Changes

* Geohistory analysis with proper gasification kinetics can usually predict at what depth accumulations have been gasified.

* Geohistory analysis with proper gasification kinetics can usually predict at what depth accumulations have been gasified.

* As a rule of thumb, oil should not be expected at subsurface temperatures > [[temperature::150°C]] or a maturation level much above 1.3% R_o. Dry gas accumulations can occur at shallower depths, but oil is not likely at greater depths.

* As a rule of thumb, oil should not be expected at subsurface temperatures > [[temperature::150°C]] or a maturation level much above 1.3% R_o. Dry gas accumulations can occur at shallower depths, but oil is not likely at greater depths.

* Gasification of oil in reservoirs is associated with the formation of pyrobitumen (<ref name=ch11r34>Tissot, B., P., Welte, D., H., 1984, Petroleum Formation and Occurrence, 2 ed.: New York, Springer-Verlag, 699 p.</ref> p. 460–461).

* Gasification of oil in reservoirs is associated with the formation of pyrobitumen.<ref name=ch11r34>Tissot, B., P., Welte, D., H., 1984, Petroleum Formation and Occurrence, 2 ed.: New York, Springer-Verlag, 699 p. 460–461</ref>

* Displacement of oil from a trap by gas is associated with asphaltene precipitates and/or relatively unaltered oil stain.

* Displacement of oil from a trap by gas is associated with asphaltene precipitates and/or relatively unaltered oil stain.

* Absence of an oil leg in the trap prior to charging by gas is indicated by the absence of oil stain with heavy molecular components.

* Absence of an oil leg in the trap prior to charging by gas is indicated by the absence of oil stain with heavy molecular components.