ABSTRACT: Genesis of petroleum systems in Krishna-Godavari Basin, India

Gupta, S.K.¹, S.K. Mazumdar², and B. Basu²
(1) Oil & Natural Gas Corporation Ltd, Dehradun, U.P, India 
(2) Oil & Natural Gas Corporation Ltd, Delhi, India

Krishna-Godavari Basin, located on the eastern seaboard of India is a passive margin basin with sedimentary fill ranging in age from Jurassic to Pliocene corresponding to Pre- Syn- and Post-rift stages of basin evolution. The hydrocarbon habitat of the basin is related to five distinct petroleum systems linked with the tectono-stratigraphic evolution of the basin. The oldest Kommugudem-Mandapeta System is sourced by lower Permian Coal-Shale sequence. The gas accumulations are mainly in structural traps in Upper Jurassic to Lower Cretaceous reservoirs. The Gajulapadu-Kanakollu System is sourced by the Lower Cretaceous lacustrine shale with marginal marine sandstone as the main reservoir; the entrapment is mainly strati-structural. The succeeding Raghavpuram-Tirupathi System is sourced by widely developed Upper Cretaceous shale. The entrapment is restricted to lenticular sands within the source sequence. Palakollu-Pasarlapudi System, the oldest of the tertiary petroleum systems is sourced by Palaeocene/Eocene marine shale with Lower to Middle Eocene deltaic sands forming major reservoirs of gas in structural and stratigraphic traps. The Vadaparru-Ravva System, the youngest in the basin, is confined to coastal and offshore areas with Eocene marine shale as the main source. The accumulations (oil and gas) are in large strati-structural traps in Mio-Pliocene reservoirs.

AAPG Search and Discovery Article #90913©2000 AAPG International Conference and Exhibition, Bali, Indonesia