Presented by: Brad Cross, ERM October, 2018

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Presentation transcript:

Presented by: Brad Cross, ERM October, 2018 Nuclear Magnetic Resonance Geophysical Investigations How to Quantify Aquifer Properties and Hydrocarbon Saturation Using Existing Monitoring Wells Presented by: Brad Cross, ERM October, 2018

Goal: Closure of Contaminated Sites Problem: Heterogenaity vs Simplyfing Assumptions Solution: Resolve & understand the true aquifer fabric and multi-domain mass flux, mass storage systems HRSC Tools EC CPT Televiewers (acoustic/optic) Heat-Pulse Flow Meter HPT MIP LIF Traditional Borehole Geophysics

NMR builds on other HRSC tools: Total porosity (no equivalent push-tool method) Mobile & immobile pore volumes and pore size distribution (no equivalent push-tool method) Hydraulic conductivity Hydrocarbon (LNAPL) detection Can be Acquired in Existing PVC-cased Wells Figure Courtesy of VistaClara, Inc.

Some Potential Applications: High resolution conceptual site model development: Perched water identification/residual (irreducible) water saturation Aquifer mass flux and mass storage zones Pore volume and pore size distribution characterization Mass flux estimation Quantification of changes in properties over time: Infiltration, dewatering, residual saturation Pore-space reduction (biofouling, subsidence) Hydrocarbon (LNAPL) saturation reduction Water supply/extraction well design/efficiency: Optimize screen intervals Assess redevelopment/rehabilitation

NMR Measurement Physics Properties of fluids that effect echo trains: hydrogen index (HI) longitudinal relaxation time (T1) transverse relaxation time (T2) diffusivity (D, the extent to which molecules move at random in the fluid). T2 decay is proportional to pore size. Porosity and pore size can be used to estimate permeability and the free fluid index (moveable fluids) Figure Courtesy of VistaClara, Inc.

Hydrologic Properties from NMR MRI directly measures the density of hydrogen nuclei in fluids Since density of hydrogen nuclei in water is known, data can be directly converted to an apparent water-filled porosity Can also determine the presence and quantities of different fluids Figure Courtesy of VistaClara, Inc.

Relaxation rates strongly correlate with pore size T2 relaxation time increases with pore size Figure Courtesy of VistaClara, Inc.

Mobile versus Immobile Porosity Using inverse modeling, composite echo trains are converted to porosity distributions. Modeling is based on substantial laboratory calibrations to various soil/rock matrices Irreducible & Clay Bound Fluid Mobile Fluid T2 cutoff Title of Presentation (Insert > Header & Footer to edit)

Hydrologic Properties from NMR Figure Courtesy of VistaClara, Inc.

Multi-Phase Porosity Distribution Figure modified from Coates, Xiao, & Prammer; Halliburton Energy Services Publication H02308

Downhole NMR Logging Used in oil & gas for decades Oil field tools Porosity, saturation, permeability Fluid-type oil/water (based on diffusion) Oil field tools Operated by oil services companies Engineered for deep logging: high-P, high-T Very large: > 50 ft long & 5.75” diameter Very expensive: single well >$50,000 Figure Courtesy of VistaClara, Inc.

Downhole NMR Logging Figure Courtesy of VistaClara, Inc.

Downhole NMR Logging Figure Courtesy of VistaClara, Inc.

Javelin System (VistaClara, Inc.)

Javelin System (VistaClara, Inc.) Can be deployed with Geoprobe Systems® equipment (direct-push tool) From Spurlin, Barker, Cross, & Divine

Straightforward Interpretation Vertical resolution determined by length of coil in probe and pore size distribution Processing automated in packaged software Interpretation yields detailed characterization of aquifer structure and properties (bound/mobile water content, permeability) Figure Courtesy of VistaClara, Inc.

Case Study: Mill Tailings Figure modified from Spurlin, Barker, Cross, & Divine

Mill Tailings Impoundment Figure modified from Spurlin, Barker, Cross, & Divine

Hydrocarbon Detection Pilot Test Results Figure modified from Spurlin, Barker, Cross, & Divine

Surface NMR Figure Courtesy of VistaClara, Inc.

Comparison of Logging and Surface NMR Figure Courtesy of VistaClara, Inc.

Summary NMR is a viable technology for environmental and water supply practitioners Cost savings and reduced risk to human health and safety Improved site characterization and CSM refinement Strong potential to optimize remedial designs

Thank you Brad Cross Partner: Pacific West brad.cross@erm.com +01 480 869 0604 Scottsdale, Arizona