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Title: Geology, drilling, and some hydrologic aspects of seismic hazards program core holes, Los Alamos National Laboratory, New Mexico

Abstract

As part of the Los Alamos National Laboratory's Seismic Hazards Investigations Program, we have cored four holes, as follows: SHB-I at TA-55 to 700 feet; SHB-2 at TA-3 to 200 feet; SHB-3 at TA-16 to 860 feet; and, SHB-4 at TA-18 to 200 feet. In that the near-surface seismic velocity structure of the holes is the subject of other reports, we describe here the lithologies, general aspects of drilling, and some hydrologic implications of the core holes. All four holes penetrated variably welded Tshirege Member of the Bandelier Tuff. Beneath two deeper holes encountered thick sequences of epiclastic sands and gravels, with minor interbeds of Cerro Toledo Rhyolite, on top of the dominantly nonwelded Otowi Member of the Bandelier Tuff. Beneath the Otowi was basalt at TA-55 and Puye Formation sands and gravels at TA-16. Two of the core holes (SHB-3 at TA-16 and SHB-4 at TA-18) appear to have encountered groundwater. The holes were all continuously cored with conventional wireline diamond coring techniques. Maintaining high percentage core recovery in nonwelded tuff and loose formations with air as the circulating fluid proved impossible. Light muds, however, improved recovery in these zones considerably. A variety of bits were tested, but nonemore » yielded consistent results in the alternating hard and soft rock conditions found beneath the Laboratory.« less

Authors:
 [1]; ;  [2]
  1. Los Alamos National Lab., NM (United States)
  2. Woodward-Clyde Consultants, Oakland, CA (United States)
Publication Date:
Research Org.:
Los Alamos National Lab., NM (United States)
Sponsoring Org.:
USDOE; USDOE, Washington, DC (United States)
OSTI Identifier:
7368503
Report Number(s):
LA-12460-MS
ON: DE93011473
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; LANL; SEISMICITY; DRILLING; GEOLOGY; GROUND WATER; HYDROLOGY; LITHOLOGY; ROCKS; STRATIGRAPHY; TUFF; HYDROGEN COMPOUNDS; NATIONAL ORGANIZATIONS; OXYGEN COMPOUNDS; PETROLOGY; US DOE; US ORGANIZATIONS; WATER; 580000* - Geosciences

Citation Formats

Gardner, J N, Kolbe, T, and Chang, S. Geology, drilling, and some hydrologic aspects of seismic hazards program core holes, Los Alamos National Laboratory, New Mexico. United States: N. p., 1993. Web.
Gardner, J N, Kolbe, T, & Chang, S. Geology, drilling, and some hydrologic aspects of seismic hazards program core holes, Los Alamos National Laboratory, New Mexico. United States.
Gardner, J N, Kolbe, T, and Chang, S. Fri . "Geology, drilling, and some hydrologic aspects of seismic hazards program core holes, Los Alamos National Laboratory, New Mexico". United States.
@article{osti_7368503,
title = {Geology, drilling, and some hydrologic aspects of seismic hazards program core holes, Los Alamos National Laboratory, New Mexico},
author = {Gardner, J N and Kolbe, T and Chang, S},
abstractNote = {As part of the Los Alamos National Laboratory's Seismic Hazards Investigations Program, we have cored four holes, as follows: SHB-I at TA-55 to 700 feet; SHB-2 at TA-3 to 200 feet; SHB-3 at TA-16 to 860 feet; and, SHB-4 at TA-18 to 200 feet. In that the near-surface seismic velocity structure of the holes is the subject of other reports, we describe here the lithologies, general aspects of drilling, and some hydrologic implications of the core holes. All four holes penetrated variably welded Tshirege Member of the Bandelier Tuff. Beneath two deeper holes encountered thick sequences of epiclastic sands and gravels, with minor interbeds of Cerro Toledo Rhyolite, on top of the dominantly nonwelded Otowi Member of the Bandelier Tuff. Beneath the Otowi was basalt at TA-55 and Puye Formation sands and gravels at TA-16. Two of the core holes (SHB-3 at TA-16 and SHB-4 at TA-18) appear to have encountered groundwater. The holes were all continuously cored with conventional wireline diamond coring techniques. Maintaining high percentage core recovery in nonwelded tuff and loose formations with air as the circulating fluid proved impossible. Light muds, however, improved recovery in these zones considerably. A variety of bits were tested, but none yielded consistent results in the alternating hard and soft rock conditions found beneath the Laboratory.},
doi = {},
url = {https://www.osti.gov/biblio/7368503}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1993},
month = {1}
}

Technical Report:
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