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

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Based on oil-to-seep correlations, we can demonstrate: 1. That most piston cores 100,000 are truthable seepage. 2. Biomarker signatures of most piston core extracts having
The Depositional Regime on the Abyssal Plain of the Congo Fan in Angola D.G. Evans WesternGeco London doug.evans@westerngeco.com Abstract The Miocene channel play of offshore Angola contains the recent giant discoveries of Girassol, Dahlia, etc. From recent 3D surveys that extend across the salt front onto the abyssal plain in the Outer Congo Fan, it can be seen that this play can now be continued out into theultra-deep water into a new highly prospective frontier area. This presentation covers this area’s prospectivity and the use of the models generated here in the salt province. The Congo Fan of Angola shows evidence of extensive sand deposition from the Oligocene onwards. This sand deposition extends beyond the current exploration targets in the salt diapir province onto the abyssal plain, an area that has been covered by recent 3D seismic data sets. By using these data, the morphology of differing styles of sand deposition can be shown in a variety of ways including amplitude extraction, timeslices, opacity, and 3D visualisation. All these methods work well in this area because the strong amplitude/acoustic impedance contrast between sand and shale is combined with the approximately flat-lying nature of the abyssal plain. These factors allow the depositional morphologies to be shown without the influence or bias of interpretation. In this province of offshore Angola, it can be also demonstrated that the Cretaceous and early Tertiary on the abyssal plain shows little or no seismic evidence of sand deposition. However, this section is a prime candidate to contain mature source rocks, the evidence for which can be demonstrated by the clear ‘DHIs’ seen in the overlying sands. Micro-faults that act as hydrocarbon migration conduits can be seen on the data. The abyssal plain is at first sight the ultimate location for the ‘subtle’ (i.e., stratigraphic) trap; however, closures can also be shown to exist as drapes over basement features and allochthonous salt bodies. The models generated on the abyssal plain can be applied in the far more heavily structured salt diapir province, to provide an understanding of the channel and fan systems in this area. The multiple DHIs here, combined with numerous sands and four-way dip closures suggest that this is a highly prospective area. 20
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 26 and 27: New Oceanographic Observations of t
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 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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