There is no such thing as a typical unconventional reservoir, they can be shallow or deep, with high or low pressure, high or low temperature and contain single or multiple layers. New technology is required to understand these unconventional reservoirs containing heavy oils, tar sands, shales, coals and gas hydrates the properties of which demand more accurate and complex rock physics solutions and models.
Petrophysical challenges include
–Low porosity
–Clay content, distribution
–Variable mineralogy
–High TOC (kerogen)
–Analytical procedures
–Saturation
–Mechanical properties