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Nuclear Magnetic Resonance Permeability Comparison to Image and Production Data in Secondary Porosity Conditions
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 74th EAGE Conference and Exhibition incorporating EUROPEC 2012, Jun 2012, cp-293-00392
- ISBN: 978-90-73834-27-9
Abstract
The Bray-Smith equation for direct calculation of permeability from the nuclear magnetic resonance (NMR) T2 response was recently applied in several different, difficult reservoirs with excellent results. The expected production rates from calculated permeability compared closely to actual production rates. Secondary porosity from fractures or vugs complicates the ability to establish an accurate permeability value. Fractures that are open or filled can have the same characteristic log signature on conventional logs, or they may remain undetected by these standard logs. Vugs can develop as isolated features, or can be well connected to create excellent petroleum reservoirs. An adequate description of these characteristics is desirable. This paper compares the magnetic resonance permeability from the Bray-Smith equation to actual production results in open, healed, and drilling-induced fractures. It also demonstrates these responses in connected vugs, as well as in situations in which the vugs do not interconnect (oomoldic reservoirs).