Shear-wave porosity logging in sands

Journal Article · Sun Mar 01 04:00:00 EST 1992 · SPE Formation Evaluation (Society of Petroleum Engineers); (United States)

DOI:https://doi.org/10.2118/20558-PA· OSTI ID:5652659

Medlin, W L; Alhilall, K A ^[1]

---

1. Mobil R and D Corp. (US)

In this paper, the authors investigated the correlation between porosity and shear-wave velocity from acoustic logs in cored sand intervals. Data were collected in 13 wells with {gt}5,000 ft of core representing worldwide locations. Core porosities ranged from 0.02 to 0.38 at depths between 2,400 and 11,600 ft. Shear-wave velocities were obtained with Mobil's dipole logging tool, and porosities were obtained from standard core analysis. Our correlation data were obtained by averaging porosities and shear-wave travel times over intervals {ge}4 ft, the approximate resolution of our shear-wave tool. The authors excluded intervals in which the porosity or shear-wave travel time varied widely. The authors find a linear correlation between porosity and shear-wave travel time, provided we exclude clay-bonded sands such as those found along the U.S. gulf coast. The correlation coefficient is 0.91, about the same as that for compressional-wave data in the same intervals. These results are consistent with shear-wave data reported for ultrasonic laboratory measurements. Further comparison of our data with ultrasonic measurement shows evidence of dispersion effects.

• OSTI ID: 5652659
• Journal Information: SPE Formation Evaluation (Society of Petroleum Engineers); (United States), Journal Name: SPE Formation Evaluation (Society of Petroleum Engineers); (United States) Vol. 7:1; ISSN 0885-923X; ISSN SFEVE
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
ACOUSTIC MONITORING
DEVELOPED COUNTRIES
DRILL CORES
EVALUATION
MONITORING
NORTH AMERICA
OIL WELLS
PERFORMANCE TESTING
POROSITY
SAND
SCALE MODELS
SHEAR
STRUCTURAL MODELS
TESTING
US GULF COAST
USA
VELOCITY
WAVE PROPAGATION
WELL LOGGING
WELLS