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通过孔隙度、脉冲渗透率、全岩X-射线衍射、扫描电镜等实验手段,对延长组长7段陆相泥页岩储层特征进行了研究。实验分析表明,陆相泥页岩储层具有低孔低渗特征,有机质丰度高,但有机质演化程度低,有机质孔隙不发育。黏土矿物含量高,以伊/蒙混层为主,伊/蒙混层间层比为15%。储集空间以微孔隙和微裂缝为主。储集物性与石英含量正相关。泥页岩储层中高的黏土矿物是造成储层物性差的重要原因,因此石英含量尤为重要,不仅有利于增加储集空间,也有利于储层压裂改造。
Through the experiment of porosity, pulse permeability, whole rock X-ray diffraction and scanning electron microscopy, the characteristics of the continental shale reservoirs in Chang 7 Member of Yanchang Formation were studied. Experimental results show that the continental shale reservoirs are characterized by low porosity and low permeability, high organic matter abundance, low organic matter evolution and low porosity of organic matter. Clay mineral content is high, with Iraq / Mongolia mixed layer, Iraq / Mongolian mixed layer ratio of 15%. The reservoir space is dominated by micropores and microcracks. Reservoir properties correlate positively with quartz content. High clay minerals in shale reservoirs are the important reasons for poor reservoir properties. Therefore, quartz content is particularly important, which not only helps to increase reservoir space but also facilitates reservoir fracturing.