Tullow Oil's stock, which surged on the news from oil discoveries offshore Guyana, shed as much as 22% of its value on Nov. 13.
Companies that fracture wells are cutting workers and idling equipment.
Last year, BHP ended a massive loss-making seven-year foray into shale by selling most of its U.S. onshore shale oil and gas assets to BP for $10.5 billion.
The company said it expects several of its growth projects to be operational in 2019, including the $700-million Gray Oak pipeline.
The company also reported Nov. 6 that oil production grew 12% to 464,100 barrels per day during third-quarter 2019.
Marathon Oil also unveiled a new Delaware Basin oil play with over 60,000 contiguous net acres in Ward and Winkler counties, Texas.
Offshore services provider Subsea 7 cut its 2019 revenue outlook on Nov. 7 but predicted a rebound next year as demand for oilfield services and from renewable energy providers is set to increase, boosting its shares almost 6%.
Marathon Oil Corp. reported a 44.5% fall in quarterly adjusted profit on Wednesday, as weak crude and gas prices limited gains from higher output in its U.S. shale basins.
The company reported a net loss of $19.1 million, or 21 cents per share, in the third quarter ended Sept. 30, compared with a profit of $121.4 million, or $1.32 per share, a year earlier.
Net income attributable to the company rose to $368 million, or $2.26 per share, in the three months ended Sept. 30, from $157 million, or $1.59 per share.