Gas hydrate stability zone modeling in the Krishna Godavari Basin, Eastern margin of India
نویسنده
چکیده
The Krishna Godavari (KG) basin is rich in gas hydrate and exhibits an area of wide range of gas hydrate stability zone (GHSZ). In this region, we modeled the base of the gas hydrate stability zone (BGHSZ) utilizing in situ temperature measurements acquired during national gas hydrate program (NGHP) Expedition-01. The bottom simulation reflector (BSR) closely approximates the BGHSZ, and due to the strong temperature influence on hydrate stability, the BSR is close to an isotherm. Thus BSR depth variations can be an indicator for local variations in heat flow, which in turn can be the result of fluid flow or faulting. We are trying to understand the linkage between fluid-flow and vertical fault system in the KG basin. Fluid flow showed a relation to fault systems where some of them are directly connected to gas hydrate bearing sedimentary formations. The influence of water bottom temperature, pore water salinity and geothermal gradient variation on GHSZ thickness is critically analyzed in relation to both geological formations and tectonics. Our analysis suggests a highly variable GHSZ in the KG basin controlled by local variations in the parameters of stability conditions. Recovery of gashydrate sample from the region and presence of gas hydrate above estimated BSR depths may indicate gas-hydrate in thermal equilibrium.
منابع مشابه
Physical Properties of Repressurized Samples Recovered during the 2006 National Gas Hydrate Program Expedition Offshore India
As part of an international cooperative research program, the U.S. Geological Survey (USGS) and researchers from the National Gas Hydrate Program (NGHP) of India are studying the physical properties of sediment recovered during the NGHP-01 cruise conducted offshore India during 2006. Here we report on index property, acoustic velocity, and triaxial shear test results for samples recovered from ...
متن کاملHydrogeochemical and Structural Controls on Heterogeneous Gas Hydrate Distribution in the K-g Basin Offshore Se India
Natural gas hydrates occur on most continental margins in organic-rich sediments at water depths >450 m (in polar regions >150 m). Gas hydrate distribution and abundance, however, varies significantly from margin to margin and with tectonic environment. The National Gas Hydrate Program (NGHP) Expedition 01 cored 10 sites in the Krishna-Godawari (K-G) basin, located on the southeastern passive m...
متن کاملDraft Genome Sequence of Rhodococcus rhodochrous Strain KG-21, a Soil Isolate from Oil Fields of Krishna-Godavari Basin, India
Here, we present the 6.1-Mb draft genome sequence of Rhodococcus rhodochrous strain KG-21, a soil isolate from the oil fields of Krishna-Godavari Basin in Andhra Pradesh, India. This genomic resource may help in the identification of the gene(s) involved in hydrocarbon degradation and their possible deployment for bioremediation.
متن کاملGas Hydrates in Three Indian Ocean Regions, a Comparative Study of Occurrence and Subsurface Hydrology
To establish the structural and lithological controls on gas hydrate distribution and to assess the potential energy resource and environmental hazards in the Indian Ocean, non-pressurized and pressurized cores were recovered from the Krishna-Godavari (K-G) and Mahanadi Basins offshore east India, and from an Andaman Sea site. The pore fluids were analyzed for: salinity, Cl, sulfate, sulfide, c...
متن کاملDraft Genome Sequence of Hydrocarbon-Degrading Pseudomonas putida Strain KG-4, Isolated from Soil Samples Collected from Krishna-Godavari Basin in India
We report here the 5.58-Mb draft genome of Pseudomonas putida strain KG-4 obtained from the oil fields of the Krishna-Godavari basin, Andhra Pradesh, India. The genome sequence is expected to facilitate identification and understanding of genes associated with hydrocarbon metabolism, which can help in developing strategies for managing oil spills and bioremediation.
متن کامل