【摘要】 利用X射线衍射、红外光谱、扫描电镜等分析资料对东营凹陷郑家王庄地区沙河街组粘土矿物特征及其对储层的伤害进行了研究。结果表明,郑家王庄地区沙河街组碎屑岩储层中粘土矿物类型主要为伊利石/蒙皂石无序间层矿物和高岭石矿物,含少量的伊利石和微量的绿泥石矿物。依据蒙皂石层层间阳离子类型,伊利石/蒙皂石无序间层矿物可进一步分为钙型、钠型和钙钠过渡型3种类型。高岭石矿物有结晶度高、形态发育良好和结晶度低、形态发育差两种类型,据此得出高岭石有自生成因和陆源碎屑成因两种类型。粘土矿物的膨胀率及水敏感性实验分析表明,钠型伊利石/蒙皂石无序间层矿物具有更大的膨胀性,对储层损害最大,钙钠过渡型次之,钙型最小。对储层中高岭石含量与储层物性分析发现,两种成因的高岭石对储层物性影响截然不同,自生高岭石的大量存在能有效改善本区储层物性,陆源碎屑高岭石则使储层物性变差。更多还原

【Abstract】 According to the analysis of X-ray diffraction,infrared ray spectrum and scanning electron microscope,clay mineral characteristics and its damage to formation were studied for Shahejie group of Zhengjia-Wangzhuang areas,Dongying depression.The results show clastic reservoir of the area mainly consists of kaolinite and randomly interstratified illite/montmorillonites(S/I).Still, illite and chlorite exist in small amount.Based on cation type in the interlays,S/I can be subdivided into three kinds: calcium type,natrium type and their mixture type.Kaolinite develops two different kinds: high cristallinity and low cristallinity.The former exhibits regular morphological habits,and the latter exhibits irregular ones.According to morphological characteristics,kaolinite includes two kinds of origins: authigenic kaolinite and allogenic one.The analysis of clay minerals swelling capability and water-sensitivity shows that mixture type S/Is swelling capability is more than calcium types,less than natriums.Natrium type S/I has the biggest swelling capability and does the heaviest damage to the formation.The analysis of kaolinite content and physical property indicates that different origins kaolinite has absolutely different effects on reservoir physics.Authigenic one can improve reservoir physics effectively,while allogenic one has negative influence on reservoir physics in the areas.更多还原