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Table T3. Measurement acronyms, units, vertical resolutions, and depths of investigation (where available) of LWD tools deployed during Expedition 311.

Tool Output Tool name/Explanation of output Unit Vertical resolution (cm) Depth of investigation (cm)
ADNVISION








 		   Azimuthal Density Neutron tool      
DCAV Density caliper inches    
TNPH Thermal neutron porosity % 31  
PEF Photoelectric factor b/e–    
RHOB Density g/cm3 15  
IDRO
 		 Image-derived density g/cm3    
Oriented density images of borehole wall      
EcoScope

















 		   Multifunction tool      
AXXH, AXXL, AXXB Attenuation resistivity at source-receiver spacing XX, where XX = 16, 22, 28, 34, 40 inches m 55–122 48–102
PXXH, PXXL, PXXB Phase-shift resistivity at source-receiver spacing XX, where XX = 16, 22, 28, 34, 40 inches m 21–30 33–79
GRMA_FILT Calibrated, filtered gamma ray gAPI 46  
DCAV Density caliper inches    
UAV Ultrasonic caliper inches    
IDPE Image-derived photoelectric factor b/e–    
TNPH Thermal neutron porosity % 31  
BPHI Best thermal neutron porosity %    
RHOB Density g/cm3 15  
IDRO
 		 Image-derived density g/cm3    
Oriented density images of borehole wall      
GeoVISION









 		   Resistivity-at-the-Bit tool      
GR_RAB_FILT Calibrated, filtered gamma ray gAPI 46  
RBIT Bit resistivity m 30–61 81
RING Ring resistivity m 8–10 55–64
BDAV Deep button resistivity average m 5–8 44–61
BMAV Medium button resistivity average m 5–8 38–53
BSRAV
 		 Shallow button resistivity average m 5–8 28–41
Oriented resistivity images of the borehole wall   5–8  
ProVISION






 		   Nuclear Magnetic Resonance tool      
MRP Magnetic resonance porosity % 15–120 7
BFV Bound fluid volume %    
FFV Free fluid volume %    
T2LM Log mean T2 relaxation time ms    
T2 T2 distribution (30 values at each depth) %    
SonicVISION

 		   Sonic tool      
DTCC Compressional wave slowness µs/ft 61 ~10

Note: Output: H = 2 MHz resistivity, L = 400 kHz resistivity, B = blended resistivity. For the complete list of acronyms used in IODP and for additional information about tool physics, consult IODP-USIO Science Services, LDEO, at iodp.ldeo.columbia.edu/TOOLS_LABS/tools.html.

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