Crosswell seismic measurement of transverse isotropy in V/sub p/ and Q/sup p/
Crosswell seismic measurements of apparent seismic Q/sub p/, V/sub p/, and V/sub s/ were made at the DOE Multi-Well Experiment (MWX) site near Rifle, Colorado. The MWX wells penetrate gas-bearing low permeability sandstones in the Mesa Verde formation at depths between 1950-2010 meters. Numerous measurements of Q/sub p/ were made between angles of 45 and 135 degrees measured from vertical using a modification of the technique of Fehler and Pearson (1984) in which measurement of P-wave amplitude permits the calculation of Q/sub p/, once compensation has been made for the radiation pattern of the source and geometric spreading. The magnitude of Q/sub p/ and V/sub p/ are found to change with propagation angle. Minimum values of Q/sub p/ and maximum values of V/sub p/ were measured parallel to sedimentary layering (15 and 4.75 km/s, respectively). A roughly linear increase in Q/sub p/ and a decrease in V/sub p/ occurs with increasing inclination of propagation paths to horizontal bedding planes. At 50 degrees from vertical a 90 percent increase in Q/sub p/ and a 7 percent decrease in V/sub p/ relative to values in the horizontal direction were measured. No change in V/sub s/ was observed. 12 refs., 3 figs., 1 tab.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 5211856
- Report Number(s):
- LA-UR-86-1160; CONF-861108-3; ON: DE86010166
- Resource Relation:
- Conference: 56. annual international meeting and expo of the Society of Exploration Geophysicists, Houston, TX, USA, 2 Nov 1986; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
Similar Records
In-situ physical properties measurements using crosswell acoustic data
Crosswell logging for acoustic impedance
Related Subjects
58 GEOSCIENCES
COLORADO
NATURAL GAS DEPOSITS
SEISMIC SURVEYS
SANDSTONES
EXPERIMENTAL DATA
INCLINATION
NATURAL GAS WELLS
SEISMIC P WAVES
SEISMIC S WAVES
VELOCITY
DATA
FEDERAL REGION VIII
GEOLOGIC DEPOSITS
GEOPHYSICAL SURVEYS
INFORMATION
MINERAL RESOURCES
NORTH AMERICA
NUMERICAL DATA
RESOURCES
ROCKS
SEDIMENTARY ROCKS
SEISMIC WAVES
SURVEYS
USA
WELLS
030200* - Natural Gas- Reserves
Geology
& Exploration
580203 - Geophysics- Geophysical Survey Methods- (1980-1989)