川西北地区中二叠统白云岩储层特征与评价

Middle Permian dolomite reservoir characteristics and evaluation in northwestern Sichuan basin

川西北地区中二叠统白云岩储层具有良好的勘探潜力,本文通过薄片的观察并结合野外露头和钻井剖面等资料,认识到中二叠统白云岩内储集空间主要为晶间孔、晶间溶孔、溶蚀孔洞以及热液破裂缝,主要发育白云岩溶蚀孔洞型储层,储层发育受热液地质作用控制,热液白云岩构成储层发育的基础,热液溶蚀作用形成缝孔洞,构成储层储渗空间,导致储层的形成。最终认为川西南地区是白云岩储层发育的最有利区域,川西中段是白云岩储层发育的有利区域,川西北段是白云岩储层发育的较有利区域。

The middle Permian＇s dolomite reservoir in the north west region of Sichuan has a good exploration potential.Through the thin section observation and the data of outcrop and drilling,this article argues that the middle Permian dolomite reservoir space mainly includes intergranular holes,intergranular dissolution pores,caverns,the hydrothermal breaking cracks.The main reservoir type is dissolution vug dolomite reservoir, and the development of reser voir is controlled by hydrothermal geological effect.The hydrothermal dolomite constitute the basis for the development of reservoir. And hydrothermal dissolution formed seams and holes. It constituted the reservoir spaces and resulted in the formation of reservoir. The final analy sis is that southwest region is the most favorable area,the middle of Sichuan is favorable area.northwest region is more favorable area.