--> Abstract: Volumetric Compositional Balance of Generated and Entrapped Petroleum Compounds on the Franklin Field (North Sea), by M. Gaulier, J. M. Vandenbroucke, F. Behar, J. L. Rudkiewicz, S. Drouet, F. Brigaud, S. Duppenbecker, and A. Vear; #90942 (1997).
[First Hit]

Datapages, Inc.Print this page

Abstract: Volumetric compositional balance of generated and entrapped petroleum compounds on the Franklin Previous HitfieldNext Hit (Previous HitNorthNext Hit Previous HitSeaNext Hit)

GAULIER, M.; J.M. VANDENBROUCKE; F. BEHAR; J.L RUDKIEWICZ; S. DROUET; F. BRIGAUD; S. DUPPENBECKER; A. VEAR

The Franklin Previous HitfieldNext Hit in the Previous HitNorthNext Hit Previous HitSeaNext Hit exhibits high temperature and high pressure that induced an unconventional charge history. During an EU supported Thermie project, we investigated the formation and thermal stability of petroleum compounds in this Previous HitfieldTop. Based on seismic data, a 3D data set described the petroleum system. Through combined decompaction and maturity modeling of the Kimmeridge source rock, the timing of structuration and the change in trap size resulted in volume estimations of the generated and trapped hydrocarbons.

The geochemical studies of the oils and the typing of the source rock indicated marine type II organic source. Kerogen cracks to: methane (C1), wet gas (C2-C5), light saturates (C6-C14SAT), light aromatics (C6-C14ARO), heavy saturates (C15+SAT), heavy aromatics (C15+ARO) and NSO compounds (C15+NSO). The calculated volume of each class generated by the source rock has been compared to actual observations in the reservoir.

We correctly estimated the light hydrocarbons and the C15+SAT with discrepancies lower than 20%, in good agreement with predicted migration efficiency from laboratory measurements. C2-C5 is overestimated probably due to losses through the cap-rock of the reservoir. Methane is significantly underestimated, due to difficulty in estimating the amount of secondary cracking. C15+ARO and C15+NSO show a strong deficit: almost no NSO are found in the oil. This clearly indicates the importance of retention phenomena in the source rock, losses along migration pathways and secondary cracking.

AAPG Search and Discovery Article #90942©1997 AAPG International Conference and Exhibition, Vienna, Austria