D/V Chikyu
Standard Measurements Policy(Ver. 6; July 2015)

A. Standard Measurements
Chikyu standard measurements are those that are collected on all Chikyu IODP
riser and riserless expeditions if practical for the material being drilled orrecovered. Data from standard measurements are critical to long-term IODPand Chikyu science, regardless of scientific or operational purposes of anexpedition. Deviations from standard measurements should be identified in the
Scientific Prospectus. In addition, the Center for Deep Earth Exploration(CDEX), as operator of Chikyu may require additional measurements to meet
safety requirements and protocols. In the case of riserless drilling, Chikyu will
follow the standard measurements of the JOIDES Resolution.
1. Core Characterization Measurements
These measurements are made on cores or subsamples from cores. They aregrouped in whole round and split round measurements. Split rounds are
separated into working halves (WH) and archive halves (AH). AHs are for nondestructive observation and measurements, while WHs are open for all
sampling and analysis.
Whole round core measurements
Non-destructive• Natural Gamma Ray (NGR)• Gamma Ray Attenuation (GRA)• Magnetic susceptibility (MS)• Non-contact Resistivity (NCR) (sediments)• P-wave Velocity (PWV) (sediments)• X-ray Computed Tomography (CT)• Borehole depth scale
Destructive• Pore water chemistry (or GRIND)• Thermal conductivity (TC)• WR Deep biosphere samples (DeepBIOS)

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Split core measurements
Non-destructive• Digital imaging (AH)
• Reflectance spectroscopy and colorimetry (AH)
• Thermal conductivity (hard rock; WH)• Visual core description (AH)
Destructive• Moisture and density/porosity (MAD; WH)• P-wave velocity (hard rock; WH)• Smear slides and/or thin sections (AH/WH)• Carbonate analyses (WH)
• Bulk carbon-nitrogen-sulfur (CNS) analyses (WH)
• X-ray fluorescence (XRF: major elements in hard rock; WH)
2. Downhole Logging and Measurements
Performed either by logging while drilling or by wireline (availability of logging
services subject to budgetary constraints).
• Natural gamma ray• Resistivity• Leak-off test (LOT; riser drilling only)
3. Cuttings measurements• Visual cuttings description• Cuttings smear slide and/or thin sections• Mud gas monitoring – hydrocarbon
4. Drilling mud measurements
These data are mainly collected by the mud engineer (service company), andare available upon request,•••

Mud component
Specific gravity (s.g.)
Acidity or alkalinity (pH)

5. Rig Floor Measurements
These data are collected in real-time by the drillers. Data are available uponrequest.
• Driller’s depth• Heave compensation• Weight on bit• Penetration rate
• Torque2••

Mud pressure
Pump rate3

B. Optional/Supplemental Measurements
These measurements are defined as additional measurements that may beneeded for expedition objectives, and are conducted where possible andscientifically justified. These will be outlined in the Scientific Prospectus for each
expedition, available online 6-9 months pre-expedition. Be aware that these
may require 3rd-party tools or specialists within the science party.
1. Core measurements• Core logging
o Naturalremnant
magnetism(NRM)
demagnetization (AH)o Whole rock elements and mapping by XRF-CL

with

step-wise•

Cluster analysis
A set of destructive measurements performed on samples from theinterval next to all WR pore water samples or residue of squeezed
WR pore water samples as cluster analysis.
• MAD• XRD• XRF• Carbonate analysis• CNS analysis••Biostratigraphy
Anhysteretic Remanent Magnetization (ARM) and Isothermal Remanent
Magnetization (IRM) with step-wise acquisition and demagnetization
Shear strength
Cell counts
Contamination testing
Microbial activity measurements using radiotracers
Whole rock major (sediments) and trace elements (sediments and hardrock)*
Rock maturity analysis*
X-ray diffraction (XRD) bulk mineralogy *Micro-imaging (Scanning Electron Microscope) *Headspace gas and void gas analysis*
Particle size analysis*
Close-up photography*
Infrared observation
Resistivity
P-wave velocity (sediments)

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*Also applied to cuttings42. Downhole measurements• Nuclear magnetic resonance• Sidewall coring• Pressurized fluid/gas sampling• Borehole temperature• Formation pressure• Packer tests• Spectral gamma• Density• Porosity• Sonic velocity• Borehole imaging• Borehole caliper measurements• Formation temperature (e.g. APCT-3)• Annular pressure (LWD only)
3. Cuttings measurements• Moisture and density• Carbonate analyses• Bulk carbon- nitrogen-sulfur (CNS) analyses• Whole rock major elements• Biostratigraphy
4. Drilling mud gas measurements• Methane carbon isotope• Whole gas mass spectrometry

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