Notwithstanding the recent development of bore-hole fracture finding logging tools and techniques, it is desirable to use available old logs in order to determine the occurrence of fracture zones and the degree of fracturing of brittle rocks susceptible of becoming oil and gas reservoirs as a result of the shattering effect of certain tectonic deformation processes. Electric log techniques have been developed and tested on the Luling-Branyon-Buchanan field, Caldwell County, Texas, that permit the evaluation of the fracturing intensity. Hence, the fracturing index should be an important mapping parameter for the guidance of oil exploration and in oil field development in such chalk fields as the Austin, the Selma, the Annona, etc.; and in such sand fields as the Spraberry. Similar techniques may be used for finding and delineating fractured shale and basal schist fields. An important oil and gas exploration aspect for fractured reservoir rocks is point out where to expect the greatest probability of finding fracture development associated with certain tectonic deformations; model fracturing experiments and theoretical studies have permitted some preliminary conclusions.

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