库车坳陷迪那2气田地质特征与沉积储层研究

迪那2气田是塔里木盆地库车前陆区2006年探明的储量为1 000亿 m³以上的大型气田，含气层位为古近系苏维依组与库姆格列木群。综合各种研究认为，迪那2气田主要位于受南北2条逆冲推覆断层所夹持的一个东西向展布的长轴背斜带；储集岩以粉砂岩、细砂岩为主，孔隙类型以原生粒间孔为主，次为粒间和颗粒溶孔、微裂缝、微孔隙，总体上属于低孔低渗和低孔特低渗储层，且非均质性强；储层主要受沉积相带控制，储层成岩阶段总体达中成岩A亚期，对储集性能有影响的主要是压实作用、胶结作用和溶蚀作用，其中溶蚀作用较强，使次生孔隙发育，这是储层物性变好的一个重要原因。

Geologic Characteristics and Sedimentary Reservoir of Dina 2 Gas Field in Kuche Depression

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.