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Authors
Affiliations
1 Regional Interpretation Section, ONGC, Na-Ali, Jorhat - 785 001, IN
2 ONGC, MRBC, Mumbai, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 51, No 5 (1998), Pagination: 647-658
Abstract
Reflection seismic facies analysis pertaining to southern part of Katakhal syncline, Cachar Fold Belt, Assam, has brought out an anomalous zone of chaotic reflections bounded by high amplitude, continuous, correlatable reflection events. This anomalous zone displays an elliptical shape in plan view and is aligned with the associated folds. The genesis of this anomaly, developed along the eastern flank of the syncline, bracing the synclinal axis is assigned to the non piercement type of shale diapirism within Middle Bhuban Formation of Middle Miocene age. The geological model envisaged has further led to the delineation of supra and lateral diapiric traps in the overlying Upper Bhuban and Bokabil Formations of Mio-Pliocene age. The reconstruction of structural evolution has brought out a phase of inversion during Plio-Pleistocene where the anticlines within Miocene and Mia-Pliocene sequences turned into synclines. The delineated supra and lateral diapiric traps have not been obliterated during inversion episodes. The identified prospects are new type of plays to be tested in Cachar Fold Belt, and form a step forward in focusing the thrust areas of exploration on the gentler synclinal flanks
Keywords
Petroleum Geology, Cachar Fold Belt, Hydrocarbon, Assam.
