Page 112 - Open-Hole Log Analysis and Formation Evaluation

86 APPENDIX 54: (Continued)

Condition * Data Desired ‘Recommended Services Remarks
Salt mud (continued) Hydrocarbon indication at the Wellsite Computer Products; Riya, Ro See remarks under fresh mud. Apparent
wellsite Overlay formation water resistivity may not be
satisfactory in low and/or mixed
lithologies .°
Formation dip magnitude and Dipmeter Wellbore directional information is also
Oil-base mud Correlation and lithology in Dual Induction—GR; Induction—GR; High temperature (350 to 400°F) will resirict
directional
available
sand/shale
Sidewall Cores
the use of the dual induction and sidewall
cores
Porosity, water saturation, lithology Density and/or Neutron and/or Sonic; See remarks under fresh mud. High
in carbonates and evaporites, Formation Tester . temperature (350°F) and small holes (6
hydrocarbon type in.) restrict the use of the formation tester
Producible hydrocarbons and Dual Induction; Sidewall Cores; Sidewall cores give permeability estimates
permeability indicators Formation Tester in shaly sands
Hydrocarbon indication at the Wellsite Computer Products; Rig, Ro See remarks under fresh mud
wellsite Overlay
Formation dip magnitude and Dipmeter See remarks under fresh mud
directional
Air- or Gas-filled Resistivity, correlation, and Dual Induction—GR; Induction—GR
hole lithology in sand/shale
Porosity, water saturation, gas Density and/or Neutron Dual spacing neutron CNL cannot be used;
saturation, estimated lithology in must usé gamma ray-neutron (GRN) or
carbonates and evaporites preferably sidewall neutron porosity
(SNP)
Permeability indicator Temperature Log; Noise Log Gas entry
Hydrocarbon. indication at the Wellsite Computer Products; Ro See remarks under fresh mud
wellsite Overlay, Ring
Fresh or unknown Resistivity; correlation and See fresh mud and salt mud See fresh mud and sit mud
formation water estimated lithology in sand/shale

66 Porosity water saturation; estimated Density and/or Neutron and/or Sonic Under conditions of no invasion the
lithology in carbonates and and GR; Electromagnetic electromagnetic propagation tool will
evaporites; hydrocarbon type Propagation Tool; Inelastic Neutron yield water saturation directly. See
Scattering and Capture Gamma Ray remarks under fresh mud
Spectroscopy; Formation Tester
Producible hydrocarbons and Sidewall Cores; Formation Tester
permeability indicators
Hydrocarbon indication at the Wellsite Computer Products See remarks under fresh mud. May use
wellsite electromagnetic propagation tool
Cased hole Fluid type and lithology - Pulsed Neutron Log; Inelastic Neutron
Scattering and Capture Gamma Ray
Spectroscopy; GR and Natural
Gamma Ray Spectroscopy
Porosity and hydrocarbon type Pulsed Neutron Log; Gamma Dual spacing neutron (CNL) cannot be used
Ray—Neutron; Density Formation if hole is gas filled. Under favorable
Tester; Inelastic Neutron Scattering conditions the density may be used for
and Capture Gamma Ray porosity
Spectroscopy
Permeability Formation Tester