CoreandServices.book - Ocean - Schlumberger

Units
Measurements are organized into a hierarchy with base measurements at the top. With
each level in the hierarchy some convention is imposed restricting the data represented by
the measurement (Fig. 4-7 on page 4-198). The depth of the hierarchy depends on the
organization of the measurements contained in the hierarchy.
Length
length through
rock layer
Diameter
Thickness
Core Diameter
Inside Diameter
diameter of core
sample from borehole
diameter of pipe interior
Unit
Fig. 4-7 Measurement Hierarchy
A unit defines the standard quantity for a measurement. Units provide meaning to the
measurements represented by the data. Units are associated with base measurements
(Fig. 4-8 on page 4-198). This means that all measurements that are derived from a base
measurement will use the same set of units.
base measurements
units
Length
Temperature
Volume
Flowrate
Pressure
ft, m, in, cm, mi, km
o C, o F, o K
ft 3 , m 3 , gal, L, bbl, acre.ft
ft 3 /d, m 3 /d, bbl/d
psi, bar, atm, pa
Fig. 4-8 Unit to Base Measurement Association
4-198 Ocean Application Development Framework 2008.1
Schlumberger Private