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通过野外区域地质探查,结合研究区地质资料、钻井、测(录)井、岩心薄片以及其他测试资料,对鄂尔多斯盆地马宁地区延9油层组储层的岩石学特征、物性特征、孔隙结构以及孔隙类型等方面进行综合性研究,分析影响储层储集性能的因素。结果表明,该区延9储层为三角洲平原沉积,其岩石学特征具体表现为矿物成熟度低而结构成熟度高,储层孔隙类型主要为粒间孔与溶蚀孔,大孔是主要的油气储集空间,粗喉和中细喉则是基本渗流通道,为中低孔、中低渗储集层。沉积微相以及成岩作用共同控制储层物性,平面上,沉积相带对储层物性进行控制,垂向上,压实作用与胶结作用是储层物性变差的主要因素,而溶蚀作用中产生的次生孔隙是储层物性改善的主要因素。
Based on the geologic exploration in the field and the geological data, drilling, logging (logging) wells, core sheets and other test data in the study area, the petrological characteristics, physical properties, pore structure and reservoir structure of the Yan 9 reservoir in Maning area, Ordos Basin, Pore type and other aspects of a comprehensive study of factors that affect reservoir performance. The results show that the Yan 9 reservoir in this area is delta plain sediment. Its petrological characteristics are characterized by low mineral maturity and high structural maturity. The pore types of reservoirs are mainly intergranular pores and dissolved pores. The major pores are the major hydrocarbon The reservoir space, the thick throat and the middle throat are the basic seepage channels, which are medium-low porosity and medium-low permeability reservoirs. Sedimentary microfacies and diagenesis jointly control reservoir physical properties. On the plane and sedimentary facies, reservoir physical properties are controlled. Vertical, compaction and cementation are the main factors that lead to poor reservoir physical properties. However, Secondary porosity is the main factor to improve reservoir physical properties.