莺歌海油气资源开发区工程地质和灾害地质特征

根据单道地震、浅地层剖面、旁扫声纳和海底取样等实测资料，分析和评价了莺歌海油气资源开发区的工程地质和灾害地质环境。研究结果表明，研究区海底地形地貌较为复杂，存在潮流沙脊、侵蚀冲沟、海底沙波、麻坑、埋藏古河道和古湖泊、浅层气、埋藏珊瑚礁和滑塌断层等潜在的灾害地质因素，对海上石油平台和输油管线等工程设施构成直接或潜在的危害。根据地形、地貌和沉积物物理力学特征，将研究区划分为内陆架堆积平原区、陆架潮流沙脊区、内陆架侵蚀平原区、外陆架平原区和大陆坡区5个工程地质区。其中研究区东部的潮流沙脊区和东南部的陆坡区，海底地形复杂，活动性的潮流沙脊和断层发育，是海底工程建设的危险区，应引起高度重视。

Characteristics of Marine Engineering Geology and Hazardous Geology in the Yinggehai Oil and Gas Resource Development Area

Based on the seismic, subbottom profiler and side scan sonar survey data and the seabed sampling data, the analysis and assessment of engineering geology and hazardous geology environments in the Yinggehai oil and gas resource development area were made. It is shown from the study results that the submarine topography and geomorphology in the study area are complex, and there are many geologic hazards, such as tidal sand ridge, scour channel, sand wave, pockmarks, buried channel, buried lake, shallow gas, buried coral reef and slump fault, which will pose direct or potential dangers to the marine engineering installations. Based on the characteristics of topography, geomorphology and sediment physicomechanics, the study area can be divided into 5 engineering geology areas, inner shelf accumulation plain (area), shelf tidal sand ridge area, inner shelf erosion plain area, outer shelf plain area and continental slope (area), among them, the tidal sand ridge area and continental slope area are dangerous areas for submarine engineering installations because the two areas have complex submarine relief, well developed active tidal sand ridges and faults, so attentions should be drawn to these geologic hazards in constructing submarine engineering installations.