| 摘要 |
For a formation zone of a well, a method for determining the relationship between bulk volume of oil phi o as a function of total effective formation porosity phi E and height h above the oil water contact from capillary pressure data of a core taken from the formation of the well is disclosed. The disclosed relationship of the form, phi o=C phi E-K+g log h where C, K and g are constants derived from the capillary pressure data of the core and the relationship between h and the capillary pressure is affected by the relative densities of the connate water of the zone and the oil in the zone. In a well which has been produced and no phi E log exists, the original bulk volume of phi o is determined from the Rt log in cooperation with the core data relationship between phi o, phi E and h through the relationship, <IMAGE>
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