鄂尔多斯盆地主力产气层溶蚀孔洞特征

Denudation Pores and Cavities in a Main Gas producing Formation in Ordos Basin

从溶蚀孔洞的充填物类型及其特征、充填物组合类型及充填程度、充填物生成期次等３个方面系统研究了鄂尔多斯盆地主力产气层溶蚀孔洞的特征。结果表明：白云石、方解石、硬石膏３种主要充填溶蚀孔洞的矿物构成６种组合类型，充填物组合类型不同，其充填程度也不同；根据充填物的氧、碳同位素组成，将溶蚀孔洞的充填划分为３期。讨论了溶蚀孔洞的发育程度、充填物组合类型、充填程度及其平面展布特征。

Filling sediment types,assemblages and forming stages,and filling grades of denudation pores and cavities are analysed in No 5 member of Majiagou formation of lower Ordovician Series in Ordos gas field, a main productive formation Dolomites,calcites and anhydrites are major filling materials in the area,which constitute six filling assemblages Different assemblages result in different filling grades According to the stable isotope composition,three filling stages of pores and cavitites are recognized and the development of denudation pores and the distribution of main filling materials are discussed