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通过偏光显微镜、荧光显微镜、阴极发光显微镜、场发射电镜和物性实验等手段,系统剖析了束鹿凹陷沙河街组三段下亚段泥灰岩-砾岩储层储集空间类型,探讨了储集空间成因及控制因素。研究区泥灰岩-砾岩主要发育纹层状泥灰岩、块状泥灰岩、颗粒支撑陆源砾岩、杂基支撑陆源砾岩、混源砾岩5种岩性,储层致密,孔渗极差,属特低孔特低渗储层。储集空间主要为次生孔隙和裂缝,发育溶孔、有机质孔、砾内孔、粒(晶)内孔隙、粒(晶)间孔隙等,以及构造缝、层间页理缝、贴砾缝、收缩缝、有机酸溶蚀缝等;其中,泥灰岩储集空间以有机质孔隙、页理缝、粒(晶)间孔隙为主,砾岩储集空间以砾内孔、溶孔、构造缝为主。储集空间的发育主要受构造作用、沉积作用、物源和成岩作用等因素综合影响。
The types of reservoir space for the marl-conglomerate reservoir in the lower section of Shahejie Formation in Shulu Sag are systematically analyzed by means of polarization microscope, fluorescence microscope, cathodoluminescence microscope, field emission electron microscope and physical experiment. Set space causes and control factors. The marl-conglomerate in the study area is mainly composed of lamina-like marl, massive marl, grain-supported terrigenous conglomerate, miscellaneous-supported terrigenous conglomerate and mixed conglomerate with five types of lithology, dense reservoirs, Infiltration of poor, is a special low-permeability ultra-low permeability reservoir. The reservoir space is mainly composed of secondary pores and fractures, dissolved pores, organic pores, gravel pores, intragranular pores and intergranular pores, as well as structural seams, intergranular pavement seams, gravel gravels , Shrinkage cracks and organic acid dissolution cracks. Among them, the reservoirs of the marl are dominated by pores of organic matter, pore-for-pore and intergranular (intergranular), conglomerate pore space, dissolved pores and structural seams Mainly. The development of reservoir space is mainly affected by the tectonism, sedimentation, provenance and diagenesis.