oa Quantifying the Uncertainty of the Depth Where Imaging is

Along-hole depth is the most fundamental subsurface measurement made in our business. When regarding imaging information, or any subsurface information, not knowing the along-hole depth or the uncertainty of the depth value provided renders the information of limited value. New along-hole depth measurement theory and practices and new ways of calculating uncertainty of depth measurements are presented that address the assumptions that are otherwise made. This results in quantified uncertainty rather than guessed or assumed values which can be matched to the uncertainty requirements of the data users. The matching of the methodologies used in measurement to the requirements results in an uncertainty budget that is arrived at by design rather than by assumption of guesswork.