杭州湾海域海管路由区浅层气分布特征研究

作为一种地质灾害，浅部地层中浅层气发育会对海底管道稳定性产生长期且隐蔽的不利影响，为确保海管安全运行，有必要查明浅层气分布特征与发育程度。采用中-浅地层剖面探测方法，研究了杭州湾海区北侧和南侧岛屿区辅设的海管路由区浅层气状况。北侧海管浅层气主要分布于南北两岸登陆段附近，气顶埋深浅，呈弥散、浸染状分布；南侧岛屿区海管浅层气分布范围广，且连续成片，气顶埋深较浅。在不同的沉积环境和海流冲刷作用下，浅层气可能造成海管祼露、海管之下地层承载力下降而产生剪切破坏等结果。

As a geological disaster, the development of shallow gas in shallow strata will have a long-term and hidden adverse impact on the stability of submarine pipelines. In order to ensure the safe operation of submarine pipelines, it is necessary to find out the distribution characteristics and development degree of shallow gas. The shallow gas situation in the submarine pipeline routing area in the north and south island areas of Hangzhou Bay was studied by using the method of middle-shallow stratum profile detection. The shallow gas in the north side of the submarine pipeline is mainly distributed near the landing sections of the north and south banks, and the gas cap is buried in a shallow depth, which is dispersed and disseminated. The shallow gas of the submarine pipeline in the south island area is widely distributed and continuous, and the buried depth of the gas cap is shallow. Under different sedimentary environments and different current erosion actions, shallow gas may cause the sea pipe to be exposed and the bearing capacity of the stratum under the sea pipe to decrease, resulting in shear failure.