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The AAPG/Datapages Combined Publications Database
Journal of Petroleum Geology
Abstract
Journal of Petroleum Geology, vol.
REFLECTANCE, PART 2.
DERIVATION AND TESTING OF A
KINETIC MODEL FOR SUPPRESSION
During the maturation of normal (unsuppressed) vitrinite, the volatiles generated are expelled via the microporous network; the expulsion efficiency is not limited by the capacity of the microporous network. In hydrogen-rich (suppressed) vitrinites, excess volatiles saturate the microporous network, restricting further aromatisation and condensation processes within the vitrinite, which results in suppression of VR. Kinetically, this has been modelled by using a variable pre-exponential or A value. Two versions of a kinetic model of vitrinite maturation (SMod-1 and SMod-2) have been prepared, based on the amount of suppression predicted by HI-VR calibration models published by Lo (1993) and Samuelsson and Middleton (1998).
Two case studies, involving wells Bunga Orkid-1 (Malay Basin) and 20/3-4 (Outer Moray Firth, North Sea), are discussed. Both wells contain suppressed VR values; well 20/3-4 is also overpressured and contains VR data that are both retarded and suppressed. The application of the SMod model to the wells enables heat flow histories derived from tectonic (rift) histories to be used for the prediction of VR data, although in the case of well 20/3-4, the use of a pressure retardation model was also required. Complementary evidence to support the use of the heat flow history applied to well 20/3-4 is provided by palaeotemperature data obtained from diagenetic concretions.
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*Advanced Geochemical Systems Ltd, Towles Fields, Burton on the
Wolds, Leicestershire, LE12 5TD.
email: [email protected]
End_Page 475------------------------
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