North Dakota oil producers were dealt another blow this week when Royal Dutch Shell Plc (NYSE: RDS.A) said it would scrap plans to build an oil train terminal in Washington state that would have taken more than 400,000 barrels (bbl) per week of Bakken and other inland crudes.

Shell's move on Oct. 6 comes at a bad time for Bakken producers, who have endured a two-year price rout and need new routes to move their oil to coastal refineries.

Inland North American producers have seen four projects stymied since September, owing to both environmental opposition and an oversupplied global oil market that make it easier and cheaper to import cargoes than transport inland crude thousands of miles on railcars.

On Oct. 5, San Luis Obispo, Calif., city planners rejected a rail terminal proposed by Phillips 66 (NYSE: PSX), two weeks after the city council of Benicia rejected Valero Energy Corp.'s (NYSE: VLO) proposed 70,000 bbl/d facility.

Not long before that, protests by Native Americans worried about environmental impact prompted the U.S. government to halt work on the 470,000 bbl/d Dakota Access Pipeline, which would take North Dakota oil to the Midwest and Gulf Coast.

The potential loss of takeaway capacity on Dakota Access and a drop in West Coast demand could spell more pain for producers in the Bakken, where output has fallen by more than 15% on the prolonged rout in oil prices.

"This development [with Shell], along with the developments regarding the [Dakota Access], will hurt Bakken producers' netbacks," Sarp Ozkan, a senior energy market analyst with Denver-based Ponderosa Advisors, said in reference to profits.

Shell said the conditions of the global crude market and a tight capital environment made its project uneconomic.

Shell's rail facility would have connected to an existing rail line and supplied Shell's 145,000 bbl/d Anacortes refinery with light crude from North Dakota.

Phillips 66 this week said it is considering appealing the City Planning Commission's decision.

Current pipeline and refining capacity out of the Bakken is around 851,000 bbl/d, and about 60% of its output leaves the region on pipeline, according to the state's pipeline authority.

Nearly all of the rest goes by rail, which has loading capacity around 1.52 MMbbl/d.

Despite the latest setbacks, Jonathan Garrett, a principal analyst at consultancy Wood Mackenzie, said low prices are still a bigger concern for North Dakota producers than transportation.

"The biggest challenge to the Williston Basin right now isn't transportation, it's oil prices. Takeaway capacity is a concern but that's not going to be the thing that makes the Williston Basin a difficult place to operate," he said.

Benchmark U.S. oil prices have jumped by more than $6 per barrel in the last week following news that OPEC has reached an agreement to curb supply, with West Texas Intermediate (WTI) futures settling above $50/bbl on Oct. 6.

Higher oil prices could unleash a wave of supply from the Bakken, which as of June had more than 700 drilled-but-uncompleted wells, more than any other major shale region in the U.S., according to data from Wood Mackenzie.

Bakken discounts to WTI have narrowed sharply since 2013, and in early October were at about $1. That is good for Bakken producers, but makes paying for costly rail too expensive for West Coast refiners.

Railed volumes entering the West Coast from the Midwest fell to around 106,000 bbl/d this summer, off 43% from a peak in November 2015, according to the U.S. Energy Information Administration.