The past few years have seen an increasing in the use of geophysical methods to delineate the reservoir as well as to monitor its production history. Since the material changes in a reservoir; over time should alter its geophysical signature, it should be possible to produce time-lapse maps of the evolution of secondary and tertiary recovery processes. While current emphasis in the industry tends to emphasize the search for new oil and gas fields, substantial hydrocarbon reserves await discovery in existing mature oil fields. Thus, Fisher (1987) has estimated that some 80 Bbbl, of oil remain in place in existing U.S. oil fields, and are targets for infill drilling. Changing economic as well as political conditions may well make the search for wich resources as attractive proposition in the future. In order to the prepared for that day, our industry needs to undertake the R&D required to reduce the appropriate geophysical methods to practice and ready in place when required.


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