论文部分内容阅读
通过岩心观察、测井及各类分析测试资料,对子长油田枣湾区长4+5、长6储层流体性质与油水分布控制因素进行了研究。结果表明:长4+5、长6砂岩主要为细-中粒长石砂岩。碎屑成分以长石为主,其次为石英、岩屑和云母。岩石致密程度深,碎屑颗粒主要呈次圆-次棱角状,分选程度中等~好,接触关系以线状接触为主,胶结类型以孔隙式胶结为主;长4+5、长6孔隙度平均8.32%,渗透率平均0.62×10~(-3)μm~2,属于典型的低孔-低渗储层;长4+5、长6原油具低密度、低粘度、低凝固点、微含硫等特点且具有较好的流动性,属于正常的原油;长4+5、长6地层水为弱酸性,水型为CaCl_2型水;长4+5、长6储层油水混储,纵向分异较差,油水分布受沉积相、微观孔隙结构、岩性、裂缝与物性、低鼻状构造等多重因素的控制。
Through the observation of cores, well logging and various kinds of analysis and test data, the fluid properties and oil-water distribution control factors of 4 + 5 and 6 reservoir in Zaowan area of Zichang oilfield were studied. The results show that the Chang 4 + 5 and Chang 6 sandstones are mainly fine-medium-grained feldspathic sandstones. Fragment composition to feldspar, followed by quartz, cuttings and mica. The rock densities are deep, and the detrital grains are mainly sub-round-angular, with medium to good sorting degree. The contact is mainly linear contact, and the cementation type is mainly cemented by pore. The length is 4 + 5 and the length is 6 Averaged 8.32% and permeability averaged 0.62 × 10 ~ (-3) μm ~ 2, which belonged to typical low-porosity and low-permeability reservoirs. The length of 4 + 5 and 6-long crude oil was low density, low viscosity and low freezing point. Sulfur and other characteristics and has good fluidity, are normal crude oil; long 4 +5, Chang 6 formation water is weakly acidic, water type CaCl 2 -type water; Chang 4 +5, Chang 6 reservoir oil and water mixing, Longitudinal differentiation is poor, and oil-water distribution is controlled by multiple factors such as sedimentary facies, microscopic pore structure, lithology, fissures and properties, and low nose structure.