Changes

No core-based orientation technique can be considered to give real-time results. In each case, recovered core must be analyzed or sampled. That data, combined with laboratory or borehole information (wireline or televiewer runs) may not be available for days or months.

No core-based orientation technique can be considered to give real-time results. In each case, recovered core must be analyzed or sampled. That data, combined with laboratory or borehole information (wireline or televiewer runs) may not be available for days or months.

==Advantages and disadvantages of core orientation TechniqueS==

==Advantages and disadvantages of core orientation techniques==

Numerous studies have been done to determine the accuracy of different orientation techniques. Nelson et al.<ref name=pt03r37>Nelson, R. A., Lenox, L. C., Ward, B. J., 1987, Oriented core—its use, error, and uncertainty: AAPG Bulletin, v. 71, n. 4, p. 357–367.</ref> provides a particularly comprehensive review of error sources for mechanical orientation and comparisons of accuracy with other techniques. Core orientation techniques are capable of achieving, under optimum conditions, accuracies of ≤5°. Sources and severity of errors depend on many factors, some of which are listed here:

Numerous studies have been done to determine the accuracy of different orientation techniques. Nelson et al.<ref name=pt03r37>Nelson, R. A., Lenox, L. C., Ward, B. J., 1987, Oriented core—its use, error, and uncertainty: AAPG Bulletin, v. 71, n. 4, p. 357–367.</ref> provides a particularly comprehensive review of error sources for mechanical orientation and comparisons of accuracy with other techniques. Core orientation techniques are capable of achieving, under optimum conditions, accuracies of ≤5°. Sources and severity of errors depend on many factors, some of which are listed here: