ROCK PHYSICS FROM SMALL SAMPLES -SOMETIMES YOUR ONLY SOLUTION

ABSTRACT This paper illustrates the potential of using small shale samples, including cuttings, as a tool for determining rock physical parameters on field material. The measured static and dynamic mechanical results are basically consistent with those attained on larger, standard plugs in triaxial cells. Consequently, small samples can be used as a complementary tool to larger samples, providing faster and less expensive results with less material consumption, also allowing for larger test matrices. In some cases, use of small samples may actually be the only solution to obtain direct measurements on the shale material. INTRODUCTION To reach hydrocarbon reservoirs, one often has to drill through various shale sequences. Borehole stability problems may occur while penetrating these shale sections, potentially adding substantial costs to the drilling operations. In order to optimise the drilling procedures, this calls for a better rock physical characterization of the shales, as well as an understanding of how factors like mud composition affect the shale properties