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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 
At December 31, 2021 and September 30, 2021, the Company had one exploratory well drilled but uncompleted that was included in work-in-progress with associated well costs of $3.7 million for both periods. At December 31, 2021, the Company had one exploratory well with costs of $3.7 million that has been capitalized for greater than one year but less than two years. The Company is evaluating completion methods for this exploratory well.
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.