吴起油田长6油层组储层成岩作用及其对物性的影响

通过对大量取心井砂岩样品的铸体薄片、扫描电镜、X射线衍射、镜质体反射率分析,研究了吴起油田长6油层组储层的成岩作用类型及其对储层物性的影响,认为导致该区储层物性差的主要成岩作用类型是机械压实作用和碳酸盐胶结作用,溶蚀作用在一定程度上改善了储层物性,但溶蚀程度较低,使该区长6油层组储层物性较相邻地区同一层位要差.

Diageneses of Chang-6 sandstone reservoir in Wuqi Oilfield, Erdos Basin and their effects on reservoir property

The Chang-6 sandstone reservoir in this area is a set of medium-low porosity,super-low permeability reservoir.Through the analyses of cast thin sections,scanning electron microscope(SEM),X-ray diffraction, vitrinite reflectance of more than 50 sandstone samples,the diagenesis types of the sandstone reservoir and their effects on reservoir property are studied.It is held that mechanical compaction and carbonate cementation are the main factors of leading to the bad property of the reservoir,while dissolution improves the property of the reservoir in some degree.But the improvement of dissolution is relatively faint.Therefore,compared with near zones,the property of Chang-6 reservoir in this area is worse.