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Oil and Natural Gas Properties
3 Months Ended
Dec. 31, 2021
Extractive Industries [Abstract]  
Oil and Natural Gas Properties Oil and Natural Gas Properties
Oil and natural gas properties are summarized below:
December 31, 2021September 30, 2021
(In thousands)
Proved$421,779 $402,165 
Unproved18,839 20,557 
Work-in-progress13,534 11,411 
454,152 434,133 
Accumulated depletion and amortization(95,021)(88,336)
Total oil and natural gas properties, net$359,131 $345,797 
Depletion and amortization expense for proved oil and natural gas properties was $6.7 million and $5.9 million for the three months ended December 31, 2021 and 2020, respectively.
The Company incurred $0.6 million and $0.4 million of exploration costs, which primarily related to the expiration of oil and natural gas leases for the three months ended December 31, 2021 and 2020, respectively.