Page 111 - Open-Hole Log Analysis and Formation Evaluation

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NI \ APPENDIX 5A: Recommended General Logging Programs
Condition - Data Desired Recommended Services Remarks
Fresh mud Correlation and lithology in Dual Induction—SFL—GR/SP; Induction The dual induction and dual laterolog
sand/shale Electrical; Dual Laterolog—GR/SP devices are superior to single induction
Bmp. 5 (low porosity and/or high and single laterolog in all cases
Ww Sidewall cores give lithology in sand/shale
resistivities); Sidewall Cores
Porosity; water saturation; lithology Density and/or Neutron and/or Sonic For shaly sands or simple mixed lithologies,
in carbonates and evaporites; and GR; Formation Tester density—neutron or neutron—sonic. For
complex mixed lithologies use all three.
hydrocarbon type
For hydrocarbon type as above and/or
Formation Tester
Producible hydrocarbons and Proximity-Microlog; Microlaterolog or Proximity log used for thick mudcake,
permeability indicators - Micro-SFL; Dual Resistivity device; Microlaterlog for thin mudcake; Micro-SFL
Sidewall Cores; Formation Tester available with Dual Laterolog. Sidewall
cores give permeability estimate in shaly
sands
Hydrocarbon indication at the Wellsite Computer Products, includ- ’ Available with computer units only.
wellsite ing: apparent formation water resis Others available with both units
tivity, Rua; formation factor/resistiv-
ity overlay; and R,o/R, vs. SP overlay
Formation dip magnitude and ‘ Dipmeter Wellbore directional information is also
directional available
Salt mud Correlation and lithology. in Dual Laterolog—Micro-SFL-GR In some areas of low porosity and/or mixed
lithology the neutron or density—neutron
sand/shale
Rot <5 is usable as a correlation log
Ww
Porosity, water saturation, and Density and/or Neutron and/or Sonic See remarks under fresh mud
lithology in carbonates and and GR; Formation Tester
evaporites; hydrocarbon type
Producible hydrocarbons and Proximity—Microlog; In very salty. muds or when Ry, is less than
permeability indicators Microlaterolog-Microlog; Dual Rme the microlog results may be
Laterolog—Micro-SFL; Sidewall Core; unsatisfactory. See remarks under fresh
Formation Tester mud