− | Cores are oriented to facilitate measurement of directional properties in the rock. Most routinely, orientation is used to measure large scale features such as bedding, cross-bedding, fractures, flow textures, and stylolites<ref name=pt03r40>Pettijohn, F. J., Potter, P. E., Siever, R., 1973, Sand and sandstone: New York, Springer-Verlag, 618 p.</ref>. In recent years, oriented core has been used to establish the directions of downhole stress and strain fields<ref name=pt03r46>Teufel, L. W., Hart, C. M., Sattler, A. R., Clark, J. A., 1984, Determination of hydraulic fracture azimuth by geophysical, geological, and oriented core methods at the multi-well experiment site, Rifle, Colorado: Sandia National Laboratories Paper SAND 84-0380, Society of Petroleum Engineers Paper No. 13226, 15 p.</ref>; Smith et al., 1984; <ref name=pt03r31>Lacy, L. L., 1984, Comparison of hydraulic fracture orientation techniques: Society of Petroleum Engineers Paper No. 13225, 12 p.</ref>. | + | Cores are oriented to facilitate measurement of directional properties in the rock. Most routinely, orientation is used to measure large scale features such as bedding, cross-bedding, fractures, flow textures, and stylolites<ref name=pt03r40>Pettijohn, F. J., Potter, P. E., Siever, R., 1973, Sand and sandstone: New York, Springer-Verlag, 618 p.</ref>. In recent years, oriented core has been used to establish the directions of downhole stress and strain fields<ref name=pt03r46>Teufel, L. W., Hart, C. M., Sattler, A. R., Clark, J. A., 1984, Determination of hydraulic fracture azimuth by geophysical, geological, and oriented core methods at the multi-well experiment site, Rifle, Colorado: Sandia National Laboratories Paper SAND 84-0380, Society of Petroleum Engineers Paper No. 13226, 15 p.</ref>; Smith et al., 1984{{missing ref}}; <ref name=pt03r31>Lacy, L. L., 1984, Comparison of hydraulic fracture orientation techniques: Society of Petroleum Engineers Paper No. 13225, 12 p.</ref>. |