Geology Case Study - Challenges In Thrust-Belt Exploration

Jun 30th, 2015
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The thrust-belt areas lying in East and South-east part of the Upper Assam Basin, India are a geologically prospective province in terms of hydrocarbon resources. Over the years few oil fields have been discovered in these areas. The continuous endeavor to unravel the complex subsurface geology in and around these thrustbelts has led to a series of

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Challenges In Thrust-Belt Exploration - A Case Study From Upper Assam Basin, IndiaK.L.Mandal, D.S.Manral and A.K.Khanna, Oil India Limited, Duliajan, AssamABSTRACTThe thrust-belt areas lying in East and South-east part of the Upper Assam Basin, India are a geologically prospective province in terms of hydrocarbon resources. Over the years few oil fields have been discovered in these areas. The continuous endeavor to unravel the complex subsurface geology in and around these thrustbelts has led to a series of seismic survey campaigns in the quest for hydrocarbon resources. There are a few success stories, however these are still limited, primarily because of poor imaging of subsurface geology. Severe constraints in terms of difficult logistics & complex subsurface geology make seismic dataacquisition and processing programs challenging for imaging of subsurface geology. We present a case study over a part of these thrust belt areas, where a fresh seismic campaign had been carried out recently based on the geological leads of previous seismic survey to obtain improved subsurface images. Ingenuity in planning, effective implementation of the survey design, stringent quality control measures, fitfor-purpose operational methodology & seismic data processing has enabled in achieving the primary objectives of imaging the Girujan and Tipam formation of Oligocene age in the area. The structural geometry of the subsurface features of interest in hydrocarbon exploration co

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