Research on the Definition of Economic Limits for the Development of Unconventional Natural Gas under New Situations

Table 5

Probability of economic infeasibility at different well depths.

Depth (m)	Drilling cost (10^4 Ұ)	P (NPV <0) (%)
1200	143.59	51.8
1250	151.98	53.1
1300	160.38	57.6
1350	168.76	60.7
1400	177.16	64.1