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首页> 外文会议>Workshop on Geothermal Reservoir Engineering >SUBSURFACE HYDROTHERMAL ALTERATION IN THE KAMOJANG GEOTHERMAL FIELD, WEST JAVA, INDONESIA
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SUBSURFACE HYDROTHERMAL ALTERATION IN THE KAMOJANG GEOTHERMAL FIELD, WEST JAVA, INDONESIA

机译：中国西爪哇省Kamojang地热场所的地下水热改变

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The presently vapor-dominated Kamojang geothermal field is located in West Java (Indonesia). The field lies in high terrain, 1500 m above sea level, and is hosted by volcanic rocks. Samples from seven wells were kindly made available for this study, namely from KMJ-7, KMJ-10, KMJ-11, KMJ- 12, KMJ-53, KMJ-59, and CHR-1 drilled to depths ranging from 536-1804 m. The reservoir is hosted by interbedded pyroclastic and lavas of andesite composition with some basaltic andesites and lacustrine tuffs. The field is now vapor-dominated but the hydrothermal minerals show that the rock-altering fluid were dominantly liquid. There are 2 hydrothermal mineral assemblages present, namely those produced by "acid" and "neutral" pH fluids. The "acid" mineral assemblage which occupies shallow levels (down to 100-300 m) consists of kaolin, smectite, alunite, quartz, cristobalite, and pyrite. The altering fluid was of acid sulphate type formed due to the oxidation of H_2S. The "neutral pH" mineral assemblage occupies deeper levels and comprises varying proportion of quartz, adularia, albite, epidote, titanite, wairakite, laumontite, calcite, siderite, hematite, pyrite, anhydrite, smectite, chlorite, illite, and interlayered clays. The altering fluid was liquid of near neutral pH, and chloridesulphate type. In general, the present-day measured downwell temperatures are lower than those indicated by the alteration mineralogy (i.e. epidote, wairakite, laumontite, and clays) by about 10-50 deg C and fluid inclusion homogenisation temperatures (by about 60 deg C). This suggests cooling, although some of the measured downwell temperatures may be too low. Permeability has decreased due to mineral deposition, but tectonic activity has helped prolong it by reopening vertically permeable features. Hydrothermal mineral parageneses and vein crosscutting relationships in the deeper levels (below the "acid" assemblage zone), for example vein filled with quartz only and quartz+wairakite-calciteanhydrite cut by vein of quartz-pyrite, suggest that although this field has undergone at least three hydrothermal episodes, the composition of the altering fluid was always of near neutral pH.
机译：目前蒸气占kamojang地热场位于西爪哇（印度尼西亚）。该领域位于海拔1500米的高地形，并由火山岩岩石举办。七台井的样品可供本研究，即来自KMJ-7，KMJ-10，KMJ-11，KMJ-12，KMJ-53，KMJ-59和CHR-1深度范围从536-1804钻m。储存器由与一些玄武岩和座位凝固术和湖泊牙龈的互粘土组合物的嵌入式发球菌和熔化物托管。该领域现在蒸汽支配，但水热矿物质表明，岩石改变液体是占主导地液体。存在有2个水热矿物组合，即由“酸”和“中性”pH流体产生的那些。占浅水平（下至100-300米）的“酸”矿物组合包括高岭土，蒙脱石，三农，石英，丙基铝酸盐和黄铁矿。改变的流体是由于H_2S的氧化而形成的酸硫酸盐型。在“中性pH”的矿物组合占据更深层次和包括改变石英，冰长石，钠长石，绿帘石，榍，wairakite，浊沸石，方解石，菱铁矿，赤铁矿，黄铁矿，硬石膏，蒙脱石，绿泥石，伊利石的比例，和层间粘土。改变液是近中性pH的液体，氯酸盐型。通常，本日测量的静止温度低于改变矿物学（即食菜，Wairakite，Laumontite和粘土）所示的那些，通过约10-50℃和流体包容均匀化温度（约60℃）。这表明冷却，尽管一些测量的静止温度可能太低。由于矿物沉积，渗透性降低，但构造活性通过重新打开垂直透过特征，帮助延长了它。水热矿物原体和静脉跨越关系在更深层次的水平（“酸”组合区域下方），例如含有石英的静脉，用石英 - 黄铁矿静脉切割石英+ Wairakite-CalciteAldrite，表明虽然该领域已经历过至少三种水热发作，改变液的组成始终是近中性pH。

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