鄂尔多斯盆地王庄区延长组长2储层成岩作用

通过岩心观测,薄片鉴定、X衍射分析、扫描电镜分析等方法,深入分析了王庄地区延长组长2储层岩石学特征、成岩作用类型其影响储层物性的因素。研究结果表明：王庄地区延长组长2储集岩主要为长石砂岩、岩屑长石砂岩;颗粒间以点-线接触或线接触为主,胶结类型主要有薄膜-孔隙式胶结、孔隙-薄膜式胶结;砂岩的成分成熟度较低,结构成熟度较高,分选较好,磨圆以次棱角状为主;储层砂岩孔隙类型主要为粒间孔、溶孔为主;长2砂岩孔隙结构属大孔中-细喉型。长6油层组所经历的成岩作用较复杂,主要的成岩作用有压实作用、胶结作用和溶蚀作用。研究区长2储层物性受控于沉积环境、成岩作用及微裂缝。

Diagenesis of Chang2 Reservoir of Yanchang Formation in Wang Zhuang Area of the Ordos Basin

The characteristics of petrology, the diagenesis and porosity evolution of Chang2 reservoir of Yanchang formation in Wang Zhuang area were analysed by using methods of core and cuttings observation, thin section ap- praisal, X -diffraction analysis, and scanning electron microscope. The results showed that the sandstone types of Wang Zhuang area were arkose sandstone and lithic arkose sandstone. They were mainly in reangular andreround forms,line and point - line contact forms with pore and pore - thin film cementation between rockgrains. The Chang 2 reservoir sandstone pore types were mainly intergranular pore, dissolution pores ; Chang 2 sandstone pore structure was a large hole - thin throat. The study reservoir was mainly characterized by low compositional maturity and high textual maturity. The diagenetic factors of Chang 2 reservoirs included compaction, cementation and corrosion. The Chang 2 reservoir was controlled by the depositional environment, diagenesis and micro cracks.