--> Abstract: Development of a Hydrofacies Framework for Dual-Domain Transport Modeling, by Mary K. Harris, Margaret R. Millings, and Gregory P. Flach; #90078 (2008)

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Development of a Hydrofacies Framework for Dual-Domain Transport Modeling

Mary K. Harris, Margaret R. Millings, and Gregory P. Flach
Savannah River National Laboratory, Aiken, SC

Initial field characterization data will be presented for an Office of Science Department of Energy research project. The final objective of the study is improved dual-domain transport modeling predictions using multi-scale facies-based characterization parameters. Data collected to date has delineated facies through multi-scale field characterization data (cone penetration testing (CPT), rotosonic coring, gamma logs, water and soil headspace analysis, electromagnetic borehole flowmeter (EBF), slug tests, injection tests, and water level data). Surface and shallow geophysical techniques will be integrated with the overall facies framework for transport modeling. The study area is located in the upper Atlantic coastal plain of South Carolina consisting of interbedded and heterogeneous fluvial, deltaic, and shallow-marine sediments. The area also has a trichloroethylene (TCE) plume, with concentrations ranging from less than 100 ug/L to greater than 20,000 ug/L. Geophysical and hydrogeologic borehole-scale data were collected and analyzed from three new wells, piezometer installation and CPT. Three clay-rich horizons and three sand-rich horizons along with a very poorly sorted pebble-rich zone were defined. Hydrofacies were assigned using core-descriptions, sieve data, and EBF data. Water and soil headspace analysis provided contaminant concentrations. Lower concentrations of TCE were observed in the high permeability (K) facies and low K facies while higher concentrations appear in the moderate K facies and fringes of low K intervals. The data support a hydrofacies framework for transport modeling and suggest the plume center of mass has since passed the study area. Additional characterization data will be collected to refine the integrated hydrogeophysical model for the dual-domain TCE transport model based on the findings to date.

 

AAPG Search and Discovery Article #90078©2008 AAPG Annual Convention, San Antonio, Texas