CHARACTERISTICS AND ANALYSIS OF SUBMARINE SHALLOW GAS AT THE SOUTH YELLOW SEA
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摘要: 通过对南黄海西部某风电场区调查资料的分析，发现大量浅层气，主要表现为连续地层反射波发生间断，反射杂乱，部分地层反射波被屏蔽且延伸到深部地层中，局部地层反射波因声速异常导致下拉，反射高频衰减迅速，分辨率降低等。该区域内未发现断层，浅层气封存较好，推测为生物成因沼气，弥散浅层气埋深最浅约5 m，高压气囊顶部埋深最浅约272 m，地质浅孔钻遇高压气风险小。根据浅层气的特征，对其成因、压力和灾害进行了分析和探讨。Abstract: Marine geological survey data, which was collected from a wind farm, indicates that there is a great quantity of submarine shallow gas in the South Yellow Sea. On seismic profiles, the shallow gas is characterized by various features, such as the sudden interrupt of continuous reflection, random reflection, gas blocks, lower resolution and quick attenuation of high frequency components. No fault has been found in the research area, and thus the submarine shallow gas is well preserved. Data suggests that the gas is a kind of methane biogenetic gas. The depth of the diffuse gas is about 5 m, while the top of high pressure zone is about 272 m. Therefore, a 75 m drilling hole is beyond the high pressure zone. The submarine shallow gas has no risk and impact to submarine engineering programs in the region.
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Key words:
- the South Yellow Sea /
- submarine shallow gas /
- reflection wave /
- mathane biogenentic gas
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