Core goniometry can be undertaken on both oriented and unoriented core using one of two methods: the traditional acetate sleeve method and the 360° core photograph method. Both methods permit orientation of core and geological features visible in the core to provide a high resolution manual dip dataset that can be integrated with core logging, borehole image and petrographic interpretations.
Acetate sleeve core goniometry is carried out manually in the core store by wrapping acetate sheets around the core and by tracing geological features. Resulting acetate sheets are scanned, spliced and loaded into TerraStation software where they are referenced to the borehole deviation and azimuthally rotated to borehole image/dipmeter data as necessary. Manual dip picking of the traced and classified features is then undertaken. Sleeve goniometry can be performed on half-cut, three-quarter-cut and full core.
Significantly greater accuracy and detail can be captured from the 360° photograph goniometry method. Supplied 360° core photographs are loaded into TerraStation software where they are spliced, referenced to the borehole deviation and azimuthally rotated as per the traditional method. The photograph method is less time consuming, which means that core viewing room rental facilities are kept to a minimum, and most importantly, many more geological features can be identified and oriented with greater accuracy.