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Bhaktavatsala, K. V.
- Sequence Biostratigraphy: A Case Study from the Godavari Shelf, India
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Authors
Affiliations
1 Oil and Natural Gas Corporation Ltd., 3, First Lane, N.H. Road, Chennai - 600 034, IN
1 Oil and Natural Gas Corporation Ltd., 3, First Lane, N.H. Road, Chennai - 600 034, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 56, No 2 (2000), Pagination: 183-198Abstract
Quantitative foraminiferal data in a temporal succession identifies a type 1 third order Miocene depositional sequence (Ravva Formation/Sequence) of sechron ∼6 Ma in Godavari shelf area. This sequence has developed as a shelf delta build-up. This sequence is divided into a transgressive systems tract (TST) and a highstand systems tract (HST) separated by a maximum flooding surface (MFS), based on faunal frequency trends. The TST plays host to all reservoir facies, suggesting that the sand depocentres have migrated landward, concurrent with progress of the transgressive phase. The Ravva Sequence is bounded below by a type 1 unconformity spanning ∼7 Ma across the Oligocene-Miocene boundary. This unconformity surface hosts reservoir facies in well GS-AE-D. The sequence is bounded above by a type 1 unconformity of ∼10 Ma across the Miocene-Pliocene boundary. This unconformity is a diachronous surface produced by a progradational highstand systems tract. This surface represents possibly the only period during the Neogene, where large quantities of middle to late Miocene sediments may have by- passed the shelf. These by-passed sediments, according to the proposed sequence depositional model, should occur as Iowstand systems tract deposits (shelf edge deltas and fan deposits).Keywords
Sequence Stratigraphy, Sequence Boundary, Systems Tracts, Maximun Flooding Surface, Sechron, Miocene, Godavari Offshore.- Sequence Stratigraphy and Depositional Process of Miocene Sediments in KD-structure, Deepwaters of Krishna-Godavari Basin, India
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Authors
Affiliations
1 Regional Laboratory, ONGC Ltd., N.H. Road, Chennai - 600 034, IN
1 Regional Laboratory, ONGC Ltd., N.H. Road, Chennai - 600 034, IN