白云石与富硅流体的水—岩反应实验及其储层地质意义
发布时间:2018-01-30 00:38
本文关键词: 白云石 含硅热液 水岩反应 滑石 碳酸盐储层 出处:《地质论评》2017年06期 论文类型:期刊论文
【摘要】:含硅热液是影响深层白云岩储层的一种重要的流体类型,其如何与白云岩相互作用以及能否促使深层有效白云岩储层发育,是当前流体地质学与碳酸盐储层地质学研究需要进一步揭示的科学问题。本文以CaMg(CO_3)_2—SiO_2—H_2O体系为例,应用熔融毛细硅管合成包裹体技术和原位激光拉曼光谱分析技术,结合淬火微区X衍射、扫描电镜观察及能谱分析等手段,研究了富硅流体与白云石的水岩反应机理。结果表明,白云石与富硅流体在100℃以上即可发生脱碳反应产生CO_2,200℃时的反应机理为:3CaMg(CO_3)_2(白云石)+4SiO_2+H_2O=Mg_3(Si_4O_(10))(OH)_2(滑石)+3CaCO_3+3CO_2。据此,认为滑石这类富镁硅酸盐矿物可以作为白云岩储层含硅热流体作用的证据。深部富硅热液沿断裂向上运移,与白云岩反应后沉淀滑石等富镁硅酸盐矿物,继而导致储集空间的减少,但是气相产物CO_2是重要的酸性气体,可以在合适的地质条件下溶蚀碳酸盐矿物,有利于深埋条件下储集空间的形成与保存。
[Abstract]:Silicon-bearing hydrothermal solution is an important fluid type that affects the deep dolomite reservoir, how it interacts with dolomite and whether it can promote the development of deep effective dolomite reservoir. Fluid geology and carbonate reservoir geology need to be revealed further. This paper takes CaMg(CO_3)_2-SiO_2-H_2O system as an example. The melt capillary silicon tube was used to synthesize inclusions and in situ laser Raman spectroscopy (LRS), combined with X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) analysis of quenched microregions. The mechanism of water-rock reaction between silicon-rich fluid and dolomite is studied. The results show that the decarburization reaction between dolomite and silicon-rich fluid can take place at more than 100 鈩,
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