Quarterly report pursuant to Section 13 or 15(d)

6. Property and Equipment (Tables)

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6. Property and Equipment (Tables)
9 Months Ended
Sep. 30, 2016
Property and equipment:  
Property and equipment
    September 30,     December 31,  
    2016     2015  
Property and equipment   $ 140,547     $ 139,004  
Less: Accumulated depreciation and amortization     (108,705 )     (97,857 )
Total property and equipment, net   $ 31,842     $ 41,147  
Depreciation, depletion, and amortization expense
    Nine Months Ended  
    September 30,  
    2016     2015  
Depletion of costs for evaluated oil and gas properties (1)   $ 3,114,347     $ 7,346,356  
Depreciation and amortization of other property and equipment     10,848       12,286  
Total depreciation, amortization and depletion   $ 3,125,195     $ 7,358,642