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The value of fieldwork in making connections between onshore outcrops and offshore models: an example from India

By
Andy Racey
Andy Racey
Andy Racey Geoscience, 5 Norris Close, Bordon, Hampshire GU35 9EG, UK
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John Fisher
John Fisher
Genel Energy, 1 Grafton Street, London W1S 4FE, UK
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Haydon Bailey
Haydon Bailey
Network Stratigraphic Consulting, Harvest House, Cranborne Industrial Estate, Cranborne Road, Potters Bar, England EN6 3JF, UK
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Sandip Kumar Roy
Sandip Kumar Roy
A-503, Radhe Tower, Pashabhai Park, Baroda-39007, India
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Published:
January 01, 2016

Abstract

Fieldwork provides an efficient and economical way of obtaining genuine geological data that can be used to constrain, test and develop exploration models in frontier areas. This study of the Cretaceous outcrops of NW India has been used to characterize models for petroleum systems postulated to have developed beneath the Deccan volcanic sequence, offshore western India, where well data are not available. To date, exploration of ‘sub-Deccan plays’ has mainly been limited to the NW, where the presence of a working Cretaceous petroleum system has been proven in the offshore Kutch Basin.

A revised chronostratigraphic framework has been defined for the Cretaceous section as a result of new biostratigraphic data collected during this study and a thorough revision of existing palaeontological data. The revised framework, together with lithofacies observations from the field, has provided a basis for regional sequence stratigraphic correlation, which has been used to link data from onshore outcrops to models of offshore petroleum systems.

A Lower Cretaceous clastic package that, in part, corresponds to the Lower Goru and Bhuj Formation reservoirs of the Indus Basin of Pakistan and the Kutch Basin in India has been correlated across the region. Towards the top of this package, a transition from fluvial to shallow-marine sedimentation marks the onset of a marine transgression that reaches its peak in the Turonian. Marly limestones and claystones associated with this regionally mapped event are a potential topseal to the Lower Cretaceous clastic package. Geochemical evaluation of several outcrop locations has identified potential source-prone facies that, if present downdip in the offshore, may provide a mechanism for charging a pre-Deccan play.

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Geological Society, London, Special Publications

The Value of Outcrop Studies in Reducing Subsurface Uncertainty and Risk in Hydrocarbon Exploration and Production

M. Bowman
M. Bowman
Texas A&M University, Qatar
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H. R. Smyth
H. R. Smyth
Neftex Exploration Insights, UK
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T. R. Good
T. R. Good
ExxonMobil, UK
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S. R. Passey
S. R. Passey
CASP, UK
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J. P. P. Hirst
J. P. P. Hirst
Sedimentology Consultant, UK
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C. J. Jordan
C. J. Jordan
British Geological Survey
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Geological Society of London
Volume
436
ISBN electronic:
9781786203090
Publication date:
January 01, 2016

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