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Challenging task of gas hydrate exploration: Indian scenario

Dr. A.K. Jain
Oil & Natural Gas Corporation Ltd., India

 

  The discovery of large gas hydrate accumulations in arctic permafrost and beneath the sea along the continental margins of the world ocean is estimated at about 20,000 trillion m3. The figure is astounding and scientists searching for a cleaner energy source have jumped the bandwagon of exploration and exploitation of this gigantic albeit sleeping resource. Recently several countries including Japan, India, United States, Canada and China have launched national projects. In India, a National gas hydrate program was launched in 1997 by ministry of petroleum and natural gas with participation of all national oil/gas exploration companies. Gas hydrate occurs here in deep water. Based on processing of 2D and 3D seismic data and geological consideration, about 1400 sq. km. area has been delineated as potential gas hydrate prone. Krishna-Godavari and Andaman offshore areas have got clear indication of BSR. Therefore initially Krishna-Godavari has been identified as a model field laboratory for further efforts up to the stage of pilot production testing of gas hydrates. Seismic, Side Scan Sonar, Sparker, AVO studies have been carried out. Various geochemical proxy indicator studies on shallow cores viz. TOC, absorbed gas, carbon isotope analysis, pore water chemistry and microbiological studies of indicator microbes like methanogens, methanotrophs, sulfate reducers and denitrifiers are being carried out for prioritization of locations. The coring through gas hydrate will lead to exact resource estimations.

 


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