鄂尔多斯华庆地区长6储层特征分析

运用岩心观察、扫描电镜、铸体薄片、测井、压汞等资料，对华庆地区长6储层特征进行研究。结果表明，研究区储层砂岩类型以岩屑长石砂岩和长石岩屑砂岩为主；储层岩石成分成熟度低、结构成熟度中等、成岩程度较高，岩屑成分、填隙物成分都很复杂；孔隙类型以粒间孔和长石溶孔为主；储层为典型的低孔、低渗、超低渗储层，储层非均质性强；压实和胶结是造成储层孔隙度大幅度降低的主要成岩作用，但绿泥石膜胶结一定程度上改善了储层物性；沿解理或压实作用所造成的颗粒破裂缝发生的强烈溶蚀对次生孔隙贡献最大，对储层物性起建设性作用。

Reservoir Characteristics of Chang 6 in Huaqing Oilfield of Ordos Basin

Reservoir characteristics of Chang 6 in Huaqing oilfield were studied by observing cores, casting slices, scanning electron microscope, pressure mercury and logging data. The result shows that, types of the sandstone in research area are mainly lithic arkose and feldspathic litharenite, and the maturity of the sandstone is low, textural maturity of sandstone is medium and diagenetic grade is high, rock debris composition and interstitial material are both very complex. Pore types mainly include intergranular pore and feldspar dissolved pore. Besides, it has large plane porosity. This reservoir has typical low porous, low and ultra-low permeable, high degree of heterogeneity, has good correlation of petrophysical properties. Main reason of low porosity is compaction and cementation, but chlorite cementation is good for petrophysical properties and dissolution, happening in cleavage and crack caused by compaction.