method of calculating rise in oil-water contact by material balance equation

[hojbarnaz]

Dear all
i just want to know is there any way to deduce how much rise in oil water cotact has occured due to production in water drive reservoir using material balance equation. If any method exist please provide an example

[catapam]

This is applicable for IPM - MBAL
Search for Pore Volume vs. Depth in help

I copy&pasted for you:
"
Material Balance analysis for reservoirs is based on treating the system as a dimensionless tank. The traditional approach does not allow account for contact movements, either gas oil contact or oil water contact, as no geology is provided.

In MBAL the addition of Pore Volume vs. Depth table introduces a means of allowing contact movements. Pore volume is directly related to saturations of phases in the reservoir and these in turn are related to a given depth through this table.

Let us assume a situation where an aquifer is providing support to an oil reservoir. The aquifer will provide water that will encroach in the tank, thus increasing the water saturation. In classical material balance calculations, the water saturation in the tank will increase as a single number (no variation of Sw in the reservoir). However, if the increase in water saturation is related to a pore volume fraction, then the increase in the OWC can be calculated based on the PV vs. Depth table.

This tab is enabled only if the Monitor Contacts option in the Tank Parameters data sheet has been activated. The table displayed is used to calculate the depth of the different fluid contacts. This table must be entered for variable PVT tanks
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You need to provide some depths in that table such as:
- top of the reservoir
- gas-oil contact (if there is one)
- water-oil contact