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针对砂砾岩体纵向和横向对比难度大、严重制约油气勘探的实际问题,系统总结建立了一套砂砾岩体沉积旋回划分及对比方法。首先在精细砂砾岩体沉积成因模式研究的基础上,建立了“以多沉积作用形成的垂向上有序组合的正旋回沉积体为基本单元、以岩相突变面为沉积旋回界面进行单井沉积旋回划分;以扇缘稳定泥岩为标志层,由扇缘向扇中、扇根进行沉积旋回井间对比”的砂砾岩体旋回划分对比模式。其次在该模式的指导下,总结了利用岩心资料标定成像测井和重构岩性识别曲线进行单井沉积旋回划分,在高分辨率时频分析约束下进行井间地层对比的砂砾岩体旋回划分对比方法。该方法成功应用于济阳坳陷盐家地区沙四段上亚段,将其划分为8个中期旋回,并通过井间地层对比建立了等时地层格架,有利地指导了该区的油气勘探。
In view of the difficulty of longitudinal and horizontal comparison of glutenite body, which seriously restricts the practical problems of oil and gas exploration, a set of sedimentary cycle division and contrast method of glutenite body is systematically established. Firstly, based on the study of the genesis of fine conglomerate body, a vertical well combination of normal cyclic volcanic sediments formed by multi-sedimentation was established as the basic unit. The single-well Sedimentary cycle division; Sedimentary stable mudstone as a marker layer, Fan-fan to fan, fan-root sedimentary biweekly contrast "Gravel body cycle division pattern. Secondly, under the guidance of this model, the paper summarizes the single-well sedimentary cycle using the core data calibration imaging logging and the reconstruction of lithology identification curve, and makes a comparison between the wellbore strata under the restriction of high-resolution time-frequency analysis Divide the comparison method. The method is successfully applied to the Upper Es4 Member of the Shahejie Formation in the Jiyang Depression, and is divided into 8 mid-term cycles. An isochronal stratigraphic framework has been established by comparing the stratigraphic correlations between the wells, which has been helpful to guide the oil and gas exploration.