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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 Increases (Billion Cubic Feet)
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|Montana Natural Gas, Wet After Lease Separation Reserves Revision Increases (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                                                                                                                            |        |        |        |        |        |        |        |        |        | 46    
|1980's                                                                                                                            | 74     | 103    | 74     | 61     | 57     | 67     | 60     | 59     | 49     | 93    
|1990's                                                                                                                            | 34     | 20     | 22     | 29     | 26     | 134    | 59     | 100    | 120    | 98    
|2000's                                                                                                                            | 131    | 82     | 41     | 46     | 73     | 64     | 66     | 94     | 41     | 134   
|2010's                                                                                                                            | 105    | 44     | 32     | 116    | 91     | 34     | 92     | 75     | 53     | 1     
|2020's                                                                                                                            | 160    | 110    |        |        |        |        |        |        |        |       
|- = 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