In 1960 Landes et al wrote “Commercial oil deposits in basement rocks are not geological ‘accidents’ but are oil accumulations which obey all the rules of oil sourcing, migration and entrapment; therefore in areas of not too deep basement, oil deposits within basement rocks should be explored with the same professional skill and zeal as accumulations in the overlying sediments.” Although hydrocarbon accumulations in crystalline or basement rocks are usually found by serendipity rather than design, they can be very prolific if a pervasive fracture system exists. The tenet of this book is that hydrocarbons located in and around ‘hard...

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