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|View History: Annual Download Data (XLS File)                                                     
|View History: Annual                                                                               
|View History: Annual                                                                               
|View History:                                                                                      
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|Montana Nonassociated Natural Gas, Wet After Lease Separation, Proved Reserves (Billion Cubic Feet)
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|Montana Nonassociated Natural Gas, Wet After Lease Separation, Proved Reserves (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                                                                                                                            |        |        |        |        |        |        |        |        |        | 786   
|1980's                                                                                                                            | 1,186  | 1,247  | 789    | 813    | 748    | 793    | 725    | 704    | 733    | 821   
|1990's                                                                                                                            | 834    | 782    | 814    | 631    | 672    | 739    | 755    | 727    | 737    | 784   
|2000's                                                                                                                            | 822    | 822    | 820    | 956    | 872    | 837    | 874    | 848    | 817    | 681   
|2010's                                                                                                                            | 657    | 522    | 327    | 286    | 361    | 391    | 331    | 337    | 352    | 304   
|2020's                                                                                                                            | 310    | 431    |        |        |        |        |        |        |        |       
|- = 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