Evidence of slumping/sliding in Krishna–Godavari offshore basin due to gas/fluid movements

Ramprasad, T.; Dewangan, P.; Ramana, M.V.; Mazumdar, Aninda; Karisiddaiah, S. M.; Ramya, E.R.; Sriram, G.

doi:10.1016/j.marpetgeo.2011.02.007

Cited by 61 publications

(37 citation statements)

References 22 publications

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“…Using 14 C dating, Ramprasad et al (2011) estimated the sediment deposition rate in one MTD to be 40 m/kyr, which is much faster than the sedimentation rate for the other hemipelagic sequence in their study (2.1m/kyr). 14 C dating from Mazumdar et al (2012) also revealed a dramatic change in sedimentation rate between two deposition modes (i.e., hemipelagic sediment rain vs. MTDs).…”

Section: Model-estimated Mtd Magnitude and Agementioning

confidence: 79%

“…The delta fronts exhibit MDTs, scars and irregular topography over the modern upper continental slope formed by sliding/slumping Ramana et al, 2009;Ramprasad et al, 2011).…”

Section: Study Regionmentioning

confidence: 99%

“…Recent seismic and bathymetric surveys in this area imaged widespread MTDs Forsberg et al, 2007;Shanmugam et al, 2009;Ramprasad et al, 2011), and were used to guide drilling during the NGHP-01 expedition in 2006.…”

Section: Study Regionmentioning

confidence: 99%

“…The Krishna-Godavari (K-G) Basin on the eastern Indian margin is characterized by extensive mass-transport deposits (MTDs) formed by sliding/slumping of river-delivered sediments Ramana et al, 2009: Shanmugam et al, 2009Ramprasad et al, 2011). MTDs in the K-G Basin may be related to variations in regional climate and changes in sediment discharge from the Krishna and Godavari rivers Ramana et al, 2009;Ramprasad et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…MTDs in the K-G Basin may be related to variations in regional climate and changes in sediment discharge from the Krishna and Godavari rivers Ramana et al, 2009;Ramprasad et al, 2011). However, the regional variability, magnitude, and age of the individual events are poorly constrained.…”

Section: Introductionmentioning

confidence: 99%

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Application of Crunch-Flow Routines to Constrain Present and Past Carbon Fluxes at Gas-Hydrate Bearing Sites

Torres

2014

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In November 2012, Oregon State University initiated the project entitled: Application of Crunch-Flow routines to constrain present and past carbon fluxes at gas-hydrate bearing sites. Within this project we developed Crunch-Flow based modeling modules that include important biogeochemical processes that need to be considered in gas hydrate environments. Our modules were applied to quantify carbon cycling in present and past systems, using data collected during several DOE-supported drilling expeditions, which include the Cascadia margin in US, Ulleung Basin in South Korea, and several sites drilled offshore India on the Bay of Bengal and Andaman Sea. Specifically, we completed modeling efforts that: 1) Reproduce the compositional and isotopic profiles observed at the eight drilled sites in the Ulleung Basin that constrain and contrast the carbon cycling pathways at chimney (high methane flux) and non-chimney sites (low methane, advective systems); 2) Simulate the Ba record in the sediments to quantify the past dynamics of methane flux in the southern Hydrate Ridge, Cascadia margin; and 3) Provide quantitative estimates of the thickness of individual mass transport deposits (MTDs), time elapsed after the MTD event, rate of sulfate reduction in the MTD, and time required to reach a new steady state at several sites drilled in the Krishna-Godavari (K-G) Basin off India. In addition we developed a hybrid model scheme by coupling a home-made MATLAB code with CrunchFlow to address the methane transport and chloride enrichment at the Ulleung Basins chimney sites, and contributed the modeling component to a study focusing on pore-scale controls on gas hydrate distribution in sediments from the Andaman Sea. These efforts resulted in two manuscripts currently under review, and contributed the modeling component of another pare, also under review. Lessons learned from these efforts are the basis of a mini-workshop to be held at Oregon State University (Feb 2014) to instruct graduate students (OSU and UW) as well as DOE staff from the NETL lab in Albany on the use of Crunch Flow for geochemical applications.iii routines to constrain present and past carbon fluxes at gas-hydrate bearing sites, we developed Crunch-Flow based modules to simulate important biogeochemical processes that need to be considered in gas hydrate environments. Kinetic model nodules were developed to: 1) Fully characterize the methane cycling at the sulfate-methane transition zone in systems in both diffusive and advective (chimney sites) flux regimes; 2) Reconstruct paleo-methane fluxes; and 3) Quantify the effect of sediment slumping on pore water profiles. We show the applicability of these modules by contributing to an additional study led by Kelly Rose, on pore-scale effects of gas hydrate distribution in the Andaman Sea.Our efforts within the scope of this project have allowed us to better quantify the reactions involved in generation and cycling or methane in present day system, both those controlled by purely diffusive fluxes as well as ...

