东营凹陷现河地区沙三段下亚段储层成岩作用

东营凹陷现河地区沙三段下亚段发育湖泊相、三角洲相和浊积扇相等成因类型的砂体，地层埋藏深度变化大，成岩作用复杂。通过钻井取心、岩石薄片和扫描电镜观察等手段，研究了该区成岩作用。研究结果表明，压实作用、胶结作用、交代作用以及多期次的溶解作用是储层的主要成岩作用。其中，压实作用和胶结作用使储层原始孔隙损失较大。自晚成岩A期到晚成岩B期，因有机质成熟过程、粘土矿物转化、烃类与硫酸盐矿物的热化学氧化还原反应等造成的酸性地层水介质，使次生孔隙发育。

Diagenesis of the low third member of the Shahejie Formation in Xianhe area of Dongying Depression

Many genetic types of sandbodies of the facies of lake,delta and turbidite fan developed in low third member of the Shahejie Formation in Xianhe area of Dongying Depression.Diagenesis is ver-y complex because of the deep buried depth.Based on the measurements of drilling,coring,core wafer and scanning electron microscope,the diagenesis is researched in the studied area.The results indicate that compaction,cementation,metasomatism and multi-period-times dissolution were the main diageneses of the reservoirs.In all of them,the compaction and cementation are the main factors to decreasing stratum porosity and permeability.From late diagenesis A period to late diagenesis B period,acid formation water makes the secondary pores develop,which was caused by the organic matter maturation,clay minerals transformation and thermo-chemistry oxidation deoxidation reactions between hydrocarbon and sulphate minerals.