Advances in Petroleum Geochemistry. Volume 1 by Jim Brooks

By Jim Brooks

Petroleum geochemistry has became out to be greater than one other step within the path to quantify geology and geosciences mostly. Petroleum geochemistry because it is this present 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 via built-in basin reviews

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Pusey (1973), for example, claimed that his t e m p e r a t u r e threshold was applicable to rocks heated for periods ranging from 1 million to 200 million years. Albrecht and Ourisson (1969) and Wright (1980) proposed a slightly higher threshold t e m p e r a t u r e (70°C), whereas Kontorovich et al. (1967), Lopatin (1971, 1976), Lopatin and Bostick (1973), and B u n t e b a r t h (1979) believed that the t e m p e r a t u r e threshold lay at or below 50°C. g. Teichmùller, 1974) as favouring a minimum temperature of 90°C for oil generation, but the cited reference contains no such statement.

Most of the world's oil has b e e n generated from rocks of Mesozoic age. In order to separate the effects of time and t e m p e r a t u r e , extreme cases must be studied carefully: very young and very old sediments, and unusually high or low t e m p e r a t u r e s . T h e model must be forced to conform to the data from such examples. E x t r e m e examples have often been discarded in the past because their results did not conform with expectations. Palaeozoic sediments are typical; p o o r correlations between predicted and m e a s u r e d values have often been explained by changing heat flows through time.

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. Cornelius (1975a, b) 36 D. W. WAPLES distinguished between "exposure t i m e " (time spent at the maximum p a l a e o t e m p e r a t u r e ) and "cooking t i m e " (time spent reasonably near the m a x i m u m p a l a e o t e m p e r a t u r e ) , but did not define clearly his methodology for utilizing these time spans to calculate thermal maturity.

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