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Structural Style, Sedimentation Pattern and Evolution of Siliciclastic Dominated Depositional System in Deep Water Area of Krishna-Godavari Basin, India

Anil K. Srivastava, Kaushalendra B. Trivedi, and Narendra K. Verma
INTEG,GEOPIC, Oil & Natural Gas Corporation Ltd., Dehradun, India

Krishna Godavari basin is conspicuous on the map by a bite on the east coast profile of India. The basin came into existence as a result of rift and final drift of Indian plate from Gondwanaland during Aptian-Albian times. The sedimentation pattern in the area under study is greatly affected and modified by various episodes of regional tectonic pulses and readjustments of various stresses which created the topography and guided the sedimentation pattern by providing the accommodation space and inducing the provenance in deep water area .

The area under study falls between 700 to 2500m bathymetry and is covered by 3D data of 2000 Sq.Km. To understand sedimentation dynamics authors carried out window based seismic Previous HitattributeNext Hit analysis using amplitude, reflection strength,Previous HitcoherencyNext Hit and sweetness Previous HitattributeTop volume. Seisfacies analysis, post stack band limited inversion and Geobody mapping using volume based interpretation technique also being carried out to understand spatio temporal distribution of reservoir facies. The model proposed by the studies suggests that during Late Cretaceous maximum sedimentation has taken place in depression off the shelf break in south west,marked by mass transport complex, fan and "channel cut and fill" features in LST. A major tectonic activity is being recorded in Late Oligocene-Early Miocene, resulting in steeper dips towards south. This associated with a local transpressional tectonic activity were responsible for the creation of series of prograding longitudinal faults and associated accommodative popup Structure.

These stratistructural analysis in this hitherto lesser explored area of deep water has opened up a vast no. of probabilities for hydrocarbon exploration in various geological settings, and will reducethe risk of failure in costly gambit of exploration in deep water.


AAPG Search and Discover Article #90078©2008 AAPG Annual Convention, San Antonio, Texas