Early theories about the controlling principle of petroleum occurrences were often limited in concept in that they mainly addressed the question of ‘where’ accumulations were located. It has become clear during the past 20 years, that to be able to answer the question where? it is also necessary to evaluate why, when and how much petroleum is present in a basin, and to understand and establish the generation, migration and accumulation processes. This understanding is essential if we are to improve our petroleum exploration success ratio.
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