Collective fluid flow system and its implications for gas hydrate accumulation in the north slope of the South China Sea
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摘要:
利用台西南盆地三维高精度地震资料，对南海北部陆坡聚集流体活动系统进行了分析和研究。在研究区识别出了断层、气烟囱、泥火山、泥底辟等聚集流体活动系统。研究区聚集流体活动系统主要特征包括：①断层与气烟囱相伴生；②气烟囱发育的区域与似海底反射（BSR）分布区域基本吻合，在气烟囱上方可以识别出一定长度的BSR；③泥底辟/泥火山导致周围和上覆地层形成了大量小尺度断层和微裂隙，中、深部流体可沿破裂带向上运移至天然气水合物稳定带内形成天然气水合物。因此，研究区聚集流体活动系统为天然气水合物发育成藏提供了流体来源，有利于天然气水合物的聚集，对于揭示天然气水合物的富集规律意义重大，能够为其他区域天然气水合物勘探提供借鉴。
Abstract:Based on 3D high-precision seismic data used to analyze the collective fluid flow systems in the Taixinan Basin, a collective fluid flow system including faults, gas chimneys, mud volcano, and mud diapir was identified in the study area.The main characteristics of the collective fluid flow system in the study are manifested as follows: a, association of faults with gas chimneys; b, consistence of the development area of gas chimneys with the distribution area of Bottom Simulating Reflection (BSR), and a certain length of BSR identified above the gas chimney; c, development of a large number of small scale faults and micro-fissures in the surrounding and overlying strata resulting from mud diapirs/mud volcanoes, and formation of gas hydrate caused by upward migration of the middle and deep fluids along the rupture zone to the stable zone.Therefore, the collective fluid flow system in the study area provides a source of fluid for the development of gas hydrate, which is conducive to the accumulation of gas hydrate.It is of great significance for revealing the enrichment rule of gas hydrate and can provide references for gas hydrate exploration in other regions.
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Key words:
- TaiXinan Basin /
- focused fluid /
- flow systems /
- gas hydrate /
- north slope of the South China sea
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