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Geological Society, London, Special Publications; 1995; v. 88; p. 83-93;
DOI: 10.1144/GSL.SP.1995.088.01.06
© 1995 Geological Society of London

Mechanics, Dynamics and Geometry of Basin Inversion

Hydrocarbon habitat and classification of inverted rift basins

Duncan S. Macgregor

BP Exploration Operating Company, 4/5 Long Walk, Stockley Park, Uxbridge UB11 1BP, UK
BP Exploration, Kuningan Plaza South Tower, PO Box 2749 Jakarta Selatan, Indonesia

This shortened paper presents a brief analysis of the relationship between hydrocarbon distribution and the intensity of inversion in rift basins. For this purpose, three intergradational classes of rift were identified according to the intensity and areal extent of inversion-related uplift. Simple rifts, showing no significant inversion, are characterised by high success rates and dispersed hydrocarbon distributions. Locally inverted rifts, such as those showing restricted areas of uplift along faults, also show a high degree of petroleum retention and success, with the key success factor often being the relationship between timing of trap formation and petroleum charge. Regionally inverted rifts show lower success rates, failures being often attributable to a redistribution of hydrocarbons during inversion, with losses having occurred through biodegradation, surface erosion or seepage on surface penetrating faults. Both types of inverted rift frequently show a concentration of reserves in one large field.





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