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根据钻井取心分析测试、岩石薄片和扫描电镜观察等手段,对南堡凹陷高南地区东营组成岩作用和次生孔隙发育特征进行研究,并在此基础上划分了成岩阶段。研究结果表明,东营组碎屑岩地层经历了强烈的压实作用和胶结作用、复杂的交代作用和多期次的溶蚀作用,原生孔隙大部分被破坏,主要以次生孔隙为主,长石的溶蚀是储层中次生孔隙形成的主要原因。从早成岩B期到中成岩A1期,有机质成熟过程、粘土矿物转化等造成的酸性地层水介质,使东营组碎屑岩储层在纵向上主要发育3个次生孔隙发育带。粘土矿物的结晶、石英次生加大作用及碳酸盐胶结物的沉淀对孔隙度的降低起到了关键性作用。
Based on the drilling coring analysis, rock thin slices and scanning electron microscopy, the diagenesis and secondary pore development of Dongying Formation in Gaonan area of Nanpu sag are studied. Based on this, the diagenetic stage is divided. The results show that the clastic rocks in Dongying Formation experienced strong compaction and cementation, complex metasomatism and multi-stage dissolution. Most of the primary pores were destroyed, mainly secondary porosity, and feldspar The dissolution is the main reason for formation of secondary pores in the reservoir. From the early diagenetic stage B to the middle diagenetic stage A1, the maturation process of organic matter and the conversion of clay minerals resulted in the acidic formation water medium, so that the clastic rock reservoirs of Dongying Formation mainly develop three secondary pore development zones longitudinally. Crystallization of clay minerals, quartz secondary growth and carbonate cement precipitation played a key role in reducing porosity.