| Title | Evaluation of Permeable Fractures by Multi-Offset Hydrophone VSP |
|---|---|
| Authors | Kiguchi, Tsutomu; Ito, Hisao; Kuwahara, Yasuto; Nakao, Shinsuke; Ohminato, Takao |
| Year | 1992 |
| Conference | Geothermal Resources Council Transactions |
| Keywords | Exploration; Reservoir Engineering; S Wave; P Wave; Seismic Survey; Tube Wave; Models |
| 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. |