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Section: Model-estimated Mtd Magnitude and Agementioning

confidence: 79%

“…The delta fronts exhibit MDTs, scars and irregular topography over the modern upper continental slope formed by sliding/slumping Ramana et al, 2009;Ramprasad et al, 2011).…”

Section: Study Regionmentioning

confidence: 99%

Section: Study Regionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Application of Crunch-Flow Routines to Constrain Present and Past Carbon Fluxes at Gas-Hydrate Bearing Sites

Torres

2014

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Controls on evolution of gas‐hydrate system in the Krishna‐Godavari basin, offshore India

Badesab

Dewangan

Usapkar

et al. 2017

Geochem Geophys Geosyst

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In this study, we integrate environmental magnetic, sedimentological, and geochemical records of sediment core of Hole NGHP-01-10D overlying methane hydrate deposits to decipher the controls on the evolution of fracture-filled gas-hydrate system in the Krishna-Godavari (K-G) basin. Four distinct sedimentary units have been identified, based on the sediment magnetic signatures. An anomalous zone of enhanced magnetic susceptibility (Unit III: 51.9-160.4 mbsf) coinciding with the gas hydrate bearing intervals is due to the presence of magnetite-rich detrital minerals brought-in by the river systems as a result of higher sedimentation events in K-G basin and has no influence over hydrate formation. A strong to moderate correlation between magnetite concentration and chromium reducible sulfur (CRS) content indicates significant influence of sulfidization on the magnetic record and could be further exploited as a proxy to decipher paleo-H 2 S seepage events. Analysis of high-resolution seismic, bathymetry, and subbottom profiler data reveals the existence of a regional fault system in K-G basin. The opening and closing dynamics of the faults facilitated the migration and trapping of required gas concentrations resulting in accumulation of gas hydrates at the studied site. The seismic data provides support to the rock-magnetic interpretations. The observed variations in magnetic and geochemical properties have resulted from the episodic flow of methane and sulfide-enriched fluids through the fracture-filled network formed as a result of shale-tectonism. Our study demonstrated the potential of using an enviro-magnetic approach in combination with other proxies to constrain the evolution of gas-hydrate system in marine environments. Key Points:Magnetic signatures of detrital and diagenetic processes associated with evolution of gas-hydrate system. Changes in magnetic and geochemical properties controlled by underlying gas-hydrates. Magnetic proxy to decipher paleo-H2S seepage events in marine sediments.

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A Review of the Exploration, Discovery and Characterization of Highly Concentrated Gas Hydrate Accumulations in Coarse-Grained Reservoir Systems Along the Eastern Continental Margin of India

Collett

Chopra²,

Bhardwaj³

et al. 2022

World Atlas of Submarine Gas Hydrates in Continental Margins

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Evidence of slumping/sliding in Krishna–Godavari offshore basin due to gas/fluid movements

Cited by 61 publications

References 22 publications

Application of Crunch-Flow Routines to Constrain Present and Past Carbon Fluxes at Gas-Hydrate Bearing Sites

Application of Crunch-Flow Routines to Constrain Present and Past Carbon Fluxes at Gas-Hydrate Bearing Sites

Controls on evolution of gas‐hydrate system in the Krishna‐Godavari basin, offshore India

A Review of the Exploration, Discovery and Characterization of Highly Concentrated Gas Hydrate Accumulations in Coarse-Grained Reservoir Systems Along the Eastern Continental Margin of India

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