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首页> 外文会议>23rd New Zealand Geothermal Workshop 2001, 2001, Auckland >MINERAL ALTERATION IN A LOW-ENTHALPY HYDROCARBON WELL, TARANAKI, NEW ZEALAND
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MINERAL ALTERATION IN A LOW-ENTHALPY HYDROCARBON WELL, TARANAKI, NEW ZEALAND

机译：新西兰塔拉纳基低焓油气井的矿物蚀变

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Mineral alteration in the Eocene Mangahewa Formation sub-arkoses of Well Mn-2 is a product of millions of years of water-rock interaction in a rock-dominated environment. The thermal peak, at about 150℃, occurred 4Ma ago. Since then temperatures have fallen to about 120-130℃. Temperature, pressure, permeability/porosity, degradation of organic material, the composition of porewaters and gases and time induce alteration and deposition of new minerals in this low enthalpy hydrocarbon well. Kaolinite, illite-smectite, pyrite and carbonates may have initially formed under near-equilibrium conditions but subsequent coarsening of crystals or ion diffusion within or among crystals may be kinetically-induced. In contrast, the growth of quartz during the diagenetic history of the Mangahewa Formation may be entirely kinetic. Healed fractures and overgrowths in quartz indicate that earlier solutions were enriched in Cu and Zn while the later ones have high contents of Ca, K, Ni, Cl and Ge.
机译：Mn-2井始新世Mangahewa组亚黑糖的矿物蚀变是在岩石为主的环境中数百万年水-岩相互作用的产物。 150℃左右的热峰出现在4Ma之前。从那以后，温度下降到约120-130℃。温度，压力，渗透率/孔隙度，有机物质的降解，孔隙水和气体的组成以及时间会在这种低焓烃井中引起新矿物的改变和沉积。高岭石，伊利石-蒙脱石，黄铁矿和碳酸盐可能最初是在接近平衡的条件下形成的，但随后晶体的粗化或晶体内部或之间的离子扩散可能是动力学诱导的。相反，在Mangahewa组的成岩过程中石英的生长可能完全是动力学的。石英的裂缝和过度生长的愈合表明，较早的溶液中富含铜和锌，而较晚的溶液中钙，钾，镍，氯和锗的含量较高。

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