中文摘要：

大多数去噪方法在去噪的同时会产生假象，导致去噪后的剖面保真度受到破坏。将噪声归结为非均衡噪声和均衡噪声两种类型，采用两步法策略进行噪声衰减，先衰减非均衡噪声，再衰减均衡噪声。针对两种噪声分布情况，建立指示因子NCR和SCR表示常规信噪分离后噪声剖面和信号剖面的可靠性。分析指示因子NCR和SCR对噪声和信号可靠性的指示意义，据此设计自适应噪声反馈系数，将信噪分离后的噪声剖面乘以自适应反馈系数并加回到信号剖面中，形成一种基于自适应噪声反馈机制的去噪方案。数据测试表明方法具有较好效果。

英文摘要：

Most seismic noise attenuation methods will reduce the data fidelity.A kind of adaptive noise attenuation scheme based on feedback mechanism is introduced in this paper.Noises in seismic data are classified into two categories：unbalanced and balanced noises.Two-step strategy is taken.The unbal-anced noises are attenuated first and then the balanced noises.Two indicators NCR and SCR are estab-lished to denote the reliability of noise and signal section aiming at the two kinds of noises.The meanings of NCR and SCR are analyzed,adaptive noise feedback coefficient is designed based on the two indica-tors,the simultaneous enhancement of signal-to-noise ratio and fidelity is achieved.Tests demonstrate that the method is effective.