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河流深槽沉积体是河流沉积的一种特殊沉积体。辽河坳陷第三纪断裂活动强烈，火山岩广泛分布，形成了独特的地貌条件，具备形成河流深槽沉积体的地质条件。本文以辽河坳陷东部凹陷大２５井区为例，对河流深槽沉积体的成因及特征进行探讨，证实了大２５井区巨厚砂砾岩沉积是河流在火山岩古地形的限制下发生急转弯，在其变曲河段的深槽中沉积的深槽沉积体。该沉积体中发育良好的储集空间，有利于油气储集。该类储集体的发现，丰富了辽河坳陷的储层类型，为油气勘探提供了新的领域。
River deep groove sediment is a special deposit of river sediments. The Tertiary faults in the Liaohe Depression have a strong activity and volcanic rocks are widely distributed, forming unique geomorphological conditions with the geological conditions for the formation of deep-channel sediments in rivers. In this paper, taking D25 zone in the eastern depression of Liaohe Depression as an example, the genesis and characteristics of the deep channel sediments in the river are discussed. It is confirmed that the gigantous glutenite deposits in the Great L5 well are sharp turns under the restriction of the ancient terrain of the volcanic rocks , Deep-trough sediments deposited in deep troughs in the meandering reach. The well-developed reservoir space is conducive to hydrocarbon accumulation. The discovery of such reservoirs enriches the reservoir types in the Liaohe Depression and provides a new field for oil and gas exploration.