沙特鲁卜哈里盆地Unayzah组砂岩储层特征

沙特鲁卜哈里盆地Unayzah组是中东地区重要的含油气层位，野外地质调查研究和钻井地质研究的结果表明，Unayzah组的沉积环境是在干旱条件下沉积的风成沙丘、干盐湖、季节性辫状河流以及风化壳。由于Unayzah组砂岩中石英含量比较高，岩石类型主要为石英砂岩，成岩作用较为简单，成岩作用对储层的改造和影响比较小。储集空间类型主要为粒间孔隙。Unayzah组是鲁卜哈里盆地油气勘探的主要目的层。

Characteristics of Sandstone Reservoirs in Unayzah Formation in Rub Al Khali Basin Saudi Arabia

Unayzah Formation is one of the most important exploration target in Rub Al Khali Basin Saudi Arabia. The depositional facies analysis based on the studies of field investigation and well cores and thin section research shows the dune, seasonal river, playa and paleosol environments. The rocks are mainly quartzite which has the high porosity and fair permeability. The sandstone diagenesis of Unayzah Formation has experienced the mechanic infiltration, concreation, dissolution, cementation and compaction. The diagenesis has relatively less influenced the quality of sandstone reservoirs because of the weak compaction and cementation. The pore types are mainly intergranular pores maintainning the good reservoir space.