
Page 2 and 3: Petroleum Systems of Deep-Water Bas
Page 4 and 5: Foreword The search for petroleum t
Page 6 and 7: Gulf Coast Section Society of Econo
Page 8 and 9: Contributors to the Gulf Coast Sect
Page 10 and 11: Credits Book Layout, Cover Design,
Page 12 and 13: 10:00 a.m. Wood, Lesli J.: ........
Page 14 and 15: 3:30 p.m. Roberts, Harry H., Roger
Page 16 and 17: World-Wide Deep Water Exploration a
Page 18 and 19: Mesozoic Ultra-Deep Water Potential
Page 20 and 21: Regional Mapping and Maturity Model
Page 22 and 23: Basement Controls on Hydrocarbon Sy
Page 24 and 25: Kinematic Evolution of the Gulf of
Page 28 and 29: Examples of Deep-Water Salt Tectoni
Page 30 and 31: Exploration in Deep Water Basins…
Page 32 and 33: Stratigraphic and Tectonic Framewor
Page 34 and 35: Based on oil-to-seep correlations,
Page 36 and 37: Subsalt Exploration Trap Styles, Wa
Page 38 and 39: The Petroleum System of the Western
Page 40 and 41: The Northern Angolan Margin Imaged
Page 42 and 43: Mesozoic Carbonate Petroleum System
Page 44 and 45: Phase Changes: A Major Aspect of De
Page 46 and 47: The Past and Future Exploration Pot
Page 48 and 49: On the Importance of Understanding
Page 50 and 51: Obstacle and Sinks: Effects on Turb
Page 52 and 53: Potential Deep Water Petroleum Syst
Page 54 and 55: Capillary Seals as a Cause of Press
Page 56 and 57: Determination of Paleogeography and
Page 58 and 59: Gas Capillary Inhibition to Oil Pro
Page 60 and 61: Processes Impacting Deep Water, Sub
Page 62 and 63: Transtension Along an Ancient Linea
Page 64 and 65: Economic Potential of the Yucatan B
Page 66 and 67: Gulf of Cadiz (Western Spain): Char
Page 68: Complex Petroleum Systems Developed

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