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海底电缆双检采集是滩浅海地区地震勘探的重要手段.目前,国内外对双检资料的研究主要集中在鸣震压制方面,而对双检资料中有效波和鸣震的传播规律和陷频特征等研究较少.为了理清有效波和鸣震在水检和陆检中不同响应产生的原因,本文针对海底电缆双检资料开展正演模拟研究,利用二维声波方程的一阶应力—速度方程中的压力和垂向速度分量表示水检和陆检进行正演模拟,并采用自由表面的应力镜像法处理气水边界,形成了双检资料针对性正演模拟技术;分析有效波和鸣震在双检中的波场传播特征,以及不同水深双检资料的陷频规律,为双检资料鸣震压制等处理提供理论依据.
Submarine cable double detection acquisition is an important means of seismic exploration in shallow beach area.At present, the research on double detection data at home and abroad mainly focuses on the suppression of the sonic shock, but the propagation law and the notch frequency Characteristics and so on.In order to sort out the reasons for the different responses of water waves and earthquakes in water and earthquakes, this paper aims at the double-seabed cable submarine survey data to carry out forward modeling research, the use of two-dimensional acoustic equation first-order stress - The pressure and vertical velocity components in the velocity equation represent the forward modeling of water and land surveys, and the free-surface stress-mirror method is used to deal with the gas-water boundary to form a dual-seismographic data-oriented forward modeling technique. The effective wave and The characteristics of the wave propagation in the double check and the frequency-falling regularity of the double check data at different water depths provide a theoretical basis for the processing of the double check data such as the sonic suppression.