南黄海盆地北部坳陷海底油气渗漏的声学探测
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摘要
为查明南黄海盆地北部坳陷调查区内与海底油气渗漏有关的海底浅表层声学特征,分析天然气渗漏与构造的关系,为下一步地球化学取样站位的选择和油气勘探提供参考,采用全覆盖侧扫声纳和高分辨率地震方法首次对调查区的海底油气渗漏现象进行了调查。在镶嵌处理后的侧扫声纳图像上,呈条带状散布的强反射斑块为麻坑和海底圆丘地貌。在地震剖面上可见由于气体聚集产生的振幅增强、柱状扰动、气窗及空白反射等特征。分析结果表明,广泛发育的接近或直达海底的断层为油气渗漏提供了通道和气源,海底浅表层气体的聚集和渗漏是深部地层中孔隙流体向上运移的结果,且调查区海底目前仍处于微渗漏阶段。图7参10
The full-covered Side-Scan Sonar and high-resolution seismic survey method is initially adopted to research on the seabed hydrocarbon seepage in the survey area,for the purpose of the following: clarifying the shallow acoustic features related to seabed hydrocarbon seepage in the north depression area of South Yellow Sea Basin,analyzing the relations between the seepage and the structure,and providing evidence for selection of geochemistry sampling station and petroleum exploration.On the mosaic image of Side-Scan Sonar,the strong reflecting spots in strip-like distribution present the physiognomy of pockmark and dome.On the seismic profile,we can see the characteristics such as enhanced amplitude,columnar disturbance,gas chimney,and blank reflection,which result from gas accumulation.The analysis results indicate that the widely developed faults which approach or connect to seabed provide the channel and source of hydrocarbon seepage.The accumulation and seepage of subsea shallow-layer gas results from the upward migration of fluids from deep-layer pores,and the sub-sea survey area is still at tiny seepage stage.
The full-covered Side-Scan Sonar and high-resolution seismic survey method is initially adopted to research on the seabed hydrocarbon seepage in the survey area,for the purpose of the following: clarifying the shallow acoustic features related to seabed hydrocarbon seepage in the north depression area of South Yellow Sea Basin,analyzing the relations between the seepage and the structure,and providing evidence for selection of geochemistry sampling station and petroleum exploration.On the mosaic image of Side-Scan Sonar,the strong reflecting spots in strip-like distribution present the physiognomy of pockmark and dome.On the seismic profile,we can see the characteristics such as enhanced amplitude,columnar disturbance,gas chimney,and blank reflection,which result from gas accumulation.The analysis results indicate that the widely developed faults which approach or connect to seabed provide the channel and source of hydrocarbon seepage.The accumulation and seepage of subsea shallow-layer gas results from the upward migration of fluids from deep-layer pores,and the sub-sea survey area is still at tiny seepage stage.
引文
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[5]何家雄,夏斌,刘宝明,等.中国东部及近海陆架盆地CO2成因及运聚规律与控制因素研究[J].石油勘探与开发,2005,32(4):42-49.He Jiaxiong,Xia Bin,Liu Baoming,et al.Origin,migration andaccumulation of CO2in East China and offshore shelf basins[J].Petroleum Exploration and Development,2005,32(4):42-49.
[6]李双林,何拥军,肖菲,等.南黄海北部盆地表层沉积物烃类地球化学探测[J].海洋地质与第四纪地质,2003,23(4):39-44.Li Shuanglin,He Yongjun,Xiao fei,et al.Geochemical explorationfor hydrocarbon in the Northern South Yellow Sea[J].MarineGeology&Quaternary Geology,2003,23(4):39-44.
[7]李小地.中国大油田的分布特征与发现前景[J].石油勘探与开发,2006,33(2):127-130.Li Xiaodi.Distribution characteristics and discovery prospect ofgiant oilfields in China[J].Petroleum Exploration andDevelopment,2006,33(2):127-130.
[8]温珍河,张金川.南黄海盆地找油新方向的探讨[J].海洋地质与第四纪地质,1989,9(2):27-34.Wen Zhenhe,Zhang Jinchuan.A discussion about new directionsfor oil finding in southern Yellow Sea Basin of China[J].MarineGeology&Quaternary Geology,1989,9(2):27-34.
[9]陶瑞明.泰州组上段——南黄海北部盆地北凹的主要生烃层[J].中国海上油气(地质),1993,7(3):11-14.Tao Ruiming.Upper Taizhou formation—the main hydrocarbonsource rock in the Northern Sag of Northern Basin of SouthYellow Sea[J].China Offshore Oil and Gas(Geology),1993,7(3):11-14.
[10]曲希玉,陈建文,徐淑艳,等.南黄海盆地北部坳陷白垩系地震相分析[J].世界地质,2005,24(2):129-136.Qu Xiyu,Chen Jianwen,Xu Shuyan,et al.Cretaceous seismicfacies analysis of Northern South Yellow Sea Basin[J].GlobalGeology,2005,24(2):129-136.
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