【摘要】 为了查明Velasquez油田剩余油分布,挖掘剩余油潜力,对研究区的沉积环境、沉积微相及其特征进行研究,建立准确的储集层模型。根据岩芯观察,对构造特征、岩性特征、粒度特征和地震响应特征进行分析。利用均方根振幅属性预测砂体厚度,并以此对沉积微相展布进行分析,讨论沉积微相与剩余油分布的关系。研究结果表明:48-45断块区Guaduas组为一套辫状河三角洲沉积,并划分为辫状河三角洲平原、前缘2个亚相和辫状河道、泛滥平原、水下分流河道、河口坝、席状砂、支流间湾6个微相;Guaduas组沉积时期经历了湖平面升—降—升的演化;研究区油层水淹程度和剩余油分布明显受沉积微相制约,辫状河道和水下分流河道顶部、河口坝侧缘、席状砂砂体沉积区剩余油相对富集,是油田下一步开发调整和剩余油挖潜的主体。更多还原

【Abstract】 To get a proper knowledge of remaining oil distribution and improving oil recovery rate in Velasquez oilfield,the core observation,depositional structure,lithologic,granularity and seismic response characteristics were analyzed.The sedimentary condition,sedimentary micro-facies and their features were studied,and the model of proper reservoir was built.The predict sandbodies’ thickness was predicted using the root-mean-square amplitude,and through it the micro-facies distribution was discussed.The relationship between microfacies and remaining oil distribution was discussed.The results show that the depositional environment of the Guaduas formation in 48-45 fault block belongs to braid delta deposit.The depositional facies include two subfacies(braided river delta plain and braided river delta front) and six micro-facies(braided channel,flood plain,subaqueous distributary channel,mouth bar,sheet sand and interdistributory bay).The lake level has rise-fall-rise during Guaduas formation sedimentary period.Reservoir water flooding degree and remaining oil distribution are controlled by micro-facies.And the remanent oil is relatively concentrated in the top of braided channel and subaqueous distributary channel,the side of mouth bar and sheet sand,which are the major targets of next development adjustment and remaining oil potential tapping.更多还原