Electromagnetic Imaging (EMI) Representative Project Summaries

Transcription

1 Electromagnetic Imaging (EMI) Representative Project Summaries A Cost-Effective Tool for Site Characterization Marcellus Shale Water Group, LLC State College, PA Houston, TX Austin, TX Scanning the brain, or scanning the terrain The brain: we leave that to the doctors. The terrain: well, that s what we do. 1

2 What does EMI do? Only one thing it detects subsurface anomalies! Identification of Subsurface Anomalies Pipelines and wellheads Buried drums, tanks, and debris Landfill and trench boundaries Subsurface voids Salinity, salt water impacts Hydrocarbon accumulation DNAPL and LNAPL accumulation Aquifer permeability pathways 2

3 Electromagnetic Imaging The Quick, Easy Way to Gather Subsurface Information Without Intrusive Sampling! Combined state-of-the-art EMI GPS hardware and software package Multi-depth profiling of site down to 100 feet bgs in 16 depth increments Real-time data collection and download in the field for quick decisions Color field mapping of anomalies based on assessment parameters Sub-meter accuracy in the X and Y planes for accurate demarcation Automated EMI GPS system does not require manual layout of grids No intrusive sampling or disturbance of property, or waste generation Reduced site characterization costs Portable system can be hand carried or mounted to sled or boat More cost-effective than other screening technologies There are two methods of gathering EMI data: Conventional Method Set up a grid of entire site Manually record EMI measurements at each node Take the data back to the office Analyze the data back in the office Generate a map in the office MSWG Method Generate a map in the field in real-time! 3

4 Random Site Coverage: MSWG can randomly collect subsurface data using a unique This image cannot currently be displayed. combination of EMI geophysical sensors, GPS capability, and special mapping software Technology Success Rate More than 300 projects Open rural environments: ~95% Cluttered / urban environments: ~50% 4

5 This image cannot currently be displayed. Example Project: Detection of Oil Pipeline Leak This project consisted of using EMI, followed by confirmatory intrusive sampling, to detect and demarcate the extent of contamination resulting from the rupture of a subsurface crude oil pipeline in West Texas. Since this was a very large surface area, the use of EMI greatly facilitated the characterization process. Confirmatory sampling indicated a correlation of EMI data with analytical testing data of greater than 95%. In the site map below, the dark blue / purple areas represent free phase hydrocarbon accumulation, while the light blue areas represent moderate contamination, and the green and yellow areas represent non-contaminated areas Northing(m) Easting (m) 5

6 This image cannot currently be displayed. Example Project: Location of Buried Abandoned Oil Pits This image cannot currently be displayed. This project consisted of using EMI, followed by confirmatory intrusive sampling using the Geoprobe, to detect and demarcate abandoned oil field pits that were used during the early 1900s near Humble, Texas. Approximately 50 acres were mapped, in real time, and from 1 to 7 meters bgs, in about three days. Confirmatory sampling indicated a correlation of EMI data with analytical testing data of greater than 95%. In the site map below, the darker blue areas represent hydrocarbon accumulation in the subsurface pits, the lighter blue and green areas represent minimal contamination, and the red represents buried metal drums and debris. The Site Example Project: Determination of Source of Release of Hydrocarbons This project consisted of using EMI to determine the source of crude oil contamination at an oil field property in New Mexico with a history of no known releases. Using EMI, a large area was surveyed at multiple frequencies / depths. Pockets of hydrocarbon accumulation in underlying calcareous sandstone nodules were detected at about 60 feet bgs. The pockets were traced back to an adjacent oil field operation approximately 800 meters upgradient of the site, the source of the release. The Site 6

7 This image cannot currently be displayed. Edgeof Grass Example Project: Location of Buried Saltwater Pipeline Leak This project consisted of using EMI to detect and demarcate the extent of contamination resulting from the rupture of a subsurface saltwater pipeline in a very sensitive brackish ecosystem in Louisiana. The pipeline corridor was about 5000 meters long and 300 meters wide. Since this was a very large surface area, the use of EMI greatly facilitated the characterization process. The entire project required only three days one day to mount the EMI on an air boat, one day to map the site, and one day to demob. In the site map below, the red and pink areas represent high conductivity anomalies, indicative of salinity releases from the pipeline. The blue areas represent brackish water. The Site Example Project: Investigation of Salinity Impact This project consisted of using EMI to detect and demarcate the extent of contamination resulting from the rupture of a subsurface saltwater pipeline onto private property in Texas. The surface features of the site indicated vegetative disruptions. EMI was used to locate points of release from the pipeline. In the site map below, the red and pink areas represent high conductivity anomalies, indicative of salinity releases from the pipeline. The green and blue are background. P ip eline R ight of Way Kochia Edgeof Grass Road A ccess 7

8 Example Project: Investigation of UXO Impact This project consisted of using EMI to detect and demarcate the extent of contamination resulting from the release of nitrates associated with UXO. In the site map below, the red and pink areas represent high conductivity anomalies, indicative of UXO, with a clear indication of source and gradient. The green and blue are background conditions. Example Project: Investigation of Salt Water Impact This project consisted of using EMI to detect and demarcate the extent of contamination resulting from a salt water breakout onto private property in northwest Texas. EMI was used to locate potential sources and the direction of flow of the contamination. In the site map below, the red and pink areas represent high conductivity anomalies, indicative of salinity releases. The green and blue areas represent background conductivity levels Northing(m) Easting (m) 8

9 Example Project: Investigation of Abandoned Creosote Facility This project consisted of using EMI to detect anomalies associated with releases by an abandoned creosote facility in a Florida swamp. EMI was used to locate potential DNAPL. Conventional drilling confirmed high levels of PAHs in the subsurface. The red and pink areas represent highly conductive areas, possibly associated with DNAPL. The green and blue areas represent background conductivity levels. Northing (m) Easting (m) Additional Photographs 9

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12 Oil Field Site Oil Pipeline Leak This image cannot currently be display ed Northing (m) Easting (m) 12

13 This image cannot currently be displayed. This image cannot currently be displayed. Oil Field Site Oil Field Site 13

14 This image cannot currently be displayed. This image cannot currently be displayed. Saltwater Pipeline Leak Site Saltwater Pipeline Leak Site 14

15 UXO (Ammonium Nitrate) Site Location of UST Along Roadway 15

16 Power Line DNAPL at Creosote Site Northing (m) Easting (m) Well Well 16

17 Bare Area Pipeline Right of Way Kochia Edge of Grass Edge of Grass Access Road 17

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19 Access Road Power Line Slough Tank Culvert Lease Boundary 19

20 Contact Information Randy D. Horsak, PE (281) Dr. Gary L. Sorensen (814) Marcellus Shale Water Group, LLC Warriors Mark, Pennsylvania Houston, Texas Austin, Texas 20