Identification and Characterization of Hydrogeologic Units at the Nevada Test Site Using Geophysical Logs: Examples from the Underground Test Area Project

Lance Prothro  Drellack, Sigmund¹  Townsend, Margaret¹ 

[1] National Security Technologies, LLC, Las Vegas, NV (United States)

关键词: BOREHOLES;    DRILL CORES;    GEOLOGY;    KNOWLEDGE BASE;    NEVADA TEST SITE;    NUCLEAR WEAPONS;    SECURITY;    TESTING geophysical logs;    groundwater;    Nevada Test Site;    hydrogeology;   

DOI  :  10.2172/950488
RP-ID  :  DOE/NV/25946--679
PID  :  OSTI ID: 950488

学科分类：地球科学(综合)

美国|英语

来源: SciTech Connect

【 摘 要 】

The diverse and complex geology of the Nevada Test Site region makes for a challenging environment for identifying and characterizing hydrogeologic units penetrated by wells drilled for the U.S. Department of Energy, National Nuclear Security Administration, Underground Test Area (UGTA) Environmental Restoration Sub-Project. Fortunately, UGTA geoscientists have access to large and robust sets of subsurface geologic data, as well as a large historical knowledge base of subsurface geological analyses acquired mainly during the underground nuclear weapons testing program. Of particular importance to the accurate identification and characterization of hydrogeologic units in UGTA boreholes are the data and interpretation principles associated with geophysical well logs. Although most UGTA participants and stakeholders are probably familiar with drill hole data such as drill core and cuttings, they may be less familiar with the use of geophysical logs; this document is meant to serve as a primer on the use of geophysical logs in the UGTA project. Standard geophysical logging tools used in the UGTA project to identify and characterize hydrogeologic units are described, and basic interpretation principles and techniques are explained. Numerous examples of geophysical log data from a variety of hydrogeologic units encountered in UGTA wells are presented to highlight the use and value of geophysical logs in the accurate hydrogeologic characterization of UGTA wells.