GeoView, Inc.

Borehole logging case study


Courtesy of Courtesy of GeoView, Inc.

Corozal, Puerto Rico

GeoView was tasked to conduct borehole geophysical logging of at a groundwater extraction well in the rural area of the Municipality of Corozal, Puerto Rico. Prior groundwater tests indicated possible contamination of the groundwater. The study area was primarily underlain by stratified, mostly dark gray basaltic tuff, andesite and basalt porphyry rocks assigned to the Los Negros Formation of Lower and Upper Cretaceous with local intrusions of quartz diorite of Tertiary Age.  The mapped rocks appear highly faulted and folded and show a general NW-SE strike and moderate (45°-60°) dips to the southwest. Shear zones, intense folding and flexural-slip faulting are typical in the deformational history of the area.  The objective of the survey was to determine the physical properties of the borehole walls, fracture occurrence and vertical flow within the wells.  All the down-hole equipment was properly calibrated and decontaminated with Alconox and laboratory grade de-ionized water prior to logging at each borehole. The suite of logging at each well was conducted in the order presented below and included the following:

  • Temperature and Fluid Resistivity (Mount Sopris)
  • Mechanical 3-arm Caliper (Mount Sopris)
  • Optical tele-viewer (Mount Sopris, OBI Optical Televiewer)
  • Acoustic tele-viewer (Mount Sopris, ABI Acoustic Televiewer)
  • Gamma-SP Resistance, Normal Resistivity (Mount Sopris, 8/16/32/64 normal resistivity, Gamma, SP, SPR 41mm, 1.61” O.D.) *
  • Heat Pulse Flow-meter

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