PALEO HYDRATE AND ITS ROLE IN DEEP WATER PLIO-PLEISTOCENE GAS RESERVOIRS IN KRISHNA-GODAVARI BASIN, INDIA ...

• Main Authors: Kundu, Nishikanta, Pal, Nabarun, Sinha, Neeraj, Budhiraja, IL
• Format: Text
• Language: English
• Published: The University of British Columbia 2016
• Subjects: Methane hydrate
• Online Access: https://dx.doi.org/10.14288/1.0040940; https://doi.library.ubc.ca/10.14288/1.0040940

Discovery of natural methane hydrate in deepwater sediments in the east-coast of India have generated significant interest in recent times. This work puts forward a possible relationship of multi-TCF gas accumulation through destabilization of paleo-hydrate in Plio-Pleistocene deepwater channel sands of Krishna-Godavari basin, India. Analysis of gas in the study area establishes its biogenic nature, accumulation of which is difficult to explain using the elements of conventional petroleum system. Gas generated in sediments by methanogenesis is mostly lost to the environment, can however be retained as hydrate under suitable conditions. Longer the time a layer stayed within the gas hydrate stability zone (GHSZ) greater is the chance of retaining the gas which can be later released by change in P-T conditions due to sediment burial. P-T history for selected stratigraphic units from each well is extracted using 1-D burial history model and analyzed. Hydrate stability curves for individual units through time are ...