Schlumberger

Mnemonics, Software product, STFRAC


CodeSTFRAC
NameStoneley Fracture
DisciplineGeology
TypeAPPLICATION
DescriptionFracture Evaluation from borehole Stoneley wave

Related channels
ChannelDescription
ADST Averaged Stoneley Slowness
EVENTD Event Flag for Downgoing Reflector
EVENTU Event Flag for Upgoing Reflector
LNERRD Linear Least Square Fit Error - Downgoing Reflection
LNERRU Linear Least Square Fit Error - Upgoing Reflection
RCDT Downgoing Reflection Coefficient (Time Domain)
RCUT Upgoing Reflection Coefficient (Time Domain)
REFCD Down-going reflection coefficient channel
REFCU Up-going reflection coefficient channel
ST_ENVD Envelope of time domain down-going reflection coefficient
ST_ENVU Envelope of time domain up-going reflection coefficient
ST_RWD Frequency domain down-going reflection coefficient
ST_RWU Frequency domain up-going reflection coefficient
ST_SDD Down-going Direct wave
ST_SDU Up-going Direct wave
ST_SRD Down-going Reflected wave
ST_SRU Up-going Reflected wave
ST_SRWD Frequency domain down-going reflection coefficient at only events
ST_SRWU Frequency domain up-going reflection coefficient at only events

Related parameters
ParameterDescription
DSTL Direct arrival Stoneley wave packet length
HHTAP Length of the half hanning taper window in zero-fill
NLAVE Number of frames for averaging
REFC Minimum amplitude of time domain reflection coefficient
REFH Frequency band high for ref coef channels
REFL Frequency band low for ref coef channels
S2N Peak-to-noise-floor amplitude ratio for Stoneley spectrum estimates
STQ Length of the baseline quiet zone used in zero-mean step
THDD Acceptable deviation of intercept point for reflector locating
THDS Acceptable deviation of the reflection ray move-out slowness for reflector locating
THLC Acceptable linear least square error for reflector locating
ZMASK Minimum separation of two resolvable fractures


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