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Oil and Natural Gas Properties | 6 Months Ended
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Mar. 31, 2022
Extractive Industries [Abstract] |
Oil and Natural Gas Properties | Oil and Natural Gas Properties Oil and natural gas properties are summarized below:
| March 31, 2022 |  | September 30, 2021
| (In thousands)
Proved | $ | 433,274 |  |  | $ | 402,165 |
Unproved | 16,491 |  |  | 20,557 |
Work-in-progress | 28,207 |  |  | 11,411 |
| 477,972 |  |  | 434,133 |
Accumulated depletion and amortization | (101,441) |  |  | (88,336) |
Total oil and natural gas properties, net | $ | 376,531 |  |  | $ | 345,797 |
Depletion and amortization expense for proved oil and natural gas properties was $6.4 million and $6.1 million respectively, for the three months ended March 31, 2022 and 2021. Depletion and amortization expense for proved oil and natural gas properties was $13.1 million and $12.0 million, respectively, for the six months ended March 31, 2022 and 2021. Exploration expense was $1.5 million and $5.5 million, respectively, for the three months ended March 31, 2022 and 2021, and $2.1 million and $5.9 million, respectively, for the six months ended March 31, 2022 and 2021. Exploration expense was primarily attributable to the expiration of oil and natural gas leases for the three and six months ended March 31, 2022 and 2021.

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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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