Traditionally, mudstones (shales) have been of interest to the petroleum industry because they form seals or source rocks. In geophysical circles, mudstones have also been of interest because their sometimes pronounced velocity anisotropy can lead to imaging problems and because of overpressures that can be defined by other types of velocity anomalies. Only within the past decade, and due largely to advances in drilling and stimulation techniques, have mudstones been seriously regarded as reservoirs in their own right. Although mudstones form approximately 70% of sedimentary rocks, much remains to be learned about these fine-grained rocks. For example:

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