渤海海域浅层气分布及地震特征分析

Distribution and Seismic Reflection Characteristics of Shallow Gas in Bohai Sea

海底浅层气严重影响海底地层的结构稳定性,因此成为近海海洋工程的重要安全因素。近年来,通过地震手段在渤海海域发现了多处疑似浅层气区域。该区域中的浅层气蕴藏在海底以下地层或通过断层从地层溢出到海水中。本文在渤海海域高分辨率地震勘探等物探调查资料基础上,分析了渤海海域浅层气地震反射特征。通过查阅相关资料,总结渤海海域浅层气的一般成因。在将已发现的渤海海域浅层气分布区域进行总结并绘制分布图的同时,结合了渤海地质演化以及沉积历史,推测了渤海浅层气集中分布区域的成因。最后讨论了浅层气对近海海洋工程的严重危害。本文所研究的渤海海域海底浅层气分布情况可以为渤海海域海洋工程建设提供重要参考。

Due to the great destructive effect to the stability of the submarine strata,shallow seabed gas has become an important factor seriously impacting on coastal ocean engineering.In recent years,several suspected shallow gas zones have been found in Bohai Sea by means of seismic.Based on the data of the shallow seismic profile and high resolution multichannel seismic exploration,the acoustic reflection characteristics of shallow gas in Bohai Sea are analysed.Through consulting relevant data,the general theory of the shallow gas generation is summarized,and the effect of shallow gas in offshore Marine engineering is discussed.This paper describes the distribution of shallow gas area which have been found in Bohai Sea,and maps at the same time.Combined with the geological evolution of Bohai Sea and the sedimentary history in Bohai Sea,this paper speculates the cause of shallow gas in the concentration distribution area.The serious damage caused by shallow gas is discussed in the end and the results could provide an important reference for marine engineering construction in Bohai Sea.