珠海南部某海域浅层气地震反射特征研究  

Study on seismic reflection characteristics of shallow gas in a sea area in southern Zhuhai

作　　者：段晓旭 段军 张翔翔 林振文 DUAN Xiaoxu;DUAN Jun;ZHANG Xiangxiang;LIN Zhenwen(Guangdong Marine Geological Survey,Guangzhou 510080,China;Technical Monitoring Center of Petroleum Engineering Technology Research Institute of Henan Oilfield Branch,Nanyang 473132,China)

机构地区：[1]广东省海洋地质调查院,广东广州510080 [2]河南油田分公司石油工程技术研究院技术监测中心,河南南阳473132

出　　处：《黑龙江环境通报》2023年第1期40-43,共4页Heilongjiang Environmental Journal

基　　金：广东省地质勘查与城市地质专项,编号:﹝2020﹞-13。

摘　　要：海底浅层气是一种典型的海底地质现象,是诱发海底地质灾害的重要因素,它的存在改变了周围地层的岩土物理性质,使上伏土层强度降低,稳定性破坏,压实能力减小。当有外力介入时,气体易发生偏移,海底含气土层会发生明显沉降,上部地层可能出现塌陷,致使海底建筑物倾斜倒塌,严重影响海上工程的施工安全。通过单道地震测量方法,对珠海南部某海域开展浅地层剖面探究,了解区内浅层气地震反射特征及分布情况。区内海底地层剖面上浅层气地震反射特征主要表现为声学空白、声学幕和不规则强反射界面几种。不同的地震反射特征代表着浅层气在地层中不同的富集状态。Submarine shallow gas is a typical subsea geological phenomenon and an important factor that induces subsea geological disasters. Its existence changes the petrophysical properties of the surrounding strata, reduces the strength of the overburden soil, destroys the stability, and reduces the compaction capacity. When an external force is involved, the gas is prone to drift, the subsea gas-bearing soil layer will subside significantly, and the upper strata may collapse, causing the subsea buildings to tilt and collapse, which seriously affects the construction safety of offshore projects. Therefore, it is essential to understand the distribution and shape of shallow gas around the offshore engineering area. Through the single-channel seismic measurement method, a shallow stratigraphic profile was explored in a sea area in the south of Zhuhai, and the seismic reflection characteristics and distribution of shallow gas in the area were understood. The seismic reflection characteristics of shallow gas on the submarine stratigraphic section in the area are mainly characterized by acoustic blank, acoustic curtain and irregular strong reflection interface. Different seismic reflection characteristics represent different enrichment states of shallow gas in the formation.

关 键 词：浅层气 地震反射特征 声学空白 声学幕 不规则强反射界面 

分 类 号：P738.4[天文地球—海洋地质]