Exhibit 22.1

List of Guarantor Subsidiaries

The following subsidiaries of Oasis Petroleum, Inc. (the "Issuer") were, as of March 31, 2020, guarantors of the Issuer's Senior Notes:

Entity						Jurisdiction of Formation
Oasis Midstream Services LLC						Delaware
Oasis Petroleum LLC						Delaware
Oasis Petroleum Marketing LLC						Delaware
Oasis Petroleum North America LLC						Delaware
Oasis Petroleum Permian LLC						Delaware
Oasis Well Services LLC						Delaware
OMP GP LLC						Delaware
OMS Holdings LLC						Delaware