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Anamalous Low Resistivity Tipam Sands of Assam India and their Observed Petrophysical Aspects
Formation evaluation of low resistivity fresh water sands of Assam, India is a complex problem. The poor resistivity contrast and at times reverse resistivity contrast between hydrocarbon and adjacent water bearing layers have further complicated the case. Available logging methods have made very little headway in the identification & evaluation of hydrocarbons in these sands. The paper discusses the effect of clay & clay coating in fresh water on the formation factor ‘F’ saturation exponent ‘n’ & their consequences.
This paper emphasises that a comprehensive core study can help in better understanding of reservoir and thus making a room for the development of a suitable interpretation model. Similar type of study in every reservoir of its kind may further help in building a unified approach for solving such typical reservoir problem.
It has been observed that ‘n’ attains a surprisingly low value at apparent formation water salinity. The Archie’s F-Ø relation is vitiated at such fresh water salinity. The cause of poor to reverse resistivity contrast and anomalous petrophysical inter-relationship is attributed to the enhanced role of clay, clay coating in fresh water sands, and possibly to the microporosity to some extent.
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