珠江口盆地东部番禺低隆起是有利油气富集区带，诸多构造圈闭的浅部天然气(即浅层气)异常发育，且气层厚度多变，对下伏的构造圈闭及气层深度影响颇大，也极大地影响了深部主力气层深度、厚度及气藏展布规模的时深转换精度。针对研究区气藏的具体特点，从浅层气形成机制、模型正演和地震剖面特征上识别了浅层气，并通过时间校正法来消除其对深部构造圈闭、气藏规模和气层有关参数的影响，结果表明，该方法在研究区的时深转换中是经济有效的。

The Panyu low uplift of Pearl River Mouth Basin is a favorable accumulation area of hydrocarbon. Many structures have shallow gas with changeable thickness. This influences the time depth conversion of the major gas pools deep below greatly. According to the characteristics of gas pools, this paper analyses shallow gas from its formation mechanism, forward modeling and seismic section characteristics, and then eliminates the influence of shallow gas by time correction method. This method is economical and valid in practice.