By Jim Brooks
Petroleum geochemistry has grew to become out to be greater than one other step within the path to quantify geology and geosciences often. Petroleum geochemistry because it is this day might be the triggering occasion that brings the opposite branches of geosciences like sedimentology, stratigraphy, structural geology, geophysics and others to a fruitful synthesis as evidenced by way of built-in basin stories
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Additional resources for Advances in Petroleum Geochemistry. Volume 1
D o w , 1977; Waples, 1980) have ignored, either explicitly or implicitly, differences in oil-generation rates. This approach is undoubtedly an oversimplification that should be eliminated by further research. Definitive data on this problem are badly n e e d e d now. E. Pressure T h e role of pressure in oil generation has never been rigorously considered. McCoy p r o p o s e d long ago (1919) that pressure helps to transform solid THERMAL MODELS FOR OIL GENERATION 31 kerogen to liquid p e t r o l e u m .
For example, the oldest rocks depicted in Fig. 7 (300 M . Y . : lowermost burial history line) spent their first 80 M . Y. at t e m p e r a t u r e s far below their maximum p a l a e o t e m p e r a t u r e . T h e cooking that occurred during the first 80 M . Y . is therefore much less important than that which took place later. In an effort to take this factor into consideration, Lopatin (1969b) was the first to attempt to define an "effective heating t i m e " for oil generation. H e observed a good correlation between measured thermal maturity and the length of time spent at t e m p e r a t u r e s above 100°C.
0 —1 OIL BIT. A M V BIT. 5 45 LV BIT. 14 - S E M I ANTH. 5 16- — - 18 - A N T H . 5 CONDENSATE & W E T GAS CATAGENETIC METHANE — -20- FIG. 8. Level of organic metamorphism (LOM) as denned by Hood et al. (1975). Adapted with permission. with increasing t e m p e r a t u r e . Because of the simplifying assumptions employed in calculating effective heating time, H o o d and co-workers cautioned against putting too much faith in calculated L O M values. 0 10 EFFECTIVE HEATING TIME, MILLIONS O F YEARS 1—I ' ι 100 I I ι I 1000 FIG.