Marathon Spuds Exploration Well Targeting the Tyler Formation

Tyler Formation Well Test Could Add to Marathon's Drilling Inventory
Williston Basin Strat Column

Williston Basin Strat Column | Click to Enlarge

Marathon Oil is drilling a horizontal well in the Tyler formation in Slope County this month.

The formation has produced from vertical wells for years and is comparable to the Bakken from a geology perspective. Both plays include a limestone formation sandwiched by shales.

Marathon has a four well development plan approved and believes the wells could yield an average of 400,000 boe each. That’s comparable to Bakken production rates.

It’s very early, but watch for additional announcements. It might be a while before we get well results, but Marathon and possibly others will expand their testing plans if the wells prove successful.

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R.T. Dukes

R.T. Dukes

Managing Editor at
R.T. is the managing editor and a contributor to and His experience includes research and consulting roles where he advised major oil companies. His current life revolves around his wife, two kids, and shale plays. He has been following the Bakken since early 2006. 2503 Robinhood, Houston, TX, 77005, U.S.A. | Telephone: 832.429.4790


  1. judy prociv says:

    I am interested in the well Marathon is drilling in slope county. We have mineral rights there. Keep me informed if you can. judy

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