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Oil and Natural Gas Properties
 9 Months Ended
Jun. 30, 2022
Extractive Industries [Abstract]  
Oil and Natural Gas Properties Oil and Natural Gas Properties
Oil and natural gas properties are summarized below:
June 30, 2022September 30, 2021
(In thousands)
Proved$469,968 $402,165 
Unproved13,655 20,557 
Work-in-progress27,384 11,411 
511,007 434,133 
Accumulated depletion and amortization(108,481)(88,336)
Total oil and natural gas properties, net$402,526 $345,797 
Depletion and amortization expense for proved oil and natural gas properties was $7.0 million and $6.7 million respectively, for the three months ended June 30, 2022 and 2021. Depletion and amortization expense for proved oil and natural gas properties was $20.1 million and $18.7 million, respectively, for the nine months ended June 30, 2022 and 2021.
Exploration expense was $22 thousand and $2.8 million, respectively, for the three months ended June 30, 2022 and 2021, and $2.1 million and $8.7 million, respectively, for the nine months ended June 30, 2022 and 2021. Exploration expense was primarily attributable to the expiration of oil and natural gas leases for the nine months ended June 30, 2022 and three and nine months ended June 30, 2021.