Abstract
One of the problems when evaluating potential borehole stability problems in the drilling of hydrocarbon exploration and production wells is the lack of relevant data to describe the lithologies. This relates in particular to the shales, since these constitute most of the overburden and are also the most troublesome. This paper presents a set of data from a variety of deeply cored shales from the North Sea. The shales have been extensively characterised and span a wide range of both petrophysical and mechanical properties, depending on, for example, burial history and diagenesis. Special characteristics of shales have been tested and described, including pore size distribution, permeability, anisotropy and temperature dependence. Appropriate procedures for sample handling, testing and interpretation have been developed or modified from other related sciences.
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