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Downhole Services

Geophysical Logging

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Eliminate all uncertainty and guess work from your bedrock investigations using Endeavor’s full suite of downhole geophysical logging tools. We provide a complete set of quantifiable, precise, and repeatable data. The final product is neatly presented as an easy-to-interpret log composite which will leave you fluently understanding the geology of your site. Log composites are accompanied by formal summary reports, professionally composed with scientific descriptions and analysis of all field observations.

Our Instrumentation Suite Includes:

  • Fluid Temperature and Conductivity
  • Optical Televiewer
  • Acoustic Televiewer
  • 3-Arm Caliper
  • Natural Gamma
  • Short Normal Resistivity
  • Long Normal Resistivity
  • Single-Point Resistance
  • Spontaneous Potential
  • Heat Pulse Flowmeter

Applications of borehole geophysical logging include:

  • Identify zones of hydraulic activity from zones of stagnation

  • Pinpoint inflow zones and outflow zones

  • Measure the direction and magnitude of flow within an open borehole

  • Quantify sudden or gradual changes in water chemistry in relation to depth

  • Accurately measure the depth and thickness of stratigraphic units

  • Cross-hole correlate stratigraphic index layers across a site

  • Establish the exact depths of geologic contacts or changes in lithology

  • Visibly observe sudden or gradual changes in formation color

  • Detect subtle changes in density, grain size, and mineral composition

  • Identify impermeable confining layers such clay lenses or igneous sills

  • Determine the strike, dip direction, and dip angle of bedding and fractures

  • Visibly observe all fractures, voids, cavities, breakouts, and washouts with high-resolution acoustic and optical imaging

  • Characterize fracture orientation using feature traces, and dip tadpoles

  • Classify each observed fracture by its aperture, continuity, and degree of mineralization

  • Recognize structural trends in the rock fabric using rose plots and polar plots

  • Evaluate the orientation of principal stresses on the rock

  • Map borehole deviation in 3 dimensions

  • Accurately measure borehole diameter

  • Select discrete zones to be packer tested

  • Identify intervals of borehole wall conducive to creating packer seals

  • Confirm casing depth and well construction

  • Assess casing-bedrock interface