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利用扫描电镜、铸体薄片等多种方法,对鄂尔多斯盆地镇泾油田长8油层组低孔低渗的致密砂岩储层的储层特征和沉积相进行综合分析研究,发现该地区砂岩类型主要有细粒岩屑长石砂岩和长石岩屑砂岩,孔隙度和渗透率分别为3.9%%~11%和(0.04~0.55)×10-3μm2。研究区主要成岩作用包括压实作用、压溶作用、胶结作用、溶蚀作用、交代作用。通过对镇泾区块沉积储层形成的沉积相的研究,查明该区广泛发育三角洲相,进一步可划分为水下分流河道、水下天然堤、水下决口扇、水下分流间湾、河口坝等5种微相。上述研究为镇径油田长8段储层的研究和预测提供了理论依据。
Based on the comprehensive analysis of reservoir characteristics and sedimentary facies of tight sandstone reservoirs with low porosity and permeability in Chang 8 reservoir of Zhenjing Oilfield, Ordos Basin, the sandstone types in this area are mainly Fine-grained feldspar feldspathic sandstone and feldspathic lithic sandstone have porosity and permeability of 3.9% to 11% and (0.04 to 0.55) × 10-3μm2, respectively. The main diagenesis in the study area includes compaction, pressure solution, cementation, dissolution and replacement. Through the study on the sedimentary facies formed by sedimentary reservoirs in Zhenjing block, it is found that the delta phase is widely developed and can be further divided into underwater distributary channel, underwater natural dike, underwater mouth fan, underwater distributary bay, Estuary dam five kinds of micro-phase. The above research provides a theoretical basis for the research and prediction of reservoir in Chang 8 section of Zhenjing Oilfield.