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通过18口井的岩心观察和测井资料分析、85件铸体薄片的鉴定、24块样品的扫描电镜观察、271组物性数据的统计,对鄂尔多斯盆地榆北气田山2段砂岩储层特征进行研究,结果表明:该套储层曾遭受低温热液改造,次生孔隙发育,长石几乎被完全溶解;储集空间以剩余原生粒间孔、粒间溶孔和微裂缝组合为主,粘土矿物晶间微孔对储层也有贡献;储层发育受沉积相、碎屑成分、成岩和构造作用共同影响,其中有利的沉积微相控制了储层空间分布;碎屑成分和粒度与储层物性好坏有直接关系,是形成储层的物质基础;成岩作用对储层的影响有利有弊,压实和胶结作用可使原生孔隙大部分丧失,而热液溶蚀作用形成的次生孔隙,可大幅度提高储层的孔渗性,是形成优质储层的关键。
Based on the core observation and logging data analysis of 18 wells, the identification of 85 cast films, the scanning electron microscopic observation of 24 samples and the statistics of 271 sets of physical data, the sandstone reservoir characteristics of Shan 2 Member in Yubei Gas Field, Ordos Basin, The results show that the reservoirs have been subjected to low-temperature hydrothermal reforming and secondary porosity development, and almost completely dissolved feldspar. The reservoirs are dominated by the combination of remaining primary intergranular pores, intergranular dissolved pores and microcracks. Clay The intergranular micro-pores also contribute to the reservoir. The reservoir development is affected by sedimentary facies, detrital components, diagenesis and tectonism. The favorable sedimentary microfacies control the spatial distribution of the reservoirs. The composition and grain size of the detritus and the reservoir Physical properties are directly related to the formation of the reservoir material foundation; diagenesis of the reservoir has both advantages and disadvantages, compaction and cementation can make most of the loss of primary porosity, hydrothermal dissolution secondary pores formed, Can greatly improve the porosity and permeability of the reservoir, which is the key to forming a good reservoir.