Quantitative Monitoring of Gas Flooding in Oil Bearing Reservoirs Using a Pulsed Neutron Tool

摘要

A new method has been developed to monitor gas flooding of oil reservoirs. The method is based on computing two porosities: the base true porosity determined before gas flooding and monitor apparent neutron porosity determined after gas flooding. The base and monitor porosities provide determination of a hydrogen index of the reservoir fluid after the flooding. The hydrogen index is then used to determine saturation of the flood agent after flooding and consequently, saturation of water and oil after flooding. An example of quantitative analysis of base and monitor logs illustrates monitoring of CO_2 flooding using the described method.