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ABSTRACT: PIT (Petroleum Inclusion Thermodynamic): a new Modelling Tool for the Characterization of hydrocarbon fluid Inclusions from volumetric and microthermometric Measurements

Thiery, Régis1, Jacques Pironon2, Frédéric Walgenwitz3, and François Montel3
(1) B. Pascal University, Clermont-Ferrand, France
(2) CNRS - UMR G2R, Vandoeuvre-lès-Nancy, France
(3) Elf Aquitaine, Pau, France

A recent technique, the confocal scanning laser microscopy, allows one to measure accurately the bubble filling degree (Fv) of oil fluid inclusions as a function of the temperature (Pironon et al., 1998). These data, combined with measurements of homogenization temperature (Th), give us new constraints for characterizing individually hydrocarbon fluid inclusions.

For this purpose, a new modelling tool, PIT (Petroleum Inclusion Thermodynamic), based on applied thermodynamics of natural oils, has been constructed for interpreting volumetric (Fv) and microthermometric (Th) measurements obtained individually on hydrocarbon fluid inclusions.

The software allows one 1) to reconstruct the paleo-thermobarometric trapping conditions of oils, and 2) to understand (Fv-Th) differences among a population of fluid inclusions in terms of various pre- or post-trapping processes (inclusion stretching, oil mixing, gas demixing, oil leaching by a gas, ...).

Pironon et al., Eur. J. Min., 10, 1143-1150 (1998).

AAPG Search and Discovery Article #90913©2000 AAPG International Conference and Exhibition, Bali, Indonesia