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Oil and natural gas properties (under successful efforts accounting)
9 Months Ended
Sep. 30, 2015
Extractive Industries [Abstract]  
Oil and natural gas properties
Oil and natural gas properties, net of accumulated impairment (under successful efforts accounting)

Oil and natural gas properties are comprised of the following:
 
 
September 30,
2015
 
December 31, 2014
Oil and natural gas properties
$
3,578,864

 
$
2,838,573

Less: accumulated depletion
(2,036,467
)
 
(1,942,380
)
Oil and natural gas properties, net
$
1,542,397

 
$
896,193


 
Depletion, depreciation, accretion, and amortization expense for the three months ended September 30, 2015 and 2014 was $84,423 and $81,952, respectively, and for the nine months ended September 30, 2015 and 2014 was $335,437 and $252,024, respectively. During the nine months ended September 30, 2015 and 2014, the Company recorded impairment losses of $309,539 and $0, respectively.