摘要
塔中地区志留系主要为无障壁海岸及潮坪沉积体系,其储层以岩屑砂岩、岩屑石英砂岩为主。通过观察岩心和对薄片、扫描电镜、阴极发光、物性、碳酸盐含量等大量资料的研究,认为塔中地区志留系储层砂岩经历了压实作用、胶结作用、交代作用和溶解作用等多种成岩作用,目前已达到晚成岩A2期。孔隙演化与该区的成岩作用关系密切,特别是次生孔隙的发育。孔隙演化经历了原生孔隙的破坏、次生孔隙的形成和次生孔隙的破坏3个阶段,其中机械压实作用和胶结作用是原生孔隙损失的主要原因,溶蚀作用产生的次生孔隙是重要的储集空间。
Silurian system in Tazhong area of Tarim basin is mainly a set of non-barrier coastal and tidal-flat depositional system,and the reservoirs in it consist of lithic sandstone and lithic quartzose sand-stone.Various data from core analysis,thin-section analysis,SEM,cathodoluminescence,physical properties,carbonate content and so on,show that the sandstone of Silurian went through compaction,cementation,metasomatism and dissolution,and the diagenetic evolution of the sandstone is grouped under late diagenetic stage(stage A_(2)).Porosity is closely related with the diagenesis,especially the development of secondary pores.Porosity evolution has experienced destruction of primary pores and construction and destruction of secondary pores.Mechanical compaction and cementation are the main causes for primary pores loss,and secondary pores that generated from dissolution are important reservoir space.
出处
《海洋地质动态》
2006年第5期20-24,共5页
Marine Geology Letters
