文东油田沙三中油层储层特征研究

为了提高沙三中油层开发水平，并为各种作业措施提供地质依据，通过各种分析测试方法，对沙三中油层储层特性做了详细研究．结果表明：沙三中油层储层砂岩以粉砂岩和粉细砂岩为主，储层矿物成分成熟度较低，不稳定组分含量很高，碎屑矿物成分主要有石英、长石、喷出岩、复 晶石英、硅质、泥质和云质；岩石化学成分中 Ｃａ２＋ 、 Ｍ ｇ２＋ 含量较高，决定了地层水高矿化度和高 Ｃａ２＋ 、 Ｍ ｇ２＋ 含量．铸体薄片观察证明储层砂岩属小孔细喉型，孔隙形态不规则、喉道曲折复杂；粘土矿物主要有伊利石、高岭石、绿泥石和伊 ／ 蒙混层矿物，其产状以薄膜式和分散充填式为主；成岩作用主要有压实作用、胶结及交代作用和溶蚀作用等三种类型．储层有潜在的水敏、速敏、酸敏和无机垢损害存在．

The Reservoir Characteristics of Shasanzhong Oil bearing Reservoir in Wendong Oil Field

The reservoir characteristics of Shasanzhong oil bearing reservoir are studied in detail by various measuring methods. It is shown that the reservoir sandstone is mainly composed of siltstone and silt fine sand, the maturity of its mineralogical composition is low due to the high content of unstable components;the main detrital components are quartz, feldspar, effusive rock, polyquartz, silicon, shale and mica; the salinity and Ca 2+ 、Mg 2+ content of the formation water are high because there is a large quantity of Ca 2+ ,Mg 2+ in the rock. By observing slices, it is verified that the pore shape of the reservoir sandstone is irregular, the pore path is winding, the pore throat is narrow; the principal components of clay mineral are illite, kaolinite, chlorite and illite/smectite mixed layer, their occurrence is filmy and dispersed packing;diagenesis includes compaction, cementation and metasomatosis, and corrosion. There are potential formation damages such as water sensitivity, velocity sensitivity, acid sensitivity and inorganie scale deposit in the reservoir. Subject headings: reservoir, pore structure, clay mineral, reservoir characteristics, diagenesis, Wendong Oil Field