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Oil and Natural Gas Properties | 3 Months Ended
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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, 2021 |  | September 30, 2021
| (In thousands)
Proved | $ | 421,779 |  |  | $ | 402,165 |
Unproved | 18,839 |  |  | 20,557 |
Work-in-progress | 13,534 |  |  | 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.

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- Definition The entire disclosure for properties used in normal conduct of oil and gas exploration and producing operations. This disclosure may include property accounting policies and methodology, a schedule of property, plant and equipment gross, additions, deletions, transfers and other changes, depreciation, depletion and amortization expense, net, accumulated depreciation, depletion and amortization expense and useful lives. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -URI http://asc.fasb.org/subtopic&trid=2145654 + Details
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