莺歌海油气资源开发区工程地质和灾害地质特征
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摘要
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。
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.
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.
引文
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中国科学院海洋研究所 ,中国科学院力学所 ,南海西部公司 .南海西部石油开发区区域性工程地质调查与评价 (报告与附图 ) . 1 989.
国家海洋局第一海洋研究所 .莺西、涠洲海域工程地质区域性综合调查 (报告及附图 ) . 1 995.
中国科学院海洋研究所 ,中国科学院力学研究所 ,南海西部石油公司 .南海莺歌海盆地区域性工程地质调查报告 . 1 986 .
[2] FanFX.ResearchofgeologichazardsintheoildevelopmentareaintheBeibuBayofSouthChinaSea[D].Qingdao:InstituteofOceanology,CAS,1993.范奉鑫.南海北部湾石油开发区灾害地质研究[D].青岛:中国科学院海洋研究所,1993.
[3] FengWK,XuWJandYangDY,LateQuaternaryGeologicEnvironmentsoftheNorthernSouthChinaSea[M].Guangzhou:GuangdongScienceandTechnologyPress,1988.冯文科,薛万俊,杨达源.南海北部晚第四纪地质环境[M].广州:广东科技出版社,1988.
[4] YangMZ,LiangZQ,WangHB,etal.CharacteristicsofmarineengineeringgeologyintheBeibuBay,SouthChinaSea[J].MarineGeology＆QuaternaryGeology,2000,20(4):47 52.杨木壮,梁修权,王洪彬,等.南海北部湾海洋工程地质特征[J].海洋地质与第四纪地质,2000,20(4):47 52.
[5] ChenJYandLiTH.TypesanddistributionsofgeologicalhazardsintheSouthChinaSea[J].ActaGeologicaSinica,1993,67(1):76 85.陈俊仁,李庭桓.南海地质灾害类型与分布规律[J].地质学报,1993,67(1):67 85.
[6] ChenJY.ResearchofpotentialgeologicalhazardsintheSouthChinaSea[A].ProceedingsoftheFifthEngineeringGeologyConference[C].Beijing:SeismicPress,1996.陈俊仁.南海潜在地质灾害因素研究[A].第五届全国工程地质大会文集[C].北京:地震出版社,1996.364
[7] FengZQ,FengWK,XueWJ,etal.MarineGeologicHazardsandEngineeringGeologyConditionsintheNorthernSouthChinaSea[M].Nanjing:HohaiUniversityPress,1996.冯志强,冯文科,薛万俊,等.南海北部地质灾害及海底工程地质条件[M].南京:河海大学出版社,1996.
中国科学院海洋研究所 ,中国科学院力学所 ,南海西部公司 .南海西部石油开发区区域性工程地质调查与评价 (报告与附图 ) . 1 989.
国家海洋局第一海洋研究所 .莺西、涠洲海域工程地质区域性综合调查 (报告及附图 ) . 1 995.
中国科学院海洋研究所 ,中国科学院力学研究所 ,南海西部石油公司 .南海莺歌海盆地区域性工程地质调查报告 . 1 986 .
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