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根据铸体薄片、扫描电镜、阴极发光、压汞资料等的研究,对鄂尔多斯盆地南泥湾油田康台区上三叠统延长组长6砂岩储层特征进行了综合分析及评价。通过分析可知,长6储层主要为灰色细粒长石砂岩,其成岩作用复杂多样。绿泥石薄膜、浊沸石胶结以及绿泥石充填胶结,石英、长石的次生加大是成岩过程中主要的胶结作用;溶蚀作用产生了大量次生孔隙。主要储集空间为原生粒间孔和次生孔隙。结合本区储层的宏观和微观特征,将其分为Ⅰ、Ⅱ(Ⅱa、Ⅱb亚类)、III三类,本区长6储层以Ⅱ类储层为主,尤其以Ⅱa类储层为主。
Based on the study of cast thin films, scanning electron microscopy, cathodoluminescence and mercury intrusion data, the characteristics of Chang 6 sandstone reservoir in Yanchang Formation of Upper Triassic in Kangtai District, Nanniwan Oilfield, Ordos Basin are comprehensively analyzed and evaluated. The analysis shows that the Chang 6 reservoir is mainly composed of fine grained feldspar sandstone and its diagenesis is complex and diverse. Chlorite thin films, talc zeolite cements and cements filling cements, secondary growth of quartz and feldspar are the main cementation in the diagenesis process; a large amount of secondary porosity is produced by dissolution. The main reservoir space for the original intergranular pores and secondary pores. Based on the macroscopic and microscopic characteristics of the reservoirs in this area, they are divided into Ⅰ and Ⅱ (sub-groups Ⅱa and Ⅱb) and III. The Ⅱ reservoirs of Chang 6 reservoir in this area are mainly composed of Ⅱa reservoirs Mainly.