- Home
- Conferences
- Conference Proceedings
- Conferences
EAGE/SEG Research Workshop on Fractured Reservoirs-Integrating Geosciences for Fractured Reservoirs Description 2007
- Conference date: 03 Sep 2007 - 06 Sep 2007
- Location: Perugia, Italy
- ISBN: 978-90-73781-74-0
- Published: 03 September 2007
41 - 42 of 42 results
-
-
Time-lapse Shear-wave Splitting: Monitoring Hydraulic Fracturing of a Tight Gas Reservoir
By M.S. CaseyThe Reservoir Characterization Project at the Colorado School of Mines has collected time-lapse multi-component seismic data over a tight gas reservoir in Rulison field, Piceance basin, CO. These data are processed using a new method to localize changes of shear wave splitting in the reservoir interval. The process of shear-wave splitting is posed as an inverse problem involving instantaneous time shift calculation between shear wave modes. The time-lapse time shifts of the fast and slow shear wave modes are calculated first and then differenced. Finally, the derivative of the relative time shifts is taken to localize changes within the reservoir. The results clearly show increased shear wave splitting attributed to the presence of a massive hydraulic fracture, which was stimulated in the time-lapse interval. The azimuth of this fracture anomaly agrees with the maximum horizontal stress direction obtained through 1D well bore geomechanics.
-
-
-
The Meaning of Fractures
Authors G.D. Couples and G. MinelliFractures can affect many characteristics of rocks, including their flow properties, acoustic responses, and strengths. Several different disciplines have a keen interest in fracture issues, but there are difficulties in achieving effective communications between the different areas of expertise. The primary reason for this situation is that each group has developed a different model for what they mean by “fracture”. We illustrate the various versions of what is meant by the term “fracture”. The message of this presentation is that no single model is correct, but all models may be useful within their own context. The path leading to better communication is for each discipline to understand what the other groups mean. It would be useful to move towards a conceptual representation of fractures that draws on object-oriented methods: the underlying reality is represented by particular instances that may be appropriate within a specific context, but other instances may be needed when the context changes. For too long we have been like the blind men touching an elephant. Now we need to remove our blindfolds and ask what others have experienced.
-