徐家围子断陷沙河子组储层特征研究

Reservoir Characteristics of Shahezi Group Xujiaweizi Fault Depression

利用铸体薄片和X射线衍射等方法对徐家围子断陷沙河子组储层进行了分析,确定了其岩性主要以泥质粉砂岩及细砂岩为主,成熟度偏低。通过室内压汞实验分析了沙河子组储层孔隙结构,表明该储层整体表现为孔喉半径小,造成孔隙结构中微观规模的油水分布不均匀,为特低孔、特低渗型储层岩性油藏,储层主要受颗粒粒度及成岩作用等因素控制,溶蚀作用使各类孔隙有效连通,因此,进行储层特征研究及影响因素确定,有利于徐家围子断陷油气的勘探与开发。

Analyzed the reservoir of Xujiaweizi depression Shahezi group using the casting thin sections and X-ray data , determine its lithology mainly argillaceous siltstone and fine sandstone , maturity is low . According to the mercury curve analyzed Shahezi pore structure ,indicating that the overall performance of the reservoir pore throat radius is small ,resulting in micro-scale pore structure water distribution is uneven ,which is the low porosity and low-permeability lithology reservoir .The reservoir is mainly affected by the particle size and diagenesis ,dissolution effectively make all kinds of pores connectivity , therefore ,the research of reservoir characteristics and influencing factors are significant to oil gas exploration and development of Xujiaweizi foult depression .