Abstract
Depth-wise, the bulk of gas and oil develops at 2 km, respectively; time-wise, gas antedates oil. The main phase of the generation of gas is characteristically of short duration, with the appropriate lithologic controls of both generation and conservation, contingent upon steady and not too slow subsidence of the sediments and a relatively rapid burial of the gas-generating horizons under a heavy load. In the case of oil, the main phase lasts longer than for gas, quick subsidence is not so essential, and lithologic conservation controls may be taken for granted, provided that the traps must already be in place by the time emigration of liquid hydrocarbons from the source rocks is about to begin. The same conditions which favor the main oil phase are adverse to progress of the main gas phase (and vice versa). The main phase intensities vs. depth relations illustrate further the spatial 3-dimensional segregation of the oil-bearing from the gas-bearing zones and the hydrocarbon accumulations therein.
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