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在前人研究的基础上,就鄂尔多斯盆地陕北斜坡构造单元三叠系延长组长6成岩作用类型分布及其影响因素做了简要总结和分析。整个区域长6期发育机械压实作用、胶结作用和溶蚀作用,低孔低渗储层的形成主要受到强烈机械压实作用的影响,绿泥石膜环边在抵抗压实作用,保护原生孔隙起到了关键性的作用,在全区各个部位都有分布。溶蚀作用是对改善研究区储层物性做出最大贡献的成岩作用。成岩作用受岩性、沉积微相和鼻状隆起构造的影响,其中,三角洲水下分流河道微相储层砂体发育,物性好,机械压实和胶结作用较弱;长石多少为后期溶蚀作用发生提供充足的物质基础,鼻状隆起影响油藏类型的同时影响成岩作用的发生。
On the basis of the previous studies, the paper summarizes and analyzes the type and influencing factors of Chang 6 diagenesis of the Triassic Yanchang Formation in the northern slope of the northern Ordos Basin. In the whole area, the development of mechanical compaction, cementation and dissolution in the long period of development of stage 6, the formation of low-porosity and low permeability reservoirs are mainly influenced by strong mechanical compaction, and the chlorite ring edge resists the compaction and protects the primary pores Played a key role in all parts of the region have distribution. Dissolution is the diagenesis that contributes most to improving reservoir physical properties in the study area. Diagenesis is affected by lithology, sedimentary microfacies and nasal uplift structure. Among them, deltaic underwater distributary channel microfacies reservoir sand body development, good physical properties, mechanical compaction and cementation are weak; feldspar is the number of late dissolution The role of occurrence to provide adequate material basis, nasal bumps affect the type of reservoir while affecting the occurrence of diagenesis.