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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 64 (1980)

Issue: 3. (March)

First Page: 427

Last Page: 430

Title: Depositional Environment of Source Beds of High-Wax Oils in Assam Basin, India: GEOLOGIC NOTES

Author(s): M. M. Saikia, T. K. Dutta (2)


The high-wax Assam oils are found in sand-shale rocks of Tertiary age. The association of the oils with coal and carbonaceous sediments suggests a nearshore or paralic environment in which substances relatively rich in wax and aromatic components were deposited. Sharp variations in wax content from field to field in the Assam basin indicate that little or no migration of oil occurred. Oligocene organic mudstones and shales, rather than the open-marine Eocene Jaintia formation, are the probable source rocks for these syngenetic oils.

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