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Fachausschuss Geophysik

In situ estimation of formation stress for Frac-strategy using sonic logging methods

There is a new interpretation method that has been developed for quantitative formation stress anisotropy borehole-logging using commercial cross dipole shear-wave sonic logs. Based on “In-Borehole-Tomographic Reconstruction” (IBTR) of the shear waves travelling through the immediate surrounding area of the borehole formation with the penetration depth as a function of the source receiver offset, a 3D-shear-wave velocity vs-distribution around the borehole was reconstruced. The formation stress anisotropy reflecting vs-distribution around a borehole is decomposed repeatedly in a quantitative minimal/maximal formation stress ratio for each depth. The method operates in both vertically and horizontally inclined boreholes.
As examples logs of ratios of the local minimal/maximal formation-stress amplitudes DrotSh/SH were generated for two gas production boreholes in the Rotliegend-Formation of northern Germany in a range of 0.86…0.99.

Autoren
H. Lindner, C. Pretzschner
Copyright
2004
Softcover ISBN
3-936418-26-8
Buchreihen ISSN
0937-9762
Seitenzahl
47
Anzahl der Bilder
27
Anzahl der Tabellen
6
Direkt bestellen
50,00 €