|Application of CrunchFlow Routines to Constrain Present and Past Carbon Fluxes at Gas-Hydrate Bearing Sites||Last Reviewed 6/5/2013|
The goal of this project is to apply a multi-component, multi-dimensional reactive transport simulation code to constrain modern day methane fluxes and to reconstruct past episodes of methane flux that can be correlated with environmental changes.
Oregon State University ? Corvallis, OR
The importance of understanding the role that gas hydrates play in the global carbon cycle and in understanding their potential as a future energy resource have long been recognized and are key components of the Methane Hydrate R&D Program. Fundamental questions remain, however, as to the residence time of gas hydrates near the seafloor and deeper within the sediment column, the sources and pathways of methane transport, nature and driving mechanisms for flow, and changes in these variables over time.
In order to better understand these fundamental dynamics of methane in present and past environments, Oregon State University will model the complex nature of these interactions by adapting a comprehensive kinetic transport-reaction model based on the CrunchFlow code (Steefel, 2009) to simulate the processes occurring in the sediment column (diagenesis, sediment burial, fluid advection, and multi-component diffusion) and estimate net seafloor fluxes of solutes. CrunchFlow is a software package for modeling and simulation of reactive flow and transport through porous media including groundwater aquifers, soils, sediments, and crystalline rocks. The software can be used to simulate a range of important processes and environments, including reactive contaminant transport, chemical weathering, carbon sequestration, biogeochemical cycling, and water-rock interaction. CrunchFlow is available as a free download at http://www.csteefel.com/DownloadCrunchflow.html [external site] . The user's manual for CrunchFlow is available below under "Additional Information".
Development of a set of user-friendly CrunchFlow-based geochemical modules, tested and implemented using readily available field data (e.g., Cascadia, India, Ulleung Basin), will result in a more complete set of proxies to reconstruct changes in methane flux over time. A coherent set of simulation tools can be used in an integrated approach for future field projects such as those being proposed for the Arctic margin and other high methane flux sites and climate sensitive gas hydrate-bearing regions worldwide.
A complete kinetic model which describes the biogeochemical cycling around the sulfate-methane-transition-zone (SMTZ) has been formulated. The model accounts for changes in the concentration and isotopic profiles of various dissolved and solid species. A preliminary version of this model has been tested with biogeochemical data collected from the K-G basin in India.
Current Status (June 2013)
Verification of the kinetic model with field data from different regions (e.g. Ulleung Basin in East Sea) and sensitivity tests on several environmental factors are in progress.
Project Start: October 1, 2012
Project End: September 30, 2013
Project Cost Information:
DOE Contribution: $88,537
Performer Contribution: $28,831
NETL ? Robert Vagnetti (Robert.Vagnetti@netl.doe.gov or 304-285-1334)
Oregon State University ? Marta E. Torres (email@example.com or 541-737-2902)
Research Performance Progress Report [PDF-1.15MB] July - September, 2013
Research Performance Progress Report [PDF-370KB] April - June, 2013
Research Performance Progress Report [PDF-143KB] January - March, 2013
CrunchFlow User's Manual [PDF-446KB]