Today’s post is by guest blogger Jim Sheehan, a GIS and remote-sensing specialist and PhD student at West Virginia University.
Many of you are likely aware of the huge push to drill the Marcellus Shale for its abundant natural gas. You may have seen it for yourself, or been exposed to the many advertisements on TV, radio, and in print. Development of this new, unconventional source of energy, underlying a large expanse of the eastern US (Fig. 1), has exploded just in the past few years.
|Fig. 1. The red line shows the Marcellus Shale extent (drawn from USGS report) and the black line represents the wet-dry gas boundary (drawn from Penn State Marcellus Center for Outreach and Research map). Wetzel County is the filled green shape.|
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|A new ridge top Marcellus drill pad in Wetzel Co. in a formerly forested lot. The drilling has ceased for the moment as the well apparently is being vented (photo: Jim Sheehan).|
With the help of SkyTruth, who kindly provided me some blog space and encouragement, here I explore the recent development of Marcellus (and other unconventional drilling) in Wetzel Co. To show the increase in drilling I used well information and geographic coordinates for 102 completed unconventional wells in Wetzel Co. from 2007-2011 that I obtained from the West Virginia Geological & Economic Survey’s “Pipeline-Plus” database.
Next, I zoom in to Wetzel Co. (Fig. 2) for greater on-the-ground detail. The 102 wells actually occur on about 50 separate pads, since multiple directional wells can be drilled per pad. A great feature of Google Earth is that you can view current and historical aerial and satellite images to explore change through time. Particularly valuable to me are the 2011 (current), 2009, and 2007 leaf-on aerial photographs from the National Agriculture Imagery Program (NAIP). Using the sequence of these images, I often see in great detail the land cover prior to preparation and drilling of the well site, characteristics of the well pad and the activity, and any associated infrastructure development (roads, pipelines, and holding ponds).
|Fig. 2. Wetzel Co. and 2007-11 well locations (red = Marcellus, pink = other Devonian Period formations), and proposed/in progress wells 2011-present (as of September, 2012; dark gray dots). Also shown are the Lewis Wetzel Wildlife Management Area (green outline) and two of its forested headwater streams (light blue), and the Fishing Creek streams (dark blue) that flow into the Ohio River near New Martinsville, WV.|
|Fig. 3. A side view of Wyatt Run at the Lewis Wetzel WMA, with a new Marcellus pad, holding pond, and access road as of 2011. The pad (and a new 2012 pad not captured by the photo) has “slipped” due to the steep topography characteristic of the region.|
The side of the ridge top well pad visible in Fig. 3, and a new one I’ve marked that occurred after the 2011 NAIP aerial, have “slipped” substantially due to the steep, rather unstable terrain, and are causing heavily sedimentation in Wyatt Run. There are efforts to correct the problem, but unfortunately it appears to be difficult to stop the erosion. As of September 2012 the sedimentation continues, and there have even been substantial direct impacts to the stream itself. Clearly, better planning is needed during the siting of well pads to avoid situations like this, and the amount of activity, at least in this watershed, appears to be at odds with industry claims of a light environmental footprint.
|Left: a mudslide coming down from the 2012 Marcellus ridge top pad that has “slipped” above Wyatt Run. Right: a downstream pool of Wyatt Run continually polluted by the heavy sedimentation from the ridge top pads. (photos: Jim Sheehan)|
I’ll also use this location to illustrate another concern. With new pads comes much associated infrastructure that can fragment previously continuous forest, and potentially have a negative effect on wildlife that prefer large, undisturbed forest patches. While some wildlife may benefit, new roads and pipelines can also act as corridors – bringing in undesirable or exotic plants and animals. The drilling and site preparation also result in noise and air pollution. I can say first-hand that recreation (hunting, wildlife viewing, etc.) is much reduced in the formerly popular Lewis Wetzel Wildlife Management Area, and heavy vehicle traffic and the dust and potholes it brings seriously disturb the local community.
In closing, given the rapid increase in drilling between 2007-2011 and the amount of post-2011 proposed/in-progress wells I’ve begun to map (Fig. 2), it is clear that the impacts to the forests of Wetzel Co. can happen very quickly. The next NAIP aerial should happen in 2013, and provide a new, detailed snapshot of drilling-related activity. In the meantime, I wish to use what we can now see to increase awareness of environmental costs seldom heard about, and make them an important consideration in the development of this energy resource.
Jim Sheehan, October 7, 2012