The conventional prospect charge is almost always evaluated thanks to basin model. They allow the explorationist to compute subsidence history, source rock maturation and fluid migration and accumulation versus time. At the beginning of the gas shale exploration success story, dynamic trial and error approaches have been common, apparently without too much of geological input in the decision. However, careful basin analysis may help to predict where the source rocks have the adequate mineralogy to be frac and the adequate TOC and richness to generate gas. The temperature, pressure and TOC versus time could be modeled and therefore the adsorbed volume of gas that have to be added to the free one in the porosity.


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