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首页> 外文会议>23rd New Zealand Geothermal Workshop 2001, 2001, Auckland >BOILING AND THERMAL -PRESSURE CHANGES RECORDED IN CALCITE-HOSTED FLUID INCLUSIONS OF THE NGAWHA GEOTHERMAL FIELD, NEW ZEALAND
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BOILING AND THERMAL -PRESSURE CHANGES RECORDED IN CALCITE-HOSTED FLUID INCLUSIONS OF THE NGAWHA GEOTHERMAL FIELD, NEW ZEALAND

机译：新西兰NGAWHA地热场的钙长石质流体包裹体记录的沸腾和热压变化

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Calcite-hosted fluid inclusions separated from cuttings and cores of Ngawha wells were studied to understand boiling-mixing processes affecting reservoir fluids and the origins of calcite. Evidence of boiling is represented by co-existing liquid-rich and vapour-rich inclusions at most depths and the common occurrence of platy calcite. Over 1000 fluid inclusions have Th values that range from 160 to 306℃ and Tm values that range from -0.4 to -2.5℃. Crushing experiments and Tm data suggest that inclusion fluids contain up to 3.7 wt % CO_2, approximately twice as much as in the modern fluid. It thus appears that calcite and the fluid inclusions formed under a wide range of pressures, some of which approached lithostatic. The build up of high partial pressures of CO_2 is likely due to the impermeable nature of the shallow sedimentary host rocks.
机译：研究了从Ngawha井的岩屑和岩心中分离出的方解石宿主流体包裹体，以了解影响储层流体和方解石成因的沸腾混合过程。沸腾的证据是在大多数深度同时存在富含液体和富含蒸汽的夹杂物以及常见的板状方解石。超过1000种流体包裹体的Th值范围从160至306℃，Tm值范围从-0.4至-2.5℃。压碎实验和Tm数据表明，包裹体流体中的CO_2含量最高为3.7 wt％，约为现代流体的两倍。因此看来方解石和流体包裹体是在很宽的压力范围内形成的，其中一些压力接近岩性。由于浅层沉积基质岩石的不可渗透性，可能会形成较高的CO_2分压。

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