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This web site oil-gaz.org had the following on the site, "Types of primary drive mechanisms of hydrocarbon reservoirs." We noticed that the webpage said " The reservoir drive mechanism supplies the energy that moves the hydrocarbon located in a reservoir toward the wellbore and with time whi." It also said " Reservoir porosity and permeability lab measurement. The measurement of permeability forms the basis for many engineering and geological engineering investigations. Petroleum basic drill string standards. Petroleum oil and gas wells perforation design." The header had Oil-Gaz.org as the highest ranking optimized keyword.