Static delays in acoustic logging

Journal Article · Tue Mar 01 04:00:00 EST 1994 · Geophysics; (United States)

DOI:https://doi.org/10.1190/1.1443598· OSTI ID:7233606

Leveille, J P; Nerf, Jr, R B ^[1]

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1. Shell Development Co., Houston, TX (United States). Bellaire Research Center

Borehole-consistent analysis (analogous to surface-consistent seismic refraction statics analysis) of compressional wave arrivals in full-waveform acoustic logs reveal arrival-time anomalies of tens of microseconds. These anomalies are correlated with lithology and are similar for logging sondes of different geometries. The magnitude of the anomalies makes it unlikely that they are caused by caliper errors or the presence of an altered annulus around the borehole. A possible explanation is given in terms of the Fourier phase spectrum of the first compressional arrivals. The theoretical delays depend on the formation elastic parameters, the borehole geometry and the properties of the borehole fluid; a sensitivity analysis of the relevant parameters is presented.

• OSTI ID: 7233606
• Journal Information: Geophysics; (United States), Journal Name: Geophysics; (United States) Vol. 59:3; ISSN GPYSA7; ISSN 0016-8033
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200 -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
58 GEOSCIENCES
580000* -- Geosciences
ACOUSTIC MEASUREMENTS
BOREHOLES
CAVITIES
DATA ANALYSIS
ERRORS
SEISMIC WAVES
SONIC LOGGING
WAVE PROPAGATION
WELL LOGGING