塔里木盆地孔雀河斜坡志留系致密砂岩储层特征及主控因素

综合利用岩心、薄片、铸体薄片、扫描电镜和物性分析等资料，对塔里木盆地孔雀河斜坡志留系储层特征进行了总结，从碎屑组分、沉积和成岩等多方面分析了储层发育的主控因素。研究结果表明:研究区志留系储层的岩石类型以岩屑砂岩、长石岩屑砂岩为主，结构成熟度中等，成分成熟度较低。物性总体较差，属于低孔—特低孔、特低渗的致密砂岩储层，储集空间主要为粒间溶孔、粒内溶孔和微裂缝，孔喉连通性差。沉积作用是控制志留系砂岩储层形成的基础；强烈的压实作用和普遍的胶结作用是致密砂岩储层形成的关键因素；构造破碎作用和溶蚀作用是形成储层次生孔隙的重要因素。 

Characteristics and main controlling factors of tight sandstone reservoirs in Silurian of Kongquehe slope,Tarim Basin

The sandstone reservoir characteristics such as clastic component, sedimentation, diagenesis and so on in the Silurian of Kongquehe slope were analyzed based on the data of core, casting film, electron microscope scanning and reservoir property analysis to determine the main controlling factors of reservoir quality. The research result shows that reservoir lithology is mainly lithic sandstone and feldspathic litharenite, which have medium texture maturity and lower maturity composition. Reservoir accumulation properties are worse, which belong to low-porosity and extra-low-permeability tight sandstone reservoirs. Main reservoir space is corrosion pore between grains or in grains and a few micro-fractures. The connectivity between pore space and throat is poor. Sedimentation is the fundamental factor for the development of sandstone reservoirs in Silurian. Strong compaction and widespread cementation are the dominant factors. Structure fracturing and dissolution are also important factors for the formation of secondary pores in sandstone reservoirs.