川西北地区栖霞组白云岩储集层研究

根据川西北地区栖霞组野外及钻井岩心的宏观、微观及地球化学特征，结合物性资料，研究了该套地层中白云岩储集层的基本特征及主要控制因素，归纳并总结了这类储层的分布规律及形成与演化过程。认为栖霞组白云岩储集层以细晶白云岩、中 粗晶白云岩和颗粒白云岩为主；储集空间以次生成因的孔、洞为主，裂缝除具有一定的储集性能以外，更重要的是起到了连通孔隙的作用；储集空间组合类型以裂缝 孔洞型和裂缝 孔隙型为主。这类储集岩的形成与演化主要受到沉积和成岩作用的控制。

The Study of Dolomite Reservoirs in Qixia Formation in the Northwest of Sichuan Region

Based on the macro, micro and geochemical characteristics of the drilling core and field of Qixian formation in the northwest of Sichuan region and combined with routine petrophysical data, the basic features and the main controlling factors of the dolomite reservoirs within the types of strata are studied and the spatial evolution and distribution pattern of this kind of reservoirs are summarized in this paper. It is concluded that the dolomite reservoirs of Qixia formation consist of fine dolostone， mid-wide-crystal dolostone and grain dolostone, the pore space is predominated by secondary solution vugs. Fractures not only posses a certain capacity of storage, but also mainly play the role of connecting the pores. Fracture-vug and fracture-pore are the two of main types of reservoir pore space. The spatial evolution of this kind of reservoirs are mainly controlled by the effect of the sedimentation and diagenesis.