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东营凹陷北部陡坡带位于东营古湖盆的陡岸边缘。在早第三纪,其北岸为一近东西走向的古断剥面,具有坡陡(15°～30°)、沟梁相间的古地貌特征。由于控制东营凹陷沉积的陈南基岩断裂在发育过程中以及次级断层持续后动影响,斜坡上形成了高低不平、宽窄不一的断阶。在这种特殊的构造背景下,沉积地层中各种成因的砂砾岩体(扇体)极为发育,并成为勘探的重要目标。扇体侧向上尖灭在生油深洼陷中,具有比较好的油源条件,同时真成藏条件也极其复杂。近几年由于地质以识程度的不断深化以及新技术的不断应用,使扇体勘探进入一个新的队段,由过去的兼探对象上升为主探目标,并形成了一套针对扇体的勘探技术,特别是针对扇体油气聚集成藏等方面的研究取得了丰硕的成果,这对类似湖盆扇体勘探有重要的参考价值。
The steep slope belt in the northern part of Dongying Sag is located on the steep bank edge of the ancient lake basin in Dongying. In the early Tertiary, its north bank was a paleo-faulted strip with east-west strike, steep slope (15 ° ~ 30 °) and paleogeomorphology between ditch and beam. Due to the influence of the Chennai bedrock fault controlling the sedimentation in the Dongying depression during the development and the sustained and later secondary faults, the slopes are formed with the unevenness and the varying widths. In this special tectonic setting, glutenite bodies (fans) of various origin in sedimentary strata have developed extremely well and have become an important target of exploration. The fan body is pointed up and down in the deep oil-bearing depression and has relatively good oil source conditions. At the same time, the condition of true reservoir formation is also extremely complicated. In recent years, due to the constant deepening degree of geological knowledge and the continuous application of new technologies, fan exploration has entered a new team segment, from the past, the object of exploration to the main exploration goal, and formed a set of fan-oriented Exploration technology, especially for the accumulation of oil and gas fan sector has made fruitful research, which is similar to the lake basin exploration has important reference value.