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Firoze Dotiwala1, Sucheta Dotiwala1, D.S Mitra1, A.K. Mullick2
(1) Remote Sensing and Geomatics, KDMIPE, Oil and Natural Gas Corpn. Ltd, Dehradun, India
(2) Remote Sensing and Geomatics, KDMIPE, Oil and Natural Gas Corpn. Ltd

Abstract: A Study Of The Lineament Fabric Of The Mikir Hills Using Satellite Remote Sensing Data On A GIS System For Inputs To Exploration In The Dhansiri Valley, Assam, India

Remotely sensed satellite imagery is one of the various data sets, which provide valuable inputs in exploration for hydrocarbons. The present study has been carried out on a GIS system, using a number of data sets, namely, Landsat TM and ERS-1 SAR data for lineament and neotectonic inputs, surface geological data, Bouger gravity and subsurface data to understand the geological problems.

The Kalyani River - Barhalla lineament is a major ENE trending lineament, cutting across the entire Mikir Hills that continues across the Dhansiri Valley upto the Schuppen Belt. The study shows that it is an old geofracture that has been active in recent times. The reactivation of the ENE trend may contribute to the hydrocarbon plays in the basement or younger level related structural traps.

The southern part of the Mikir Hills, which is in close proximity of the Dhansiri Valley, shows the development of WNW-ESE lineaments. Therefore, in the southwestern part of the Dhansiri Valley the presence of WNW-ESE basement trend is expected and needs to be examined in subsurface data.

The effect of the Kalyani River - Barhalla Lineaments and the Diagurung River Lineament on the advancing Naga Thrust front shows lateral ramping south of Barhalla Town. This lateral ramping of the Naga Thrust can be assigned to the persistent basement high between these lineaments. The producing Borholla - Champang field is at the northern end of this lateral ramp. The identified Merapani and Kasomarigaon anomalies associated with major easterly lineaments from the basement producing Borholla field. Therefore, these anomalies need to be examined for hydrocarbon entrapment.

AAPG Search and Discovery Article #90914©2000 AAPG Annual Convention, New Orleans, Louisiana