basis reserve
6.The relationship of reserve-production ratio and time and the cut-off value of stable production have been derived on basis of Arps decline curve and mathematical model of production prediction.
10.Altai Region, which is very rich in ecological tourism resources and prairie culture tourism resources, is the reserve base of tourism resources in Xinjiang. On the basis of the investigation of tourism resources in this region, the characteristic of tourism resources and golden opportunity of tourism development in this region is analyzed. Furthermore, the hierarchical structure and strategy of tourism development is proposed.

