柴西南翼山浅油藏上油砂山组颗粒滩相研究

柴达木西部南翼山浅油藏上油砂山组地层的沉积环境是陆相湖泊，发育碎屑岩和陆相湖泊台地沉积。区内发育大量的碳酸盐岩颗粒滩，以颗粒灰（云）岩、藻灰（云）岩和含碎屑泥晶灰岩，其颗粒类型种类较丰富，有砾屑、砂屑、藻团块、鲕粒和球粒等。根据沉积环境强弱的不同，颗粒滩可细分类高能颗粒滩和低能颗粒滩。水动力条件相对较强、结构成熟度和含盐度较高的高能颗粒滩多发育粒间孔、粒间溶孔和溶模孔，是良好储层发育的理想环境。区内的颗粒滩分布特点很明显，纵向上表现为中部发育、下部次之，上部发育较差，平面上则主要集中在西部，东部极不发育。

Research of grain shoal facies of Upper Youshashan Formation of Nanyishan shallow reservoir in west Qaidam Basin

The sedimentary environment of Upper Youshashan Formation,which is developed clastic rock and depoists deposition of continental lake platform facies,is defined as continental lake.There are a mass of carbonatite grain shoals,which mainly consist of grain limestone or dolomite,algal limestone or dolomite,and cryptite with clasolite,which have abundant kinds of grains,such as gravel crumbs,sand debris,algae clumps,and oolitic spherules,etc.According to degrees of sedimentary environment,grain shoals can be s...