【摘要】 青海东部气田属第四系气藏，成岩性差，岩层间以泥质胶结为主。台南５ 井岩石Ｘ 射线衍射分析表明粘土含量２０％ ～３０％ ，以绿泥石、伊利石为主；薄片鉴定结果为：碎屑部分占７５ ％ ，胶结部分占２５ ％ ，胶结类型为充填—孔隙式胶结。通过室内化学酸敏实验，选用合适酸浓度范围为ＨＣｌ７－５％ ～１０％ ，ＨＦ２％ ～４ ％ ，Ｈ３ＰＯ４１０％～１５ ％ 。原子吸收光谱分析残酸离子浓度、铁离子浓度高，达３ ５００ｍｇ／Ｌ～４ ０００ｍｇ／Ｌ，酸化液中需加入防铁离子沉淀剂，以减少对地层渗透率的损害。更多还原

【Abstract】 Qinghai eastern gas field belongs to Quaternary gas reservoirs with poor diagenetic grade.Main formation cementation is muddy cementation.According to X-ray diffraction analysis,the cores of well Tainan 5 contain 20%～30% clay,mainly chlorite and grundite.The results of chip identification show rock has about 75% detritus and 25% cementation material.Cementation type is pack-pore cementation.Through acid sensitivity analysis,it is found suitable acid concentration is HCl 7 5%～10%,HF2%～4%,H 3PO 4 10%～15%.The ions content in residue acid are determined by atomic absorption spectrometry.The results show F e 2+、3+ concentration in residue acid arrives 3500～4000mg/L. Anti-precipitation agent for F e 2+、3+ can decrease damage to formation permeability.更多还原