Jungslager, Eric (1998): Geological aspects of petroleum systems and related exploration plays in South Africa's Orange Basin

Leg/Site/Hole:
DSDP 40
DSDP 40 361
Identifier:
1998-064723
georefid

10.1306/1D9BDBC3-172D-11D7-8645000102C1865D
doi

Creator:
Jungslager, Eric
SOEKOR, Petroleum Licensing Unit, Parow, South Africa
author

Identification:
Geological aspects of petroleum systems and related exploration plays in South Africa's Orange Basin
1998
In: Anonymous, AAPG international conference and exhibition; abstracts
American Association of Petroleum Geologists, Tulsa, OK, United States
82
10
1928
Oil and gas and active source rocks are known at several stratigraphic levels and in several areas of the Orange Basin from exploration boreholes and from geochemical "Sniffer" survey anomalies, and inferred from seismic direct hydrocarbon indicators including bottom simulating reflectors and seismic chimneys. These hydrocarbon finds and indications, their migration routes from their likely source kitchens, the reservoir-seal-trap systems hosting them, together with the location of dry boreholes allow the delineation of petroleum systems and related plays of undiscovered accumulations. Excellent quality marine oil-prone source rocks of Aptian age have been encountered in the DSDP 361 well in the oceanic Cape Basin west of the Orange Basin. These source shales are known to extend eastward where they become mature and eventually become more gas-prone in the drilled proximal, structurally gentle areas of the Orange Basin. It is argued that an Aptian-sourced/Upper Cretaceous turbidite-reservoired oil system is at work in the undrilled distal, deeper water growth-fault and toe-thrust belts. Gas generated by the more proximal and deeply buried correlatives of these oil-prone shales in the active gas kitchen underlying the depocenter of the Orange Basin, as well as from Barremian shales, defines an Early Cretaceous gas system within which are found the Albian discoveries off South Africa, and the Barremian Kudu gas field off Namibia. Hauterivian source kitchens of both marine and lacustrine nature and which are known to be developed in several South West Gondwana rift and early post-rift basins and in a graben in the Orange Basin, are likely to be within the oil window in the southern part of South Africa's western margin and along a trend of grabens along the edge of the main depocenter in the north.
English
Coverage:Geographic coordinates:
North:-16.4000
West:1.0000East: 33.0000
South:-41.0000

Economic geology, geology of energy sources; Africa; Aptian; Atlantic Ocean; Barremian; boreholes; Cape Basin; clastic rocks; Cretaceous; Deep Sea Drilling Project; DSDP Site 361; genesis; geochemical anomalies; geochemical surveys; Kudu Field; Leg 40; Lower Cretaceous; Mesozoic; migration; Namibia; natural gas; offshore; oil and gas fields; Orange Basin; petroleum; petroleum accumulation; petroleum exploration; reservoir rocks; sedimentary rocks; shale; source rocks; South Africa; South Atlantic; Southern Africa; surveys;

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