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Figure 2 – (a) Overlay a net oil base map on the structure map of the top reservoir (top of porosity). The oil/water contact is traced on the overlay. (b) The oil/water contact becomes the zero contour line on the net oil isochore map. (c) Overlay the net oil isochore map on the structure map of the base of the reservoir (base of porosity), and trace the oil/water contact as a dashed line. (d) Isochore base map delineating the two major areas comprisind the net oil isochore map: (1) oil wedge from the zero line to the inner limit of water (oil/watercontact on the base of the reservoir) and (2) the area of full hydrocarbon thickness. (e) To contour the full thickness area, superimpose the net oil isochore map on a net sand isochore map and trace the net sand contours inside the inner limit f water (dashed line). (f) Net oil isochore map with contours drawn for the oil-filled area. (g) All full thickness area contours that intersect the inner limit of water must connect through the wedge with contours of equal value. (h) Completed net oil isochore map with important points of isochore construction listed.
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Figure 2 – (a) Overlay a net oil base map on the structure map of the top reservoir (top of porosity). The oil/water contact is traced on the overlay. (b) The oil/water contact becomes the zero contour line on the net oil isochore map. (c) Overlay the net oil isochore map on the structure map of the base of the reservoir (base of porosity), and trace the oil/water contact as a dashed line. (d) Isochore base map delineating the two major areas comprisind the net oil isochore map: (1) oil wedge from the zero line to the inner limit of water (oil/watercontact on the base of the reservoir) and (2) the area of full hydrocarbon thickness. (e) To contour the full thickness area, superimpose the net oil isochore map on a net sand isochore map and trace the net sand contours inside the inner limit f water (dashed line). (f) Net oil isochore map with contours drawn for the oil-filled area. (g) All full thickness area contours that intersect the inner limit of water must connect through the wedge with contours of equal value. (h) Completed net oil isochore map with important points of isochore construction listed.