A method of processing geological log data obtained from use of one or more logging tools and including at least a first log having a relatively poor attribute and a corresponding, second log having a relatively good said attribute comprises the step of incorporating into the first log characteristics of the second log that confer improvements in the said attribute, characterised in that the incorporating step includes modulating the extent of incorporation into the first said log of the said characteristics without distorting geologically significant information in the first log.