3. How much oil is in our reservoir? We will make a very simplistic assumption -

Question

3. How much oil is in our reservoir? We will make a very simplistic assumption - the Oil Reservoir is a perfect b space filled with liquid oil. This "Brent" box is the following (based on actual dim ensions) (1) The "pool" of oil reservoir spans 200 shot points in width (horizontal) Shot points (the numbers at the top) are typically 25 meters apart. (2) The "pool" of oil reservoir is an elongated structure that extends 10 mile: (sor British field, distance is "miles") in the perpendicular length (into the paper) (3) The reservoir sands are 200 meters thick. (4) The reservoir sandstone has only 15% porosity, and it is all filled with oil. ry, as a (5) The ultimate recovery, using secondary techniques, is 2/3rds of that oil. (a) Make an appropriate-sized box (width, depth) on figure 4.2 where you have predicted the oil. (b) What is the estimated volume of the Oil in this sand reservoir (to the nearest 50 million barrels)?

Explanation / Answer

Length of the box = 200 shot points with 25 m apart for each two points. length of the box = 200 x 25 m = 5000 m Breadth of the box = 10 miles = 10 x 1609.34 = 16.09 m depth of the reservoir = 200 metres. voids = 15% net depth of reservoir = 15 % of 200 = 0.15 x 200 recovery = 2/3 of the volume of oil. net volume of oil = 2/3 x length x breadth x net depth 2/3 x 5000 x 16.09 x 0.15 x 200 =1609000 cum. = 1609000 x 264.172 gallons divided by 42 gallons yield number of barrels = 10120303.523 = 10 million barrels

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