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In siliciclastic hydrocarbon reservoir rocks, economic gas and oil production may depend on the attributes of natural fractures, and, with the advent of horizontal drilling, fractures are increasingly exploration and development targets; yet reliable information on such key fracture attributes as orientation (strike) is sparse because few fractures intersect vertical well bores. This paper describes how fracture strike can be documented on a bed-by-bed basis even in well bores where few or nodoi:10.1306/522b43e3-1727-11d7-8645000102c1865d fatcat:azrt4beu4zf5fp3lomarncyuem