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通过对34口钻井270个岩心样品的180个铸体薄片、38个扫描电镜、49个压汞、37个阴极发光、26个X衍射及10个包裹体等测试分析,对研究区营Ⅰ-沙Ⅰ段储层的岩石学特征、孔隙结构特征及储层物性等微观特征进行了较深入地研究。营Ⅰ-沙Ⅰ段储层岩石类型以长石岩屑砂岩和岩屑长石砂岩为主,少量长石砂岩及岩屑砂岩。碎屑颗粒结构以细、中砂为主,少量砂砾岩。岩石颗粒分选较好—中等,呈次棱角状—次圆状,成分、结构成熟度低;营Ⅰ-砂Ⅰ段储层孔隙类型主要有:原生粒间孔、粒间溶蚀扩大孔及少量裂缝的组合,其主要的油气储集空间为原生粒间孔和粒间溶孔;砂岩储层所经历的主要成岩作用有压实作用、胶结作用、溶蚀作用及构造破裂作用;其中对储层物性具建设性的作用主要有溶蚀作用和构造破裂作用;该区储层已进入中成岩阶段A期,其成岩作用相对较强。
Based on the testing and analysis of 180 castings, 38 scanning electron microscopy, 49 mercury intrusion, 37 cathodoluminescence, 26 X-ray diffraction and 10 inclusions in 270 core samples from 34 wells, The petrologic characteristics, pore structure characteristics and reservoir physical properties of Sha Ⅰ member reservoir are studied deeply. The rocks of Camp Ⅰ-Sha Ⅰ are mainly feldspathic sandstone and lithic feldspathic sandstone, with a small amount of feldspathic sandstone and lithic sandstone. Debris particle structure to fine, medium-based sand, a small amount of glutenite. The classification of rock particles is good - medium, sub-angular - sub-circular shape, composition, structure maturity is low; Camp Ⅰ-sand Ⅰ reservoir pore types are: primary intergranular pores, intergranular dissolution pores and a small amount Fractures. The main oil and gas reservoirs are primary intergranular pores and intergranular dissolved pores. The main diagenesis experienced by sandstone reservoirs is compaction, cementation, dissolution and tectonic rupture. For the reservoirs The constructive material properties mainly include dissolution and tectonic rupture. The reservoirs of this area have entered the stage A of diagenetic stage and their diagenesis is relatively strong.