Geologic Characteristics and Sedimentary Reservoir of Dina 2 Gas Field in Kuche Depression
库车坳陷迪那2气田地质特征与沉积储层研究

Dina gas field is a large gas reservoir with the proved reserves in 2006 of more than one hundred billion cubic meters in Kuche depression, and its gas\|bearing layers are Suweiyi Formation and Kumugeliemu Group of Palaeogene age. It is believed that Dina 2 gas field is a long E\|W\|trending axis anticline controlled by the north and south thrust faults. The reservoir rocks are mainly silt stone and fine sand stone, and the types of pore are mainly primary intergranular pores, to a lesser extent, primary solution pores, microfissures and micropores. In general, the reservoir is of low porosity and low permeability or extra low permeability with strong heterogeneity. The reservoir is mainly controlled by sedimentary facies, and its diagenetic stage is in the period of middle diagenesis subage A. Compaction, cementation and solution are the main influence factors of reservoir property. With intense solution, secondary pores are developed, and the reservoir gets better.