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Legal Update

California Moves to Further Regulate Unconventional Oil and Gas Production: A Review of Senate Bill 4 and Its Potential Impact on Shale Development in the Golden State

4 November 2013
Mayer Brown Legal Update
With the rapid expansion of US shale oil and gas production in recent years, it has become increasingly important for operators and oilfield services companies to stay informed about new regulatory developments. This update addresses California’s recently enacted Senate Bill 4 and its potential impact on future unconventional oil and gas development in the state. Senate Bill 4 applies broadly to oil and gas activities involving “well stimulation treatments,” which include hydraulic fracturing, a process that has been essential to shale oil and gas production in other states.


  • Kevin L. Shaw
    Senior Counsel
    T +1 713 238 2665
  • John D. Furlow
    T +1 713 238 2637

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