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• W2902278241 abstract "Abstract This report presents the result of geochemical studies carried out on cores recovered from Krishna-Godavari Basin (K-G Basin) during the National Gas Hydrate Program Expedition 02 (NGHP-02). NGHP-02 targeted gas hydrate accumulations in sand facies in the K-G Basin off the east coast of the Indian Peninsula. Three areas (Area B, Area C and Area E) in the K-G Basin were investigated. During this expedition, 10 research sites in K-G basin were cored and samples for geochemistry analysis were collected. High TOC/TN ratios indicate an input from terrestrial organic matter. Analysis of gas samples from pressure cores also acquired during NGHP-02 were composed of mostly methane. Carbon Isotopic studies show that methane gas sampled from recovered gas hydrate samples were derived from biogenic (microbial) sources. This list of factors appears to indicate that the gas associated with the recovered hydrate-bearing core samples were derived from a microbial source. However, the biogeochemical processes responsible for generating the microbial gases found with the recovered gas hydrates may not have been limited to current limits off the gas hydrate stability zone. It is important to note here that microbial process likely extend to more than 1 km deep into the basin, so gas coming from below the GH stability zone can still be from a microbial source. In addition, the microbial gas within the stability zone was likely in part recycled from hydrate accumulations that has passed through the base of the gas hydrate stability zone as a product of sedimentation, with the dissociated microbial gas migration again vertically in the section, entering the gas hydrate stability zone and reforming gas hydrates. Although the organic carbon required for in situ methanogenesis and gas hydrate formation is abundant in the shallow sedimentary section of the KG-Basin, the faulted, fractured, and deformed stratigraphy observed in the KG- Basin coupled with high pore filling gas hydrate saturations at many sites, suggests that advective processes may be contributing to the supply of methane to the gas hydrates in the KG- Basin. The possible migration of gas from greater depths is also supported by seismic evidence of through-going migration-pathways that can connect the gas hydrate system with deeper petroleum systems. It is important to note here that the deep conventional gas accumulations in the basin also contain microbially sourced gas." @default.
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• W2902278241 date "2019-10-01" @default.
• W2902278241 modified "2023-10-12" @default.
• W2902278241 title "Origin of gas in gas hydrates as interpreted from geochemistry data obtained during the National Gas Hydrate Program Expedition 02, Krishna Godavari Basin, offshore India" @default.
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• W2902278241 doi "https://doi.org/10.1016/j.marpetgeo.2018.11.047" @default.
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