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It is now commonplace for non-destructive X-ray computed tomography (CT)scans to be taken of core recovered during a drilling project. However,other forms of tomographic scanning are available, and these may beparticularly useful for core that does not possess significant contrasts indensity and/or atomic number to which X-rays are sensitive. Here, we compareCT and neutron tomography (NT) scans of 85 mm diameter core recovered duringthe first phase of the Deep Fault Drilling Project (DFDP-1) through NewZealand's Alpine Fault. For the instruments used in this study, the highestresolution images were collected in the NT scans. This allows clearerimaging of some rock features than in the CT scans. However, we observe thatthe highly neutron beam attenuating properties of DFDP-1 core diminish thequality of images towards the interior of the core. A comparison is alsomade of the suitability of these two scanning techniques for a drillingproject. We conclude that CT scanning is far more favourable in mostcircumstances. Nevertheless, it could still be beneficial to take NT scansover limited intervals of suitable core, where varying contrast is desired

scientific drilling

A comparison of the use of X-ray and neutron tomographic core scanning techniques for drilling projects: insights from scanning core recovered during the Alpine Fault Deep Fault Drilling Project