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为了研究碳酸盐岩的微观溶蚀机理,本文采用溶蚀实验和镜像观察的方法,研究了塔中北斜坡鹰山组3种类型碳酸盐岩的溶蚀过程及微观溶蚀特征。结果表明:在相同实验条件下,亮晶生屑灰岩、云质灰岩和泥晶颗粒灰岩的溶蚀量基本一致。由于对物质成分和岩石微结构的选择性溶蚀,它们的微观溶蚀特征存在明显差异。亮晶生屑灰岩和泥晶颗粒灰岩样表面整体被溶蚀降低。云质灰岩样表面方解石部分整体被溶蚀降低,形成铸模孔,白云石溶蚀成蜂窝状溶蚀孔,并突出岩石表面,白云石晶间缝溶蚀加大且相互连通,这对油、气和地下水储渗具有重要意义。
In order to study the mechanism of microscopic dissolution of carbonate rocks, the dissolution and microscopic erosion characteristics of three types of carbonate rocks in the Yingshan Formation of the northern Tazhong slope are studied by means of erosion experiments and mirror observations. The results show that under the same experimental conditions, the dissolution rates of brightly litke limestone, dolomitic limestone and limestone are basically the same. Due to the selective dissolution of material composition and rock microstructure, their microscopic erosion characteristics are obviously different. The surface of brightly litke limestone and limestone-like limestone samples are all reduced by dissolution. The calcite on the dolomite-like surface is partially eroded to form a mold hole, which dissolves into a honeycomb-shaped eroded hole and highlights the surface of the rock. The dissolution of dolomite intergranular cracks increases and interconnects with each other, which affects oil, gas and groundwater Infiltration is of great significance.