Full-waveform processing and interpretation of kilohertz cross-well seismic data

Journal Article · Wed Sep 01 00:00:00 EDT 1993 · Geophysics; (United States)

DOI:https://doi.org/10.1190/1.1443508· OSTI ID:5910023

Khalil, A A ^[1]; Stewart, R R ^[2]; Henley, D C ^[3]

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1. Shell Egypt, Heliopolis, Cairo (Egypt)
2. The Univ. of Calgary, Alberta (Canada). Dept. of Geology and Geophysics
3. Shell Canada Ltd., Calgary, Alberta (Canada). Research Centre

High-frequency, cross-well seismic data, from the Midale oil field of southeastern Saskatchewan, are analyzed for direct and reflected energy. The goal of the analysis is to produce interpretable sections to assist in enhanced oil recovery activities (CO[sub 2] injection) in this field. Direct arrivals are used for velocity information while reflected arrivals are used for velocity information while reflected arrivals are processed into a reflection image. Raw field data show a complex assortment of wave types that includes direct compressional and shear waves and reflected shear waves. A traveltime inversion technique (layer stripping via ray tracing) is used to obtain P- and S-wave interval velocities from the respective direct arrivals. The velocities from the cross-well inversion and the sonic log are in reasonable agreement. The subsurface coverage of the cross-well geometry is investigated; it covers zones extending from the source well to the receiver well and includes regions above and below the source/receiver depths. Upgoing and downgoing primary reflections are processed, in a manner similar to the vertical seismic profiling/common-depth-point (VSP/CDP) map, to construct the cross-well images. A final section is produced by summing the individual reflection images from each receiver-gather map. This section provides an image with evidence of strata thicknesses down to about 1 m. Synthetic seismograms are used to interpret the final sections. Correlations can be drawn between some of the events on the synthetic seismograms and the cross-well image.

• OSTI ID: 5910023
• Journal Information: Geophysics; (United States), Vol. 58:9; ISSN 0016-8033
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
58 GEOSCIENCES
PETROLEUM DEPOSITS
SEISMIC SURVEYS
SASKATCHEWAN
DATA ANALYSIS
IMAGE PROCESSING
CARBON DIOXIDE INJECTION
ENHANCED RECOVERY
OIL WELLS
REFLECTION
RESERVOIR ENGINEERING
SEISMIC WAVES
SONIC LOGGING
VELOCITY
WELL STIMULATION
CANADA
DEVELOPED COUNTRIES
ENGINEERING
FLUID INJECTION
GEOLOGIC DEPOSITS
GEOPHYSICAL SURVEYS
MINERAL RESOURCES
MISCIBLE-PHASE DISPLACEMENT
NORTH AMERICA
PROCESSING
RESOURCES
STIMULATION
SURVEYS
WELL LOGGING
WELLS
020200* - Petroleum- Reserves
Geology
& Exploration
020300 - Petroleum- Drilling & Production
580000 - Geosciences