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

Oil and natural gas properties are comprised of the following:
 
 
June 30,
2015
 
December 31, 2014
Oil and natural gas properties
$
3,566,211

 
$
2,838,573

Less: accumulated depletion
(1,953,660
)
 
(1,942,380
)
Oil and natural gas properties, net
$
1,612,551

 
$
896,193


 
Depletion, depreciation, accretion, and amortization expense for the three months ended June 30, 2015 and 2014 was $175,815 and $92,040, respectively, and for the six months ended June 30, 2015 and 2014 was $251,014 and $170,071, respectively. During the six months ended June 30, 2015 and 2014, the Company recorded impairment losses of $306,387 and $0, respectively.