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通过岩心观察、薄片鉴定、扫描电镜分析和压汞资料分析等方法,对东营凹陷西部沙四段上亚段滩坝砂体储集空间特征、孔隙结构特征及控制因素进行了系统的研究。其储集空间分为孔隙和裂缝2种类型,其中,原生孔隙主要为压实残余孔隙和胶结残余孔隙,次生孔隙主要为粒间溶解孔隙,裂缝以构造裂缝为主。孔隙结构主要受成岩作用的影响,埋深小于2700m、处于早成岩阶段的滩坝砂体储集空间主要为原生孔隙,孔隙结构主要为高孔高渗透粗喉型和中高孔中高渗透中喉型;埋深为2700~3500m、处于中成岩A期的滩坝砂体储集空间主要为次生溶解孔隙,孔隙结构以中高孔中高渗透中喉型和中低孔中低渗透中细喉型为主。
By means of core observation, thin slice identification, scanning electron microscopy and mercury intrusion data analysis, the reservoir space characteristics, pore structure characteristics and controlling factors of the sand bar body of the Upper Shahejie Formation in the west of Dongying Depression are studied systematically. The reservoir space is divided into two types of pores and fractures. Among them, the primary pores are the compaction residual pores and the cement residual pores, the secondary pores are mainly intergranular dissolved pores, and the fractures are dominated by structural fractures. The pore structure is mainly affected by diagenesis, and the burial depth is less than 2700m. The reservoir space of the beach-dam sand bodies in the early diagenetic stage is mainly the primary pores, and the pore structure is mainly the high-porosity and high-permeability middle-high permeability middle-throat type ; The buried depth is 2700 ~ 3500m. The reservoir space of the beach-bar sand body in the middle diagenetic stage A is mainly secondary dissolved pores. The pore structure is characterized by medium-high porosity middle-high permeability middle-throat type and medium-low porosity middle- the Lord.