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为研究利津洼陷沙四上亚段深部砂岩成岩环境,对岩心样品进行偏光、荧光、阴极发光显微镜和扫描电镜观察,辅以粘土矿物含量、元素含量测试.识别出酸性和碱性2种成岩环境,酸性环境以硅质沉淀、碳酸盐矿物溶解、长石溶解或蚀变为高岭石等现象组合为标志,碱性环境以碳酸盐矿物沉淀、长石次生加大、石英溶解等现象组合为标志.总体演化为:同生期,原始沉积流体造成碱性环境;早成岩期,未熟有机质演化形成短期的酸性环境,继承流体形成主体的碱性环境;中成岩A1期(埋深约2700～3200m),有机质成熟形成酸性环境;中成岩A2期(埋深约3200～4200m),深部断裂活动形成碱性环境;中成岩B期(埋深约4200～4400m),第二期充注油气的热演化形成酸性环境.
In order to study the diagenetic environment of sandstone in the upper part of Es4 in Lijin Sag, the core samples were observed by polarized light, fluorescence, cathodoluminescence microscope and scanning electron microscopy, supplemented by clay mineral content and elemental contents, and acid and alkaline diagenesis were identified Environmental and acidic environments are characterized by a combination of siliceous sediments, dissolution of carbonate minerals, dissolution or alteration of feldspar into kaolinite, precipitation of carbonate minerals in alkaline environments, secondary growth of feldspar, and dissolution of quartz Combination as a sign.The overall evolution is: the same period, the original sedimentary fluid caused by the alkaline environment; early diagenetic stage, unripe organic matter evolution to form a short-term acidic environment, the inherited fluid to form the main alkaline environment; 2700 ~ 3200m), the organic matter mature to form acidic environment; middle diagenetic stage A2 (buried depth of about 3200 ~ 4200m), the deep fault activity to form alkaline environment; diagenetic B phase (buried depth of about 4200 ~ 4400m) The thermal evolution of oil and gas forms an acidic environment.