Borehole gravity meter surveys in drill holes USW G-3, UE-25p No. 1 and UE-25c No. 1, Yucca Mountain Area, Nevada
The borehole gravity meter (BHGM) measures a larger volume of rock than conventional logging tools and provides an independent measurement of the in situ bulk density. Drill holes USW G-3, UE-25p No. 1, and UE-25c No. 1 were logged with the BHGM and free-air gradient (FAG) measurements were made at UE-25p No. 1 and UE-25c No. 1. The BHGM data in these two holes were reduced using the measured FAG values. Windy conditions prevented measuring a FAG at USW G-3 and these data were reduced using the assumed normal value of 0.3086 mGal/m. At UE-25p No. 1 and UE-25c No. 1, respectively, the measured FAG values are 1.8 and 0.97% higher and the calculated densities are 0.07 and 0.04 mg/m{sup 3} higher than values calculated using the normal value. These calculated differences in density are not insignificant and indicate the need to measure the FAG at each logged hole. The interval densities calculated from the three BHGM surveys are presented herein. 7 references, 4 figures, 7 tables.
- Research Organization:
- US Geological Survey, Denver, CO (United States)
- DOE Contract Number:
- AI08-78ET44802
- OSTI ID:
- 59688
- Report Number(s):
- USGS-OFR-84-672; ON: DE85004344
- Resource Relation:
- Other Information: PBD: 1984
- Country of Publication:
- United States
- Language:
- English
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