THEORY
AND APPLICATIONS OF
WELL LOGS
|
Measurement Type |
Measuring Device |
Measured Parameters |
| The Formation Resistivity | Laterolog type | |
| The Formation Resistivity | Induction type | Formation Resistivity in invaded and uninvaded zones |
| Flushed Zone Resistivity | MSFL type | Formation Resistivity in flushed zone |
| Lithology and Porosity | Neutron Log | Neutron formation porosity, Cased Hole Neutron Porosity |
| Density Log | Density formation porosity | |
| Litho-Density | Formation density , porosity and PE (Photoelectric) | |
| Acoustic Logging | Standard Sonic | 
and Sonic Porosity |
, 
and Sonic Porosity |
||
| Dipole Sonic | ,
Sonic Porosity and
rock
mechanics |
|
| Borehole Acoustic Imaging | 360 degree borehole image, fractures | |
| Water Saturation |
There is no logging tool for measuring water saturation. After running porosity and resistivity logs Water Saturation may be computed by Archie's Equation |
|
| Formation Dip | Dipmeter | Dip of formation, sedimentary features, fractures, depositional enviroments. |
| Formation Scanner | Borehole Image, | |
| Permeability | Magnetic Resonance | Magnetic Resonance Imaging, permeability, free water & irreducible water |
| Mesurement of Natural Events | Spontaneous Potential (SP) | Sand-Shale differentiation and estimation of shaliness |
| Gamma Ray (GR) | Clean zone –Shaly zone differentiation, Shale Volume from Gamma Ray (GR) | |
| Spectral Gamma-Ray | Clay Analysis (K,U Th concentrations) | |
| Temperature | Fractured zones, thief zones or water enterance | |
| Borehole geometry | Caliper | Borehole diameter and geometry |
| Formation pressure, fluid | Formation Tester | Formation fluid sample, permeability and formation pressure |
| Geology | Logging
tools may reveal geological facts.. |
Fault, Breakouts, Compaction, |
| Mineral And Rocks | Logging Parameters for Elements, Mineral And Rocks | |
| Borehole Seismic | VSP Check-Shot for seismic data control |