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综合应用测井和常规物性、铸体薄片、扫描电镜、X衍射、粒度、压汞等分析化验资料,对南海东部某油田沙河街组沙三段低孔低渗型储集层特征及影响因素进行了分析。分析结果表明:研究区低孔低渗储层具有岩石成分、结构成熟度低的岩石学特征,储集空间有原生孔、次生孔、混合孔及少量胶结物内孔,孔隙结构类型属于小孔隙、微喉道型。沙三段低孔低渗储层成因主要受沉积作用和成岩作用的共同影响。沉积相带在本质上决定了储集层低孔低渗的特性,该类储层主要发育于沙三段近岸水下扇的扇主体、扇根及扇前缘砂体;成岩作用对储层的物性有决定性的影响,压实作用使得储层孔、渗性减小变差,胶结作用进一步恶化了储层的孔、渗性,溶蚀作用在一定程度上扩展了孔隙系统的发育及连通,对储层物性有一定的改善作用。
The characteristics and influential factors of low porosity and permeability reservoir in Shahejie Formation of the eastern South China Sea are analyzed by comprehensively applying well logging and conventional physical properties, casting thin slices, scanning electron microscopy, X - ray diffraction, particle size and mercury intrusion analysis. Analyzed. The results show that the low-porosity and low-permeability reservoirs in the study area have petrological characteristics with low rock composition and low structural maturity. There are primary pores, secondary pores, mixed pores and a small amount of cementite pores in the reservoir space. The pore structure types belong to small Pore, throat type. The formation of low-porosity and low-permeability reservoirs in Es3 is mainly affected by both sedimentation and diagenesis. Sedimentary facies essentially determine the characteristics of low porosity and low permeability of reservoirs. Such reservoirs mainly develop in the fan body, fan base and fan margin sand bodies of the nearshore subaqueous fan in the third member of the Shahejie Formation. Diagenesis The physical properties of the layers have a decisive influence. The compaction makes the porosity and permeability of the reservoir decrease, and the cementation further worsens the porosity, permeability and dissolution of the reservoir to a certain extent, expanding the development and connectivity of the pore system , The reservoir physical properties have a certain role in improving.