--> Abstract: Cauvery Basin - Southern India: Petroleum Geology and Hydrocarbon Habitat, by V. Vairavan, K. G. Vijayalakshmi, Y. E. R. Sastri, M. S. N. Sarma, and P. N. Ananthanarayanan; #90942 (1997).

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Abstract: Cauvery Basin - Southern India: Petroleum Geology and Hydrocarbon Habitat

VAIRAVAN, V, K.G. VIJAYALAKSHMI, Y.E.R. SASTRI, M.S.N. SARMA, P.N. ANANTHANARAYANAN

Cauvery Basin, in the southeastern part of India, evolved as a typical passive margin basin initiated in Late Paleozoic / Early Mesozoic as rift phase followed by Late Mesozoic rift-drift transition and Tertiary drift phase.

Sedimentation history is closely linked to the tectonic events punctuated with major regional unconformities at the end of Albian, Turonian, and Maastrichtian and Middle Eocene, Oligocene / Miocene time. Rift fills characterized by nonmarine lacustrine facies of Permian / Jurassic - Early Cretaceous period were restricted to the northeast-southwest-oriented grabens. Rift-drift transition sedimentation covered major part of the basin, including transgressive shales and arenaceous sequences. Tertiary drift phase deposition extended over the entire basin, consisting of shelf-slope prograding sequences.

The lacustrine shales of the rift phase and transgressive shales of rift-drift phase constitute the major source facies. Reservoir facies in Cretaceous, Paleocene, Eocene and Oligocene sequences were deposited as deep-water turbidites, canyon fills, slope sediments and shallow-marine shelfal sheets / bars.

Play analysis revealed accumulations in reservoirs juxtaposed to source facies, suggesting short distance migration. Proximity of Cretaceous source to Cretaceous and younger reservoirs in a half graben setting appears to be the preferred hydrocarbon habitat. More petroleum accumulations are likely to be in similar settings onland and in deep-water offshore, flanked by basement ridges.

AAPG Search and Discovery Article #90942©1997 AAPG International Conference and Exhibition, Vienna, Austria