Petrophysical Services

OGEC associates can provide petrophysical services from organizing and pre-processing to advanced processes. Our expertise spans from standard triple combo open-hole or LWD to advanced systems such as nuclear magnetic resonance, dipole sonic and elemental spectroscopy.

Pre-Processing: Data Edit And Depth Matching
  • Depth matching of curves to primary log
  • SP baseline correction
  • Merging/Splicing
  • Filter or smooth log curves,
Pre-Processing: Environmental Corrections For Standard Log Curves
  • GR, NPHI, RHOB environmental correction
  • “Tornado chart” resistivity correction
  • Develop QC curves (e.g differntial caliper) and mark bad hole conditions.
Pre-Processing: Log Normalization
  • Well/Field histograms for GR, RHOB, NPHI, DT, and Resistivity
  • Well/Field cross-plots for available porosity and resistivity dataCross-plot and curve fit for core “P&P” and core/log Phi data
Analysis: Derivation Of Petrophysical Parameters, Litho-porosity model
  • Calculate clay volume using appropriate model for each zone
  • Calculate lithology corrected porosity curves
  • Calculate cross-plot porosity and “PHIE”
  • If available compare to core analysis
  • Build a multi mineral lithology model
Analysis: Water Saturation (Sw) And Other Volumetric Calculations
  • Pickett plots for each zone to determine a, m, n, and Rw
  • Compute “Rwa” and Rw from the SP to verify Pickett plots​
  • If available compare to core analysis
  • Select appropriate Sw model
  • Calculate gross, net, pay, N/G ratio, PHIE, average   PHIE, Sw, average
  • Sw, Phi-h, BVW, and HPV
Summation Reports
  • Input client defined formation tops and bottoms
  • Based on pay criteria, select “cutoffs” for Vshale, PHIE, and Sw
  • Spreadsheet summarize results by well and formation
Deliverables
  • Color hard copy logs/pertinent cross-plots
  • Hard copy and digital summation spreadsheets
  • Original input and computed data on client specified media and format
  • Color hard copy or pertinent cross-plots and graphs
  • A written report summarizing methods, assumptions, parameters, and results
  • Summation spread sheets by well and formation