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Exploratory Well Costs
9 Months Ended
Sep. 30, 2020
Capitalized Exploratory Well Costs [Abstract]  
Exploratory Well Costs Exploratory Well Costs
EOG's net changes in capitalized exploratory well costs for the nine-month period ended September 30, 2020, are presented below (in thousands):
 Nine Months Ended
September 30, 2020
Balance at January 1$25,897 
Additions Pending the Determination of Proved Reserves86,624 
Reclassifications to Proved Properties(34,087)
Costs Charged to Expense (1)
(23,872)
Balance at September 30$54,562 
(1)Includes capitalized exploratory well costs charged to either dry hole costs or impairments.

At September 30, 2020, all capitalized exploratory well costs had been capitalized for periods of less than one year.