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| Name of Subsidiary | | Jurisdiction of Incorporation or Organization | |
| Chord Energy LLC | | Delaware | |
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| Chord Energy Marketing LLC | | Delaware | |
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| Enerplus Corporation | | Alberta | |
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| Enerplus Energy Ltd. | | Alberta | |
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| Enerplus Resources U.S. Inc. | | Delaware | |
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| Enerplus Resources (USA) Corporation | | Delaware | |
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| Enerplus USA 2006 Acquisition Inc. | | Delaware | |
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| Enerplus Williston I LLC | | Delaware | |
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| Enerplus Williston II LLC | | Delaware | |
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| Oasis Petroleum North America LLC | | Delaware | |
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| Oasis Petroleum Permian LLC | | Delaware | |
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| Oasis Well Services LLC | | Delaware | |
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| OMS Holdings LLC | | Delaware | |
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| Oasis Investment Holdings LLC | | Delaware | |
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| Oasis SASR Holdings LLC | | Delaware | |
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| Spark Acquisition ULC | | Alberta | |
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| Spark Canadian Holdings Inc. | | Delaware | |
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| Whiting Holdings LLC | | Delaware | |
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| Whiting Oil and Gas Corporation | | Delaware | |
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| Whiting Programs, Inc. | | Delaware | |
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| Whiting ND Sakakawea LLC | | Delaware | |
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