--> Abstract: Solution for Imaging in Logistically Constraint Areas: A Case Study from Upper Assam, by Koustav Dasgupta, Rahul Dasgupta, Mayank Banerjee, Anup Kumar, and Subhodeep Maji; #90081 (2008)
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Solution for Imaging in Logistically Constraint Areas: A Case Study from Upper Assam

Koustav Dasgupta, Rahul Dasgupta, Mayank Banerjee, Anup Kumar, and Subhodeep Maji
Geophysics, Oil India LTD, Duliajan, District Dibrugarh, India

The study area falls within the operational areas of Oil India Limited at Upper Assam. A discovered oil and gas field is present in the area. The area is characterized by presence of a national park at its north where Previous HitseismicNext Hit activity is prohibited. Additionally, the area, at its west and south, is bounded by a swamp, where conventional Previous HitseismicNext Hit survey is not possible. The swamp was more than 10 kms long and upto 2 kms wide at places. These are the constraints of Previous HitseismicNext Hit survey in the area. Thus, innovative 2D/3D Previous HitseismicNext Hit data acquisition was necessary to cover the area meaningfully by Previous HitseismicNext Hit.

The area was covered by Previous HitseismicNext Hit without any extra resources in cost effective manner in the following phases:

i) Previous HitPhaseNext Hit I: 2D Previous HitseismicNext Hit survey was initially carried out. The lines were short and hence, data was acquired keeping all the receivers live for ever shot. This generated high fold data required for obtaining interpretable data. Additionally, two 2D lines were shot simultaneously, generating extra coverage between the lines. This 2D survey resulted in the discovery of an oil & gas field.
ii) Previous HitPhaseNext Hit II : The area was then covered with 3D Previous HitseismicNext Hit survey. At the north, towards the national park, receiver line spacing was reduced so that foldage develops within a short distance.
iii) Previous HitPhaseNext Hit III: Next Previous HitphaseNext Hit is aimed at coverage of the data gap due to the swamp and providing continuous imaging at prospect level. A Close-Grid 2D Survey of 400 m line was designed with high channel count split-spread geometry having adequate shots and receivers placed on both side of the swamp with innovative CDP coverage-Offset compensation technique.

The Previous HitseismicTop data gap is thus covered which is essential for exploration of a remote oil field.

Presentation GEO India Expo XXI, Noida, New Delhi, India 2008©AAPG Search and Discovery