DEVELOPMENT CHARACTERISTICS OF GAS CHIMNEY AND ITS EFFECT ON FORMATION AND DISTRIBUTION OF NATURAL GAS HYDRATE IN THE QIONGDONGNAN AREA, NORTHERN SOUTH CHINA SEA
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摘要:
琼东南海域地震资料解释发现了BSR(似海底反射)、BSR下伏强反射及烟囱体等天然气水合物的地震响应特征。研究发现,区内气烟囱的分布与BSR的分布存在明显的相关性,气烟囱是气体垂直运移的主要通道,气体垂直向上运移至水合物稳定带大量聚集,从而形成水合物。因此,精细刻画研究区气烟囱发育特征对于区内天然气水合物成藏及分布研究具有重要意义。传统气烟囱识别方法只通过地震剖面上的弱反射或相关属性分析,笔者利用基于MLP算法的神经网络,高效地分析了本区域气烟囱的分布,并根据烟囱与BSR分布之间的关系,分析了气烟囱对天然气水合物形成及分布的影响。
Abstract:Seismic indicators of gas hydrate, such as the BSR (Bottom Simulating Reflector), bright reflector under BSR and chimney, have been found in the Qiongdongnan area by seismic survey. There is significant correlation between the development of chimney and the distribution of BSR. Chimney is the main pathway for natural gas to migrate vertically to the HSZ (Hydrate Stability Zone), which offers favorable conditions for massive gas accumulation. Therefore, it is very important to reveal the development characteristics of gas chimneys in order to study of the accumulation and distribution of gas hydrate in the area. Differ from the traditional method to recognize gas chimney with seismic data based on columnar shape, weak reflection and other related attributes, this paper comprehensively studied the development characteristics of gas hydrate by neural network analysis technology and the correlation between gas chimney and the BSR.
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Key words:
- Qiongdongnan area /
- gas chimney /
- gas hydrate accumulation
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图 3 气烟囱与麻坑及丘状体(据文献[7])
Figure 3.
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