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Table T15. Measurements and specifications for wireline logging tools. (See table notes.)

Tool string Tool* Measurement Sampling
interval (cm)		 Approximate vertical
resolution (cm)		 Depth of investigation
(cm)
Laterolog HRLA Laterolog resistivity 5.1 31 127
EDTC Gamma ray   31 61
Radioactive combination HLDS Bulk density, PEF, caliper   38 15
HGNS Porosity, natural gamma ray ~23 31 61
HNGS Spectral gamma ray 15 20–30 24
FMS-sonic combination EDTC Gamma ray   31 61
Sonic Scanner Sonic 15.24 <182  
FMS Microresistivity 0.25 0.5 2.5
VSI EDTC Gamma ray   31 61
VSI Seismic velocity Variable NA  

Notes: * = all tool names are trademarks of Schlumberger. For additional information about tool physics and use, see Chikyu Logging Service Information, at www.jamstec.go.jp/chikyu/eng/Expedition/logging.html. HRLA = High-Resolution Laterolog Array, EDTC = Enhanced Digital Telemetry Cartridge, HLDS = Hostile Environment Litho-Density Sonde, HGNS = Highly Integrated Gamma Ray Neutron Sonde, HNGS = Hostile Environment Natural Gamma Ray Sonde, FMS = Formation MicroScanner, VSI = Versatile Seismic Imager. PEF = photoelectric effect. NA = not applicable.

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