Four borehole televiewer logs were run in the Cajon Pass well, covering the test interval from 6250 ft to 6935 ft (1905 to 2114 m). The best image resolution was in the interval from 6711 to 6935 ft (2046 to 2114 m) where the drill bit size was 6-1/2 inches (16.5 cm). Above that section, the bit size was 8-1/2 inches (21.6 cm), and the tool was poorly centralized, resulting in lower resolution.Depth uncertainties were checked and adjusted using the drillers depths for the bottom of the casing at 6000 ft (1829 m), the hole size change at 6711 ft (2046 m), and fractures that correlated with those on the core at 6748 ft and 6515 ft (2057 and 1986 m).
An array of five wells was drilled in Mesozoic granitic rock for hydrological and geophisical investigations at Hi Vista, California. A 592 m-deep well is located in the center of the array and four 183 m-deep wells were drilled 14 m from it in each of the cardinal directions. Two hundred seventy-seven fractures were seen in televiewer logs of the deep well and three significant fracture sets were identified; a north-striking high-angle set, a northeast-striking high-angle set, and a low-angle set that dips to the west-southwest. Each of the shallow wells contained some fractures within these sets; however the distributions of fracture orientations varied from well to well. These different fracture orientations may help to explain why water levels between wells vary by as much as 50 m.When these fracture distributions are compared with those from three other deep holes in crystalline rock at Black Butte, Crystallaire, and Cajon Pass, a regional trend can be identified. Each of the wells has significant clustering associated with it. Two of the clusters identified at Hi Vista are well defined in more than one deep hole. Fracture frequency at Hi Vista increases with depth; that at Cajon Pass decreases with depth; and the fracture frequencies at Black Butte and Crystallaire show no strong systematic trend with depth.
Introduction 2 The pressure and temperature gauge 3 Gauge operating description 3 Kuster survey start-up procedure 3 The bundle carrier 4 Parameters measured by the Kuster gauges 4 Wireline assembly 6 Digitizing system 7 Kuster data filing system 7 Calibration procedures 7 Calibration table and schedule 8
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.