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|View History: Annual Download Data (XLS File)                                                  
|View History: Annual                                                                            
|View History: Annual                                                                            
|View History:                                                                                   
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|Montana Natural Gas, Wet After Lease Separation Reserves Revision Decreases (Billion Cubic Feet)
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|Montana Natural Gas, Wet After Lease Separation Reserves Revision Decreases (Billion Cubic Feet)
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|Decade                                                                                                                            | Year-0 | Year-1 | Year-2 | Year-3 | Year-4 | Year-5 | Year-6 | Year-7 | Year-8 | Year-9
|--------------------------------------------------------------------------------------------------------------------------------- | ------ | ------ | ------ | ------ | ------ | ------ | ------ | ------ | ------ | ------
|1970's                                                                                                                            |        |        |        |        |        |        |        |        |        | 88    
|1980's                                                                                                                            | 192    | 83     | 98     | 81     | 80     | 41     | 32     | 16     | 33     | 26    
|1990's                                                                                                                            | 32     | 34     | 21     | 11     | 77     | 14     | 12     | 134    | 44     | 56    
|2000's                                                                                                                            | 134    | 91     | 110    | 26     | 125    | 123    | 79     | 75     | 57     | 213   
|2010's                                                                                                                            | 101    | 99     | 195    | 51     | 56     | 90     | 44     | 6      | 64     | 67    
|2020's                                                                                                                            | 148    | 28     |        |        |        |        |        |        |        |       
|- = No Data Reported;  -- = Not Applicable;  NA = Not Available;  W = Withheld to avoid disclosure of individual company data.
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|Release Date: 12/30/2022                                                                                                         
|Next Release Date: 12/29/2023