Abstract
AbstractVolcaniclastics have not as yet been considered prime hydrocarbon exploration targets. This is because they contain a high proportion of mechanically and mineralogically unstable components which generally cause a faster deterioration in reservoir quality upon burial than is found in siliciclastics. Also, their complex mineralogical composition makes the burial-related diagenesis more difficult to understand. However, under favourable circumstances—such as devitrification at shallow depth, leaching of unstable particles, fracturing, or reworking—volcaniclastics may act as good reservoir rocks. Both favourable and unfavourable case histories are discussed.
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