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对鄂尔多斯盆地Y25、Zh40区块长6段储层的岩石学特征、微观孔隙结构、成岩作用等进行详细研究。研究发现,胶结作用对储层质量的影响具有双重作用。胶结作用一定程度上提高储层的抗压实能力,也为后期的次生溶蚀提供物质基础,但胶结物的产生也占据一定的孔隙空间。两区块储层成岩作用是物性演化的最主要控制因素,储层类型为次生低渗透储层(或成岩型低渗透储层)。Y25区块表现为早期胶结作用和后期的溶蚀作用强;Zh40区块表现为早期压实作用强,后期溶蚀作用、交代作用强。储层形成过程中物性演化的主要控制因素是沉积环境基础上,成岩场和构造应力场共同作用的结果。
The petrological characteristics, microscopic pore structure and diagenesis of the reservoirs of Chang 6 Member of Y25 and Zh40 blocks in Ordos Basin are studied in detail. The study found that the effect of cementation on reservoir quality has a dual role. The cementation enhances the compressive strength of the reservoir to some extent, and also provides the material foundation for the later secondary dissolution. However, the cementation produces a certain amount of pore space. The diagenesis of two blocks is the main controlling factor of physical evolution. The reservoir type is secondary low permeability reservoir (or diagenetic low permeability reservoir). The Y25 block is characterized by early cementation and later dissolution. The Zh40 block is characterized by strong early-stage compaction and later-stage dissolution and strong accountability. The main controlling factor of the evolution of physical properties during reservoir formation is the result of the interaction of diagenetic and tectonic stress fields on the basis of sedimentary environment.