Page 113 - Open-Hole Log Analysis and Formation Evaluation

APPENDIX 54: (Continued)

Condition
Remarks
‘Recommended Services
Salt mud (continued)
Wellsite Computer Products; Riya, Ro
Hydrocarbon indication at the
See remarks under fresh mud. Apparent
Overlay
wellsite
formation water resistivity may not be
satisfactory in low and/or mixed
lithologies .°
Formation dip magnitude and
Wellbore directional information is also
Dipmeter

directional
available
Oil-base mud
Correlation and lithology in
Dual Induction—GR; Induction—GR;
High temperature (350 to 400°F) will resirict
sand/shale
Sidewall Cores
the use of the dual induction and sidewall
cores
Porosity, water saturation, lithology
See remarks under fresh mud. High
Density and/or Neutron and/or Sonic;
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
Sidewall cores give permeability estimates
Dual Induction; Sidewall Cores;
Formation Tester
permeability indicators
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
Dual Induction—GR; Induction—GR
Resistivity, correlation, and
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)
Temperature Log; Noise Log
Permeability indicator
Gas entry
Wellsite Computer Products; Ro
See remarks under fresh mud
Hydrocarbon. indication at the
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 86 Air- or Gas-filled * Data Desired Density and/or Neutron and/or Sonic Under conditions of no invasion the
Porosity water saturation; estimated
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