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通过大量铸体薄片、物性资料、压汞资料分析,从岩石学、成岩作用、物性、孔隙结构等方面对洛川区长6储层进行深入研究,并作出相关评价。结果表明,三角洲前缘亚相沉积的长6储层的岩石学特征具有典型的高结构成熟度,低成分成熟度。并将储层岩石类型、成岩作用、储层物性、砂体厚度、微观孔隙结构及毛细管压力曲线特征综合分析,同时结合鄂尔多斯盆地中生界碎屑岩储集层的分类评价标准,将特低孔~特低渗的长6储层细分为Ⅳa、Ⅳb、Ⅴ三类。
Based on the analysis of a large number of thin castings, physical properties and mercury intrusion data, the author made an in-depth study of the Chang 6 reservoir in Luochuan from aspects of petrology, diagenesis, physical properties and pore structure, and made relevant evaluations. The results show that the petrological characteristics of the Chang 6 reservoir deposited in the delta front has typical high structural maturity and low composition maturity. Based on the comprehensive analysis of reservoir rock types, diagenesis, reservoir physical properties, sand body thickness, microscopic pore structure and capillary pressure curve characteristics, combined with the classification evaluation criteria of the Mesozoic clastic reservoirs in the Ordos Basin, Chang 6 wells of ultra-low permeability are subdivided into Ⅳa, Ⅳb and Ⅴ.