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“A reservoir in the geological sense is that portion of a sand-body or other rock in place, with pores of sufficient number and size as to be capable of holding and yielding a commercial quantity of oil or gas if they are present. It includes the whole porous volume whether it contains water, oil or gas.” -Johnson, 1916




Johnson, Roswell H. Principles of Oil and Gas Production (New York, NY: John Wiley & Sons, Inc., 1916)


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