Wireline logging tools principle and properties :

  • Mechanical logs (e.g., calipers).
  • Electrical logs (e.g., later logs, induction logs, SP logs).
  • Natural radiation logs (e.g., simple and spectral gamma ray logs) Acoustic logs (e.g., sonic logs).
  • Pressure and temperature MDT logs Artificial radiation logs (e.g., density and neutron logs).
  • Imaging logs (e.g., FMI, USIT, dipmeter and various other types).
  • Special logs (e.g., NMR logs).

Cased hole logging tools :

  • Casing collar logs.
  • Contact looging tools.
  • Production logging tools.
  • Temperature logging tools.

Formation Evaluation :

  • Petrophysical rock properties rock fluid interaction capillary pressure, wettability fluid displacement in porous medium.
  • Distinguish between reservoir and non-reservoir rock.
  • For the reservoir intervals only, distinguish between hydrocarbons and water filling the pores, hence calculate water saturation in reservoir rocks.
  • For the hydrocarbon fraction, distinguish between oil and gas, hence calculate gas and oil saturations in reservoir rocks.
  • Integration of log derived properties and core derived properties,capillary pressure, saturation.
  • Fluid contacts from logs pressure data and special core analysis (SCAL).
  • Petrophysical workflow for integrated geological modelling.

Geological Application of wireline logs :

  • Environment of deposition sequence analysis and sequence boundaries.
  • Overpressure, zone identification.
  • Geomechical application of petrophysical data.
  • Fractures/faults and unconformity identification.