THE THERMODYNAMICS OF MUD DIAPIR/VOLCANO FLUID AND ITS INFLUENCE ON GAS HYDRATE OCCURRENCE
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摘要:
泥底辟/泥火山流体热效应对天然气水合物赋存的影响是探索泥底辟/泥火山发育区水合物赋存规律的关键问题。笔者在分析总结国外泥底辟/泥火山流体热异常及其对天然气水合物赋存之影响的基础上，重点探讨了我国南海北部陆坡珠江口盆地神狐海域SH5站位未钻获水合物的原因及泥底辟/泥火山流体热效应对天然气水合物赋存的影响。当初寄予厚望的位于泥底辟之上的SH5站位未成功钻遇水合物的原因是晚期泥底辟刺穿水合物稳定带使深部高温流体沿着泥底辟和断裂通道上侵，该过程致使水合物稳定带温度场升高进而导致早期形成的水合物发生分解，因此，泥底辟/泥火山的流体热效应会直接制约水合物的赋存。探索泥底辟/泥火山流体热效应及其对水合物成藏的影响，不仅为丰富和完善流体渗漏构造环境下天然气水合物成藏动力学研究与勘探提供了热力学理论依据，而且对天然气水合物勘探开发及资源潜力评价等具有重要的指导意义。
Abstract:The effect of mud diapir/mud volcano fluid on gas hydrate occurrence is a key problem to exploration of hydrate distribution in a mud diapir/mud volcano development zone. In this paper, we studied the thermodynamics of mud diapir/mud volcano fluid and its influence on gas hydrate occurrence, and the reason for giving up drilling of hydrate at the station SH5 of the Shenhu area of the Pearl River Mouth Basin in the northern South China Sea is discussed. The station of SH5 is located above a mud diapir.It seemed very hopeful in the beginning, but failed to collect hydrate samples successfully by drilling later on, since mud diapir piercing through the hydrate stability zone had made the deep thermal fluids migrating along the mud diapir and fracture channels.This process changed the temperature field of the hydrate stability zone and resulted in the decomposition of gas hydrates. Therefore, the mud diapir or mud volcano fluid thermal effect may directly influence the occurrence of hydrates. Exploring the movement of mud diapirs/mud volcanoes fluids and their thermal effects on hydrate accumulation will not only provide a theoretical basis for the research of gas hydrates accumulation dynamics under a fluid leakage tectonic environment, but also be important to gas hydrate exploration and development as well as resource assessment.
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Key words:
- mud diapir/mud volcano /
- thermodynamics of fluid /
- gas hydrate /
- SH5 station
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图 4 从过Hakon Mosby泥火山中心浅层温度剖面图中得到的温度梯度数据图，剖面呈NNW—SSE向，从上往下分别为2003年ARK-XIX/3b、2005年AWI-ROV和2006年VICKING这3个航次得到的原位温度数据资料(据文献[6]修改)
Figure 4.
图 5 2003年ARK-XIX/3b航次运用重力取心测量得到的Hakon Mosby流体流速和温度数据。实线代表估算的垂向流体流速，虚线代表海底20 m深处的温度，GC2所在位置为泥火山几何中心(据文献[6]修改)
Figure 5.
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