Demonstration of high-resolution inverse VSP for reservoir characterization applications
Three-component downhole sensor planting techniques and instrumentation were developed and evaluated under controlled field conditions for high-resolution inverse VSP measurements. A lightweight (50-1b) commercial three-component VSP probe was modified to contain high-sensitivity high-frequency accelerometer sensors and a lightweight (7-1b) pneumatically clamped three-component detector was assembled with high-sensitivity highfrequency accelerometer sensors and a preamplifier unit. To reduce cross feeding between the channels of the data acquisition system, the pneumatically clamped three-component detector was constructed with shielded circuits in the conductor cable and the electronic unit containing the preamplifiers was located near the accelerometers. Three-component seismic data were successfully recorded using an experimental high-frequency inverse VSP system which included a borehole cylindrical bender source, the modified commercial three-component VSP probe, the lightweight pneumatically clamped three-component detector, and a three-channel data-acquisition system developed for the inverse VSP experiments. The three-component VSP probe and the pneumatically coupled probe readily respond to high-frequency seismic-wave propagation through the formations. These measurements demonstrated that seismic waves in the frequency range of about 500 Hz to 2,500 Hz could be transmitted through the earth using a high-frequency piezoelectric cylindrical bender source and three-component detector probes containing high-frequency accelerometers. A comparison of seismic waveforms obtained with the VSP probe and with the pneumatically coupled detector indicated the presence of strong probe body resonances in the traces acquired using the VSP probe. In comparison, the pneumatically clamped probe signals showed much superior time series and spectral responses to the wideband source pulses than those of the VSP probe.
- Research Organization:
- Southwest Research Inst., San Antonio, TX (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC22-89BC14473
- OSTI ID:
- 7007755
- Report Number(s):
- DOE/BC/14473-T3; ON: DE93001294
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
58 GEOSCIENCES
RESERVOIR ROCK
MAPPING
SEISMIC SURVEYS
SEISMIC WAVES
REFLECTION
BOREHOLES
EXPERIMENTAL DATA
FIELD TESTS
PROBES
SEISMIC DETECTORS
SEISMIC SOURCES
WAVE PROPAGATION
CAVITIES
DATA
GEOPHYSICAL SURVEYS
INFORMATION
MEASURING INSTRUMENTS
NUMERICAL DATA
SEISMIC ARRAYS
SURVEYS
TESTING
020200* - Petroleum- Reserves
Geology
& Exploration
580000 - Geosciences