Geothermal Model of the Lahendong Geothermal Field, Indonesia
Geothermal Model of the Lahendong Geothermal Field, Indonesia
复制标题
印度尼西亚 Lahendong 地热田的地热模型
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
H. Franzson
中科院分区：
文献类型：
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作者：
H. Koestono;E. E. Siahaan;M. Silaban;H. Franzson
Lahendong地质构造油气田位于苏拉威西岛的北方颈臂。该油田是潘戈拉火山口凹陷的一部分，东部结构清晰，但西部相对开放。Pangolupian破火山口的凹陷是Lahendong地热系统中最重要的凹陷之一。地表热构造主要受北西-南东向和北东-南西向断裂控制，控制了拉痕洞系的渗透性。拉很洞地热田为热水型地热田，分为南、北方两个热储层。总共有23口威尔斯井已钻到这些储层中。南部的温度为300至350摄氏度，干燥度约为80%，北方的温度较低，在250至280摄氏度之间，干燥度约为30%。在该领域遇到三个主要的蚀变带，即蒙皂石带、蒙皂石-绿帘石带和伊利石-葡萄石-绿帘石带。蒙皂石带主要以低温粘土和电阻率<10 Ω mm的薄层出现为特征。蒙皂石-伊利石-绿帘石带以酸性层的出现为特征，伊利石-葡萄石-绿帘石带以绿帘石、绿帘石、葡萄石和次生石英的出现为特征。温度分布表明，该区地热资源利用的有利部位位于LHD-4井场的NW、W、SW方向和LHD-5井场的W、SW方向。
Lahendong Geothermal Field is tectonically located in the northern neck arm of Sulawesi Island. The field is part of the depression of the Pangolombian caldera with clear structures in the eastern part but relatively open to the west. The depression of the Pangolombian caldera is being one of the most important with respect to the geothermal system in Lahendong. Thermal structures on surface are mostly fault controlled with a dominant NW-SE and NE-SW directions, and are believed to control the permeability of the Lahendong system. The Lahendong geothermal field is hot water dominated system divided into two reservoirs, the Southern and Northern one. A total of twenty three wells have been drilled into these reservoirs. The Southern one has temperatures of 300 to 350C with dryness about 80%, and the northern one has lower temperatures between 250 to 280C with dryness around 30%. Three main alteration zones are encountered in this field namely smectite zone, smectite-chlorite and illite-prehnite-epidote zones. The smectite zone is mainly characterized by the appearance of low temperature clay and a layer with resistivity <10 ohmm. The smectite-illite-chlorite zone is characterized by the appearance of an acid layer and illite-prehnite-epidote zone is characterized by the appearance of chlorite, epidote, prehnite, and secondary quartz. The temperature distribution shows that the interesting site for geothermal resource utilization in the field is located in the NW, W, and SW direction of well pad LHD-4 and W and SW direction of well pad LHD-5.