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The Digboi oil field is in northeastern Assam on a faulted elongate anticline in rocks of the Tipam series (middle Miocene). The three main producing formations are the Bappapung sandstone, the Nahor oil sand, and the members of the Digboi oil sand group. There is pronounced lateral variation, and permeabilities are very low. As a result, productivity is very variable and it has been necessary to use very close spacing. The oil is remarkable for its high pour point, 95° F., and high wax content. Brief reference is made to several problems, including the difficulty of differentiating oil, gas, and water-bearing sands in electrical surveys because of the low salinity of the formation waters, paraffination, loss of circulation while drilling, and migration of oil into t e structure from the Barail (Eocene-Oligocene) beds below.
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