鄂尔多斯盆地东部上古生界石英砂岩储层成岩及孔隙演化

UPPER PALEOZOIC QUARTZ-SANDSTONE RESERVOIR DIAGENESIS AND PORE EVOLVEMENT,EASTERN ORDOS BASIN

在详细观察描述岩芯的基础上,对铸体薄片进行了系统研究,并结合扫描电镜、电子探针、能谱、X-衍射、阴极发光和稳定同位素分析,认为溶蚀作用、凝灰质的蚀变作用、高岭石化作用和微裂隙化作用等对本区储层发育起建设性作用;相反,机械压实作用、化学压溶作用、S iO2的胶结作用、碳酸盐矿物充填与交作用代、碎屑粘土化作用等使储层进一步致密化。

The results of the core observation and account and the systematic slice observation, together with the analysis of SEM, electron microprobe （EMP）, energy spectrum, X-ray diffraction, cathode luminescence, isotopic compositions, indicate that dissolution, tuffaceous alteration kaolinization and microfissuring （microfraturing） can enhance reservoir quality, in contrast, they make the reservoir more compacter with mechanical compaction, chemical pressolution, cementation of SiO2, filling and emplacement of carbonate minerals, fragment clayization etc.