A Relook on
Structural Style and Sedimentation Pattern: Implications on Lithostratigraphy
and Hydrocarbon Prospectivity for Already Explored and New Plays of
Krishna-Godavari and P-G
Graben,
India
Rawat, Sushma1,
K.B Trivedi2 (1) Oil and Natural Gas Corporation Ltd,
Dehradun,
India (2) GNPOC,
Khartoum,
Sudan
Krishna-Godavari basin is marked by a conspicuous bite on
eastern seaboard of
India. It has evolved as a result of Mesozoic
rift and subsequent drift of Indian plate after breakup of Eastern
Gondwanaland. The structural grain of basin is aligned parallel to North-East
aligned passive continental margin. The tectono-sedimentation cycles are very
well depicted in stratigraphic record and each stage has contributed for
components of different petroleum system. Till now five petroleum systems are
being identified, which are under active exploration and development in this
basin.
The sedimentation took place in the NE-SW aligned horst-grabens
where facies mosaic is influenced by tectonically induced slope resulting from
hanging wall down tilting and footwall uplift
Authors have studied 28 wells along with
seismic data of more then 1750 L.Km. and has conclusively established the process
response model and assessed the potential of hydrocarbon generation. A new
play for “deep basin gas” which is still unexplored along with definition of
lithounits based on new tectono-sedimentation model is proposed for this hitherto
moderately explored
basin of
Late Jurassic–Early Cretaceous age. This regionally pervasive
abnormally pressured gas accumulation is expected to be preserved in low
permeability reservoir. The integrity of capillary pressure seals over a
period of tectonic activity is analysed and discussed along with associated
exploration strategy needed for exploration of this new play. This study will
lead to substantial commercial accretion of hitherto unknown and accounted
Hydrocarbon.
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