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首页> 外文会议>Geothermal Resources Council annual meeting >Distribution of Clay Minerals Through a Conductive (MT) Zone on the Margins of a High-Temperature Geothermal Reservoir, Wairakei Geothermal Field, Taupo Volcanic Zone, New Zealand
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Distribution of Clay Minerals Through a Conductive (MT) Zone on the Margins of a High-Temperature Geothermal Reservoir, Wairakei Geothermal Field, Taupo Volcanic Zone, New Zealand

机译：新西兰陶波火山区怀拉基地热田高温地热储层边缘的导电（MT）带粘土矿物分布

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Recent magnetotelluric (MT) surveys of the Wairakei-Tauha-ra Geothermal Field, Taupo Volcanic Zone, New Zealand, have defined a 200 - 300 m thick conductive layer (i.e., ＜5 Ωm) across the shallow parts (～0 - 500 m depth) of the reservoir. This layer is shallowest above the upflow regions of the reservoir, draping to greater depths on its margins. It shows good stratigraphic correspondence to the top of a rhyolite lava unit (i.e., Karapiti 2 A) and the base of the Huka Falls Formation. Our study investigates the clay mineral distribution through the conductor in ten geothermal wells in the Otupu area, a region of infield injection in the eastern parts of the Wairakei field where the conductor deepens. We use a combination of methylene blue (MeB) testing to estimate the abundance of smectite; shortwave-length infrared (SWIR) analysis and X-ray diffraction (XRD) clay separate analysis. The results show that smectite is at greatest abundance at the top of the conductor (i.e., 3-7 Ωm), in the Huka Falls Formation. The most conductive intervals (i.e., 1-5 Ωm) are dominated by interlayered illite-smectite, occurring at the top of the Waiora Formation directly beneath the Huka Falls sediments. Illite is present in most wells below illite-smectite dominated intervals. Beneath the conductor, with increasing depth and resistivity in wells located close to the reservoir boundary, there is a reversal of clay rank to smectite at low abundances. For wells located away from the boundary, illite remains the dominant clay mineral with increasing depth. The conductor reflects the geohydrological structure of the shallow reservoir, with geothermal fluids trapped beneath a relatively impermeable Huka Falls sediments. The deepening of the conductor to the north is where the Karapiti rhyolite is absent and the base of the Huka Falls Formation is deepest.
机译：新西兰陶波火山区怀拉基-陶哈拉地热场的最新大地电磁（MT）勘测已在浅层部分（约0-500 m）内定义了200-300 m厚的导电层（即＜5Ωm）。深度）。该层在储层上流区上方最浅，在其边缘悬垂到更大的深度。它与流纹岩熔岩单元（即Karapiti 2 A）的顶部和Huka Falls组的底部显示出良好的地层对应关系。我们的研究调查了奥图普地区十个地热井中通过导体引起的粘土矿物分布，奥图普地区是怀拉基油田东部地区内场注入区域，导体在该区域内加深。我们结合使用亚甲蓝（MeB）测试来估算蒙脱石的丰度;短波红外（SWIR）分析和X射线衍射（XRD）粘土分离分析。结果表明，在Huka Falls组中，蒙脱石在导体顶部的丰度最大（即3-7Ωm）。导电性最强的层段（即1-5Ωm）主要由夹层伊利石-蒙脱石所控制，该层间伊利石-蒙脱石发生在Huka Falls沉积物正下方的Waiora地层的顶部。在伊利石-蒙脱石为主的层段以下的大多数井中均存在伊利石。在导体下方，随着靠近储层边界的井的深度和电阻率的增加，在低丰度的情况下，粘土等级向蒙脱石转变了。对于远离边界的井，伊利石仍是深度增加的主要粘土矿物。导体反映了浅层储层的水文结构，地热流体被困在相对不可渗透的胡卡瀑布（Huka Falls）沉积物之下。导体向北的加深之处是缺少卡拉皮蒂流纹岩，而胡卡瀑布组的底部则最深。

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