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伊通地堑处于中国东部第三纪裂 谷系向东北延伸的分支，其东侧盆缘 断裂为正断层，西侧为高角度走滑 断层，其旁侧为扇—扇三角 洲楔状体，表明这些断裂控制着沉 积充填。第三系在断陷中厚达 ６０００ｍ ，油气勘探中已识别出一系 列不同级别的间断面及构造反转 事件，根据大的区域性间断面划分 出 ３ 个构造层序，并进一步划分了三级 和四级层序，在构造层序界面处识别 出了深切谷充填 。在层 序地层格架的基础上重建了沉积体 系域。结合各阶段同生构造的配置 揭示了总体伸展背景下构造体制由 右旋张剪向左旋压剪的转 化，盆地属于转换伸展性质。伸展及走滑两种 机制共同控制了盆地的演化及各阶 段的充填样式—沉积体系的三维配 置。这一研究成 果已作为预测储层和烃源岩分布及 地层岩性圈闭的基础。
The Yitong graben is a branch extending to the northeast of the Tertiary rift system in the eastern part of China. The basin margin fault in the east is a normal fault and the west side is a high-angle strike-slip fault with a fan-fan delta wedge flanking it These faults control sediment filling. The Tertiary was thick in the fault depression of 6000 m. A series of different levels of discontinuities and structural inversion events have been identified in the oil and gas exploration. Three structural sequences were identified according to the large regional discontinuities and further three Level and level 4 sequences, deep valley fill was identified at the tectonic sequence boundaries. The sedimentary system domain was rebuilt based on the sequence stratigraphic framework. Combined with the configuration of symbiotic tectonics at various stages, the transformation of the tectonic system from right-handed to left-handed compression shear under the overall extensional setting is revealed. The basin belongs to the transition-extensional nature. Both stretching and strike-slip mechanisms jointly control the evolution of the basin and the filling patterns at all stages - the three-dimensional configuration of the depositional system. This research result has been used as a basis for predicting the distribution of reservoir and source rocks and stratigraphic lithologic traps.