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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
In order to find out the acoustic characteristics of the surface seafloor superficial seafloor in the investigation area of the northern South Yellow Sea Basin depression and to analyze the relationship between natural gas seepage and structure and provide reference for the selection of geochemical sampling stations and exploration of oil and gas, A full coverage of side-scan sonar and high-resolution seismic methods were used to investigate the submarine oil and gas leakage in the survey area for the first time. On the side-scan sonar image after the mosaic, the strong reflection patches scattered in the form of stripes are the Ma Hang and the submarine dome landscape. In the seismic section, the characteristics of enhanced amplitude, columnar perturbation, transom and blank reflection can be seen due to gas accumulation. The analysis results show that the widely developed faults near or directly to the seafloor provide channels and gas sources for the seepage of oil and gas. The accumulation and leakage of shallow-surface gas in the sea floor are the result of upward migration of pore fluid in the deep strata, Still in the stage of micro-leakage. Figure 7 Reference 10