Empirical estimation of uniaxial compressive strength of shale formations

The uniaxial compressive strength of rock (sigma(c)) is an important parameter for petroleum engineers, drilling operations, and all related activities from exploration through to production and abandonment. A thorough understanding of the parameters affecting sc is a basic prerequisite for accurate geo-mechanical modeling of the reservoir and overburden properties. Uniaxial compressive strength plays a significant role in mud weight determination while drilling, especially for a troublesome lithology such as shale. However, standard geo-mechanical practice requires well-preserved core samples for measurement of sc in the lab. Because core samples are not often available, there is a need for alternative methods to obtain fit-for-purpose values of sc, based on other related rock