--> Abstract: Paleocene Deepwater Frontal Spalys, Cretaceous Pre-Basaltic Tilted Half — Grabens and their Significane in Hydrocarbon Prospectivity, Kerala-Konkan Basin, Western Offshore, India, by Panda, Dillip K.; Sahu, Santosh K.; Jha, Dilip K.; Sundriyal, Ratiram; Ram, Ganga; #90163 (2013)
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Paleocene Deepwater Frontal Spalys, Cretaceous Pre-Basaltic Tilted Previous HitHalfNext Hit — Grabens and their Significane in Hydrocarbon Prospectivity, Kerala-Konkan Basin, Western Offshore, India

Panda, Dillip K.; Sahu, Santosh K.; Jha, Dilip K.; Sundriyal, Ratiram; Ram, Ganga

The Kerala-Konkan Basin has developed due to separation of India and Madagascar along Vishnu fracture zone which initiated during Creataceous, 85 Ma. The sediment sequences have been interrupted by basalt flows during Cretaceous to Paleocene and intrusives. The hydrocarbon exploration in this basin have been restricted to continental shelf set-up on one hand and Tertiary sediments on the other. The Meszoic exploration in the basin have been deterred due to presence of layers of igneous rocks below Paleocene sediments, as the imaging of Mesozoic sediments remained enigmatic.

Sub-basaltic tilted Previous HithalfNext Hit grabens have been imaged and mapped with the help of new 3-D seismic data by capturing low frequency content in "Q-enabled over and under" seismic acquisition technique. These Previous HithalfNext Hit-grabens suggest the extension of Keral-Konkan rift basin upto 15oN latitude. The basin had undergone upliftment and erosion during Creataceous as represented by angular unconformity in seismic sections in this part. Two sequences mapped below the Deccan Trap basalt have brought out a fault induced low amplitude structure in the Cretaceous tilted Previous HithalfTop graben.

Paleo-bathymetry maps and depositional setup during Paleocene for the basin were reconstructed integrating paleo shelf-edges mapped from seismic sections, sedimentological studies and core analysis of drilled wells as well as the present day bathymetry. The continental shelf width during E. Paleocene was much narrower compared to present day which was most favourable condition for deep water sedimentation as Frontal Splays. These frontal Splays were deposited proximal to slope base as unconfined channels having shorter /no levee on feeder channel and were deposited in Late Falling Stage Systems Tract.

Time slice, proportionate slice and seismic attribute like Average Absolute Amplitude, Maximum Absolute Amplitude of the Lr. Paleocene section indicated a geobody lying above Deccan Trap Basalt. Wave form analysis, sweetness attribute have been analysed for qualitative analysis of reservoir quality and identifying the proximal, distal and mid-fan areas of frontal splay.

The rifting as imaged in sub-basalt section increases the hydrocarbon prospectivity of Cretaceous-Paleocene petroleum system. Fault induced low amplitude structures, Angular unconformity related plays in Upper Cretaceous and Frontal Splay in Early Paleocene are suitable leads for hydrocarbon accumulation.

 

AAPG Search and Discovery Article #90163©2013AAPG 2013 Annual Convention and Exhibition, Pittsburgh, Pennsylvania, May 19-22, 2013