Get ready for some bad news and red ink.

With the bulk of quarterly earnings reports in the energy industry yet to be announced, there are already $6.5 billion worth of asset write-downs, according to Bloomberg. And that could be just the tip of the iceberg. A Barclays’ assessment last week predicted $20 billion in impairment charges from just six companies.

Write-downs occur when the expected future cash flow from an asset falls sufficiently that a company has to report that the asset has lost some of its value. With oil prices half of what they were from mid-2014, oil and gas fields around the world are no longer worth what they used to be. Some oil fields that were previously expected to produce in the future may no longer even make sense to develop given current oil prices. As a result, investors should expect billions of dollars in further write-downs in the coming weeks.

Persistently low oil prices are putting a lot of pressure on the dividend policies of oil and gas producers. The Wall Street Journal reported that four oil majors – BP, Royal Dutch Shell, ExxonMobil, and Chevron – have a combined cash flow deficit of $20 billion for the first half of 2015. In other words, these big players are not earning enough revenues to cover expenditures, share buybacks, and dividends. With such a large cash flow deficit, something has to give. All four are focusing on slashing spending in order to preserve their promises to shareholders, with dividends especially seen as untouchable.

Read more: Oil Price