Evaluation of Permeable Fractures by Multi-Offset Hydrophone VSP
- Key words
- Exploration; Reservoir Engineering; S Wave; P Wave; Seismic Survey; Tube Wave; Models
- Location
- Iidate, Japan
- Conference
- Geothermal Resources Council Transactions
- Year
- 1992
- Session
- Exploration; Geophysical surveys; Vertical seismic profiles;
- Language
- English
Abstract
We carried out an multi offset hydrophone VSP experiment in order to detect permeable fractures intersecting borehole and to characterize them. We calculated fracture dip, strike and permeability from the amplitude ratio of tube wave and P wave from the three shots. Calculated permeability is of the order of 100md. With tub wave analysis, we are able to distinguish permeable fractures from impermeable fractures observed at the wellbore. Frequency dependence of the tube wave and P wave amplitude ratio implies that more accurate measurements and more realistic tube wave generation model is necessary for improving the fracture parameter analysis.
Copyright 1992, Geothermal Resources Council. Readers who download papers from this site should honour the copyright of the original authors, and may not copy or distribute the work further without the permission of the original publisher.