Fracking Industry Shakes Up Northern BC with 231 Tremors

Fracking field in north eastern BC.   Photo: The Tyee.

Fracking field in north eastern BC. Photo: The Tyee.

Quakes also triggered by wastewater disposal, finds oil and gas commission.

By Andrew Nikiforuk, TheTyee.ca, Jan 10, 2015

British Columbia’s shale gas fracking industry triggered more than 231 earthquakes or ”seismic events” in northeastern British Columbia between Aug. 2013 and Oct. 2014.

Some of the quakes were severe enough to ”experience a few seconds of shaking” on the ground in seven areas of the province on top of the large Montney shale gas basin.

The events, many of which occurred in clusters or swarms, showed that the regulation of the industry still lags behind the pace of drilling activity in the region.

”Induced seismicity related to wastewater disposal and hydraulic fracturing within the Montney (a 29,850 square-kilometre underground siltstone formation) indicates a more uniform application of regulations is appropriate,” concluded a December report by the BC Oil and Gas Commission.

The 32-page report states that 38 tremors were caused by the injection of wastewater produced by fracking operations and another 193 events were directly attributed to the hydraulic fracturing of hundreds of horizontal wells in the region.

Green circles indicate areas with hydraulic fracturing induced seismic events. Credit: BC Oil and Gas Commission.  Graphic: The Tyee.

Green circles indicate areas with hydraulic fracturing induced seismic events. Credit: BC Oil and Gas Commission. Graphic: The Tyee.

Hydraulic fracturing is a technology that pumps slurries of water, sand and chemicals at high pressure to crack shale rock as deep as 2,500 metres. Industry models can’t always predict how the rock will crack or where the cracks will travel.

The Commission says that none of the recorded events resulted in well damage and that ”ground motions recorded to date are below the damage threshold.” Yet many of the tremors shook the ground under well sites near Fort St. John and Dawson Creek.

The report appears to contradict its own finding, however, by noting that ”several instances of casing deformation have occurred with the horizontal portion of shale gas wellbores.”

More swarms abroad

Other scientific reports and studies released this month have implicated hydraulic fracturing or the injection of fracking wastes with earthquake swarms in Ohio and Texas.

Since 2008, the U.S. Geological Survey has reported nearly 100 tremors near Irving, Texas, another landscape as highly fractured as northern B.C.

Before oil and gas development, ”a swarm of earthquakes like this would be fairly uncommon,” John Bellini, a geophysicist at the USGS, told the Guardian this week. ”In the last few years we have seen several swarms of earthquakes in various parts of Texas.”

A new study published by the Bulletin of the Seismological Society of America also links hydraulic fracturing with earthquake swarms outside of Youngstown, Ohio.

That state has now established buffer zones around high-risk areas, while other states such as Colorado have set up a traffic light system for industry-caused earthquakes. A tremor of 4.5 magnitude serves as a red light to further fracking.

Horizontal or slanted wells have a long history of becoming problematic gas leakers due to their complexity and poor cement seals.

Injection of waste fluids a culprit

The BC Oil and Gas Commission report found that the injection of waste fluids (more than five million cubic metres of contaminated waste water a year) into 104 disposal wells in B.C. triggered small earthquakes ranging from 1.2 to 2.9 magnitude, while the highly pressurized frack operations triggered earthquakes ranging from one to 4.4 magnitude.

Any company that now triggers a 4.0 magnitude earthquake in B.C. must immediately shut down its operations. In addition, all felt events on the ground must be reported to the regulator.

Annual water disposal volumes for northeast B.C. Credit: BC Oil and Gas Commission.

Annual water disposal volumes for northeast B.C. Credit: BC Oil and Gas Commission.

The mechanism responsible for the earthquakes was the same whether industry injected short bursts of frack fluids under high pressure or large volumes of waste water over long periods of time: both practices reactivated subterranean faults or fractures, setting off swarms of tremors.

According to the report, more than 450 wells are drilled into the Montney formation every year and each wellbore requires up to 14 different hydraulic fractures.

Each fracking stage uses between 700 and 3,500 cubic metres of water. About half of that water ends up in a waste stream that industry then injects into the ground, triggering more tremors. On average, the province’s fracking industry uses three more times more water than its peers in Texas or Pennsylvania.

In 2012, that amounted to more than seven billion litres of water drawn from hundreds of streams, rivers, lakes, dams, municipal waterworks and aquifers.

To date, the province’s fracking industry has tried to reduce frack volumes or injection pumping rates, but ”the success of these mitigation procedures is difficult to ascertain given the many hydraulic fracture operational parameters at play and the anecdotal nature of the results,” states the report.

The commission adds that it must increase scrutiny for wastewater disposal wells so that pre-existing faults are identified before the industry sets off swarms of earthquakes.

Since 2005, the number of wastewater injection wells has increased from 89 to 104 in northern B.C. to accommodate all the contaminated water produced by fracking. Disposal volumes increased 60 per cent over the same period. Studies have shown that injection wells tend to leak more than producing wells.

Research on the effects and relationships between industry made earthquakes and hydraulic fracturing and water disposal is ongoing at the University of British Columbia and Geoscience BC.

http://thetyee.ca/News/2015/01/10/Fracking_Industry_Shakes_Up_Northern_BC/

Posted on January 10, 2015, in Oil & Gas and tagged , , , . Bookmark the permalink. 9 Comments.

  1. Reblogged this on In Frog Pond Holler and commented:
    Add B.C. to the areas reporting increased numbers of earthquakes related to fracking. 😦

  2. Not only are the. Arib country’s causing Alberta and B.C to loose money with the price of a barrel of oil to be so low they are sitting back watching us destroy our land with this tracking. In the end they will laugh at us as they are charging us higher prices to by their oil and tryingto rrebuild our land. This is the best way to cause us terror.

    • Actually the low price of oil is scaling back some of the fracking industry projects because it is no longer profitable to extract oil when it’s so low in price (although I don’t know how much impact oil prices have on fracked gas). And right now the Saudis are not charging higher prices, the price is largely determined by production levels, and the Saudis have decided to not cut back on their production so there is a glut of oil in the global supply. This is what leads to lower prices for oil, and the impact of this is to make oil production in more “developed countries” such as Russia and the US no longer profitable since it costs more to produce.

  3. I think this is all coincidental and I believe you guys are grasping at straws. What about all the areas that have quakes? I bet lots of them have no Gas and oil activity in the vicinity Why don’t you report those stories??

    • Earthquakes are obviously natural occurrences, and no one is saying that anytime there’s an earthquake it’s a result of fracking. What this report states is that in areas where there has been substantial fracking there has been a corresponding increase in seismic activity. Now why would we report on “all the areas that have quakes”?

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