− | 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><ref name=Smith el al._1985>Smith, M. B., N.-K. en, G. G. Sorrells, and L. W. Teufel, 1985, A comprehensive fracture diagnostics experiment, Part II, Comparison of seven fracture azimuth measurements: Society of Petroleum Engineers Paper No. 13894, 16 p.</ref><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., P. E. Potter, and R. Siever, 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., C. M. Hart, A. R. Sattler, and J. A. Clark, 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><ref name=Smith el al._1985>Smith, M. B., N.-K. Ren, G. G. Sorrells, and L. W. Teufel, 1985, A comprehensive fracture diagnostics experiment, Part II, Comparison of seven fracture azimuth measurements: Society of Petroleum Engineers Paper No. 13894, 16 p.</ref><ref name=pt03r31>Lacy, L. L., 1984, Comparison of hydraulic fracture orientation techniques: Society of Petroleum Engineers Paper No. 13225, 12 p.</ref> |