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F is commonly extracted from the counted porosity of one’s creation from the matchmaking
Really logs render insight into the formations and you will requirements on the subsurface, aligned primarily on recognition and you may assessment out of maybe productive perspectives.
Dedication out-of saturation
Liquids saturation ‘s the tiny fraction of pore volume of the fresh reservoir stone that’s full of liquids. It is essentially believed, unless of course otherwise known, the pore frequency not filled with drinking water is full of hydrocarbons. Determining water and you can hydrocarbon saturation is amongst the very first objectives regarding better signing.
Clean formations
All-water saturation determinations off resistivity logs for the brush (nonshaly) structures with homogeneous intergranular porosity are based on Archie’s h2o saturation picture, otherwise variations thereof. [1] [2] The newest picture are
For convenience, brand new saturation exponent n is frequently pulled just like the dos. Laboratory experiments have indicated that this was a good value for mediocre instances. For lots more exacting performs, electricity proportions to the cores commonly establish ideal wide variety getting letter, a great, and yards. Whenever key counted thinking was not available, the costs of a good and you may meters during the Eq. 4 shall be estimated as follows: from inside the carbonates, F=1/? 2 is normally made use of; inside sands, F=0.62/? dos [3] (Simple formula), or F=0.81/? dos (an easier form about equivalent to new Humble algorithm). (more…)