Fracture systematics in and around well WD-1, Kakkonda geothermal field, Japan
Fracture systematics in and around well WD-1, Kakkonda geothermal field, Japan
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DOI：
10.1016/s0375-6505(98)00036-4
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发表时间：
1998-10-01
期刊：
影响因子：
3.9
通讯作者：
Uchida, T
中科院分区：
文献类型：
--
作者：
Kato, O;Doi, N;Uchida, T
通过对卡康达地热田WD-1井FMI（Schlumberger's Fullbore Formation MicroImager）测井资料的解释和对WD-1井现场岩心的观察，为研究控制高温热液循环的裂隙网络的性质和构造提供了重要线索。裂缝包括四组：（1）NW向裂缝，（2）NE至E向高角度裂缝，（3）N向低角度裂缝，（4）E向低角度裂缝。浅层（< 1500 m深度）和深层储层中的大多数渗透性裂缝属于第3组，可能反映了现代应力场中的逆断层作用。低角度的第3组裂缝也是可渗透的，可能是在0.2 +/- 0.1 Ma之前存在的应力场中形成的。裂缝的分布和密度在浅层和深层储层中具有可比性;储层之间的温差与这些变量无关。(C)1998 CNR。由爱思唯尔科技有限公司出版。保留所有权利。
Interpretation of FMI (Schlumberger's Fullbore Formation MicroImager) logs from well WD-1 and observation of spot cores from well WD-1 in the Kakkonda geothermal field have provided important clues about the nature and configuration of the fracture networks controlling circulation of high-temperature hydrothermal fluid. The fractures comprise four groups: (1) fractures striking NW, (2) high-angle fractures striking NE to E, (3) low-angle fractures striking N, and (4) low-angle fractures striking E. Most permeable fractures in the shallow (< 1500 m depth) and deep reservoirs are of group 3, and likely reflect reverse faulting in the modern stress field. Low-angle, group 3 fractures are also permeable, and may have formed in the stress field that existed prior to 0.2 +/- 0.1 Ma. Distributions and densities of fractures are comparable in the shallow and deep reservoirs; the temperature difference between the reservoirs is independent of these variables. (C) 1998 CNR. Published by Elsevier Science Ltd. All rights reserved.