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We are familiar with the recent surge in oil and gas from unconventional oil and reservoirs. What we are less familiar with is the fact that conventional tools do not apply to unconventional reservoirs. Even less known is the fact that conventional characterization tools don’t accurately represent even the conventional reservoirs. Chapter 5 takes a fresh look at all types of reservoirs and offers practical guideline for scientific characterization. It turns out that inherent features of conventional reservoirs are often a less complicated version of those of unconventional reservoirs. This finding eluded others because of the presumption that the reservoir characterization tools are adequate for most reservoirs, unless there prevails extraordinary complexity in terms of rock and fluid properties. A newly developed reservoir characterization tool is presented in Chapter 5.