--> ABSTRACT: Comparative Study of Krishna-Godavari and Niger Delta Regions and Geological Development of Hydrocarbon Pools in These Basins, by Nigotia, Sakshi; Pande, Akansha; Misra, Kiran S.; #90135 (2011)

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Comparative Study of Krishna-Godavari and Niger Delta Regions and Geological Development of Hydrocarbon Pools in These Basins

Nigotia, Sakshi 1; Pande, Akansha 1; Misra, Kiran S.1
(1)Petroleum and Earth Sciences, University of Petroleum and Energy Studies, Dehradun, India.

Geological similarities and dissimilarities between the Krishna-Godavari(K-G) basin along the eastern coast of India and Niger basin situated along the west coast of Africa. These basins represent major hydrocarbon pool regions of the world. Similarities found between these basins are in respect of, the basin forming and basin modifying tectonics, stratigraphy, nature of rift related volcanism, shale diapierism and mobility, gravity related growth faults and trapping mechanism.

The basin forming tectonics in K-G basin is related to Pranhita-Godavari graben and basin modifying tectonics is along East Coast Fault Zone. In exact corollary, Niger basin has developed along Niger rift and modified by faults parallel to the coast. Due to compounding effect of these two subsiding tectonic features, rapid subsidence and accumulation of enormous sedimentary sequence has taken place. K-G basin has multiple source rock of different geological ages, while in case of Niger basin the source rock is mainly Akata shale formation which has a composition of marine mudstone, interbeded silt and sand. Similarly reservoir rock in K-G basin are varied while in Niger delta the reservoir rock is early Agbada shales, which comprises coastal , fluvial and marine sediments. Marine transgressions during Cretaceous period took place in both these basins and seems to have played an important role in development of petroleum systems. It has also emerged that volcanics which is essentially rift related are present in both these basins .The volcanic plugs and craters are located on the south western rift margin along Niger basin where it is described as Cameroon line. In case of K-G basin the plugs and volcanic cones are located along the north eastern boundary within the Rajahmundry volcanics. Gravity related growth faults which are essentially parallel to the coast line have played important role both in development of petroleum systems as well as hydrocarbon pools. Furthermore, both the delta regions are dominated by Tertiary rocks with clastic inputs.

The geological history of K-G basin is much longer and started since the beginning of Permocarboniferous time, while Niger basin has started during the late Jurassic. The important dissimilarity observed during this study is that the rate of subsidence was much higher in Niger basin where it has reached to a thickness of nearly 10 kms while in case of K-G basin it is ranging between 4 to 7 kms.

 

AAPG Search and Discovery Article #90135©2011 AAPG International Conference and Exhibition, Milan, Italy, 23-26 October 2011.