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Earthquakes in St. John was caused by fracturing: BC Oil and Gas Commission

B.C. & # 39; s Oil and Gas Commission (OGC) came to the conclusion that three earthquakes in the vicinity of Fort St. John at the end of November was caused by hydraulic fracturing operations (fracturing).

The quake struck about 20 kilometers south of the city on November 29. OGC said they were the result of a fracturing operation carried out by Canadian Natural Resources Ltd. (CNRL)

Quakes were recorded in the sizes 3.4, 4.0 and 4.5.

4.5 magnitude quake near Fort St. john

OGC stated that it did so based on the fact that the CNRL performed hydraulic fracturing during shocks, and that the epicenter of the quakes and the strongest "felt" reports was located near the "G" and "H" wells of the company.

The OGC stated that the CNRL correctly performed integrity assessments and did not report any problems. After the quakes, the company immediately suspended its fracturing operations and then cooperated with the regulators.

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According to the OGC, the CNRL was drilled in the natural gas-rich lower Montney formation when shocks appeared.

The company made seven other Montney upper shafts earlier this year, but never recorded a seismic event worth more than 2.5 magnitude at that time.

It was found that the company submitted a preliminary assessment report for a pair of wells in the lower Montney formation, which concluded that "seismicity would probably occur, but no more than 3 mag events were expected."

Fort quake John was "very likely" because of fracking: officials

The OGC stated that the fracturing operations on the 5-22 CNRL well are suspended during the detailed technical inspection, however other companies operating in this area may resume operations.

Companies planning to resume work must submit corrected seismic reports.

The regulator said that it also works with field operators to catalog known geological errors and performs a third-party review of geomechanical properties, hydraulic fracture design and seismological data to improve the assessment of induced seismic hazards.

© 2018 Global News, a division of Corus Entertainment Inc.

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