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Fracture Characterization Using Previous HitBoreholeNext Hit Acoustic Reflection: Theoretical Modeling and Field Data Applications

Alexei Bolshakov1*, Xiao Ming Tang1**, Gunawan Sucahyo2, and Doug Patterson1
1Baker Hughes, USA
2Baker Hughes, Indonesia
*[email protected]
**[email protected]

Characterization of Previous HitboreholeNext Hit fractures is important because they provide conduits for reservoir fluid flow. Previous HitBoreholeNext Hit Previous HitStoneleyNext Hit Previous HitwavesNext Hit have been used as a means for fracture analyses, which however, are a difficult task to interpret because Previous HitboreholeNext Hit changes (e.g. washout) and bed boundaries also cause reflections. We used theoretical modeling to characterize fracture-induced reflections. Fractures were modeled as localized, highly permeable structures embedded in a varying Previous HitboreholeNext Hit environment (e.g. washout). The modeling led to an important result; namely that permeable fractures/structures generally cause Previous HitStoneleyNext Hit wave reflectivity to increase towards low frequencies. This result was used to provide a dual-frequency Previous HitStoneleyNext Hit reflection method for fracture characterization. The reflection data were processed in two different frequency ranges (e.g., 0–1,000 Hertz and 1,000–2,000 Hertz). Fracture-induced reflections were characterized by low-frequency reflectivity, which is significantly higher than high-frequency reflectively. This method has been applied to fractured reservoirs with promising results. The fractures measured by the acoustic method agreed well with those from Previous HitboreholeTop image data. The presentation proposes a refined acoustic reflection method for fracture characterization. It demonstrates the practicality and robustness of the proposed technique in field data applications.

 

AAPG Search and Discovery Article #90077©2008 GEO 2008 Middle East Conference and Exhibition, Manama, Bahrain