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Oil and Natural Gas Properties
 9 Months Ended
Sep. 30, 2022
Extractive Industries [Abstract]  
Oil and Natural Gas Properties Oil and Natural Gas Properties
Oil and natural gas properties are summarized below:
September 30, 2022December 31, 2021
(In thousands)
Proved$508,834 $421,779 
Unproved12,937 18,839 
Work-in-progress26,008 13,534 
547,779 454,152 
Accumulated depletion and amortization(116,712)(95,021)
Total oil and natural gas properties, net$431,067 $359,131 
Depletion and amortization expense for proved oil and natural gas properties was $8.2 million and $6.5 million for the three months ended September 30, 2022 and 2021. Depletion and amortization expense for proved oil and natural gas properties was $21.7 million and $19.3 million for the nine months ended September 30, 2022 and 2021, respectively.
Exploration expense was $20 thousand and $0.9 million for the three months ended September 30, 2022 and 2021, respectively, and $1.5 million and $9.1 million for the nine months ended September 30, 2022 and 2021, respectively. Exploration expense was primarily attributable to the expiration of oil and natural gas leases for the nine months ended September 30, 2022 and three and nine months ended September 30, 2021.