吴起长8储层粘土矿物及敏感性实验研究

发布时间：2018-09-01 20:01

【摘要】：运用实验方法评价鄂尔多斯盆地中部吴起地区长8超低渗透砂岩储层的粘土矿物组成及对应的潜在储层伤害机理。采用铸体薄片、扫描电镜、X射线衍射等岩心分析技术,掌握了粘土的成分、含量等特征;通过25块岩心的流动评价实验,评价5口油井的储层敏感性特征;运用相关性评价方法,分析粘土矿物对储层物性和敏感性的影响。研究结果表明,吴起长8储层存在的4种主要粘土矿物中,伊/蒙混层含量最高,平均为47%;高岭石、伊利石和绿泥石其次,平均含量分别为24.6%、14.6%和13.8%;粘土矿物的类型、含量和产状对储层物性有重要影响,储层物性与绿泥石含量呈正相关,与伊利石、伊/蒙混层含量呈负相关;由于每种粘土的形态、性质、含量的差异,造成吴起长8储层的弱-中等偏弱速敏、中等偏强-强水敏、强-极强盐敏、弱-中等偏弱酸敏、弱-中等偏弱碱敏的趋势。
[Abstract]:The clay mineral composition of Chang8 ultra-low permeability sandstone reservoir in Wuqi area of central Ordos Basin and the corresponding potential reservoir damage mechanism are evaluated by experimental method. The characteristics of clay composition and content are grasped by core analysis techniques such as casting thin slice, scanning electron microscope and X-ray diffraction, and the reservoir sensitivity characteristics of 5 wells are evaluated by flow evaluation experiment of 25 cores. The influence of clay minerals on reservoir physical properties and sensitivity is analyzed by means of correlation evaluation method. The results show that, of the four major clay minerals in Wuqichang 8 reservoir, the content of Iraq / Mongolia mixed layer is the highest, with an average of 47cm, and kaolinite, Illite and chlorite are the next, with an average content of 24.6B 14.6% and 13.8g, respectively; the types of clay minerals, Content and occurrence have an important influence on reservoir physical property, reservoir physical property is positively correlated with chlorite content, and negatively correlated with Illite content, and is negatively correlated with the content of Illite and / or mixed layer, due to the difference of the morphology, properties and content of each kind of clay. The trend of weak to medium weak velocity sensitivity, medium strong water sensitivity, strong to very strong salt sensitivity, weak to moderate partial weak acid sensitivity and weak to moderate partial weak base sensitivity of Wuqichang 8 reservoir.
【作者单位】：中国石油大学(北京)石油工程教育部重点实验室;中国石油天然气股份有限公司长庆油田分公司;
【分类号】：P618.13

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