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Journal of Petroleum Geology
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A REASSESSMENT OF THE RANGE OF KEROGEN MATURITIES IN WHICH HYDROCARBONS ARE GENERATED
J. D. Saxby, The ranges of vitrinite reflectance values, defining zones in which oil, gas generation occur, are examined from several points of view. Geochemical consideration of coalification reactions, kerogen compositions, iso-reflectance lines, spore colour, fluorescence, electron-spin resonance, extract data, reservoir temperatures point to the following approximate ranges: oil generation 1.0-2.0% Ro, wet gas and condensate 1.5-3.0% Ro, methane 2.0-5.0% Ro. Biogenic methane can be formed at Ro, hydrogen generation from kerogen appears to be possible above 5.0% Ro. These results point to hydrocarbon generation under hotter, deeper conditions than those proposed in most previous schemes. As a consequence, reflectance ranges are broadened for traces of vitrinite in possible reservoirs: oil Ro, methane Ro.
SEDIMENTOLOGY OF THE BRAE OIL FIELD, NORTH SEA: FAN MODELS AND CONTROLS
Dorrick A. V. Stow, Clive D. Bishop, Stephen J. Mills
THE PANGAEAN PARADOX: WHERE IS IT?
A. R. Crawford
GURI LIMESTONE, A NEW HYDROCARBON RESERVOIR IN SOUTH IRAN
Mansour S. Kashfi
THE NATURE OF THE UPPER 400 KM OF THE EARTH AND ITS POTENTIAL AS THE SOURCE FOR NON-BIOGENIC PETROLEUM
A. A. Giardini, Charles E. Melton, Richard S. Mitchell
LOWER CRETACEOUS LITHOSTRATIGRAPHY NE OF THE SOLE PIT AREA IN THE UK SOUTHERN NORTH SEA
S. Crittenden
Lithofacies distribution of the Permian-Triassic rocks in the Middle East: A Reply
Farooq A. Sharief