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.
- CBL/VDL, USIT.
- 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.
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