Method for determining reservoir bulk volume of hydrocarbons from reservoir porosity and distance to oil-water contact level
US4903207A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 14, 1988 |
| Grant date | Feb 20, 1990 |
| Priority date | — |
| Expiry date | Apr 14, 2008 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B49/005
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
For a formation zone of a well, a method for determining the relationship between bulk volume of oil .phi..sub.o as a function of total effective formation porosity .phi..sub.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, EQU .phi..sub.0 =C.phi..sub.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. According to an alternative embodiment of the invention, log data may be used to characterize a well according to the relationship EQU .phi..sub.0 =C.phi..sub.E -K+g log h by using sets of data at different depths in the well with statistical regression methods, where the initial oil-water contact level may be determined from said log data. According to another alternative embodiment of the invention, core data may be used to determine the characterizing relation of a well, where the well does not penetrate the oil-water level of the reservoir as EQU h(z)=10.sup.(.ph…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.