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Geological Society, London, Special Publications; 2003; v. 207; p. 275-283;
DOI: 10.1144/GSL.SP.2003.207.01.14
© 2003 Geological Society of London

Application of fluid inclusion studies to understanding oil charge, Pre-Salt succession, offshore Angola

J. Parnell & H. Chen

Department of Geology and Petroleum Geology, University of Aberdeen, King’s College, Aberdeen, AB24 3UE, UK

Fluid inclusion studies in the Pre-Salt succession of the Kwanza Basin show that valuable information can be obtained regarding fluid migration, including oil charge. A pilot study demonstrates that oil inclusions are widespread in both cements and healed microfractures, and that measurements can be made of their entrapment temperature, fluorescence characteristics, API gravity determination and bulk organic geochemistry. Successive populations of inclusions show changes of temperature with time, which give an insight into thermal history and emphasize the importance of hot fluids in the region. Multiple populations of oil inclusions offer the potential of reconstructing the evolution of oil chemistry and, in particular, the origin of mixed oils.