Multi-function workhorse helps characterize reservoirs 

Compensated Spectral Natural Gamma Ray (CSNG) service helps you thoroughly characterize reservoirs and confidently estimate net pay. The service can detect producible zones by distinguishing clean reservoir rock or radioactive pay zones from shales, revealing fractured or highly permeable reservoirs. 



Operator discovers addtional 400 feet of net pay

When a Gulf of Mexico operator needed to obtain high-quality formation evaluation, rotary cores, pressures, and fluid samples in two large open holes, they turned to Halliburton.



  • Measures and records the energy of individual gamma rays 
  • Forms a spectrum of gamma energies indicating the number of gamma rays recorded at each energy level 
  • Divides overall spectrum into overlapping low and high spectra 
  • Photoelectric ratio produced by low-energy spectrum (0 to 350 keV) can be interpreted to help determine lithology in openhole wells or casing thickness in cased wells 


  • Aids detection of producible zones by more accurately distinguishing reservoir rock from those containing clays. Sandstones generally have low potassium and thorium concentrations compared to shales 
  • Increases reservoir understanding. Fractured or highly permeable reservoirs can be discovered when high uranium concentrations appear with low potassium and thorium concentrations. High uranium and thorium counts with low potassium counts indicate a clean reservoir containing accessory minerals
  • Helps determine clay types, volumes, and cation exchange capacity using elemental concentration data and Clay and Matrix Analysis (CLAMS™) post-processing analysis 
  • Locating improved single-pass performance for radioactive tracers with the CSNG tool in Halliburton’s TracerScan™ service to improve the evaluation of hydraulic fracturing, gravel packing, and frac packing operations

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