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首页> 外文会议>Workshop on Geothermal Reservoir Engineering >NUMERICAL SIMULATION OF CHANGES IN MICROGRAVITY AND ELECTROKINETIC POTENTIALS ASSOCIATED WITH THE EXPLOITATION OF THE ONIKOBE GEOTHERMAL FIELD, MIYAGI PREFECTURE, JAPAN
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NUMERICAL SIMULATION OF CHANGES IN MICROGRAVITY AND ELECTROKINETIC POTENTIALS ASSOCIATED WITH THE EXPLOITATION OF THE ONIKOBE GEOTHERMAL FIELD, MIYAGI PREFECTURE, JAPAN

机译：日本宫古县梅花地热场剥削与剥削与剥削相关的电动电位的数值模拟

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摘要

This paper presents the results of a feasibility study to appraise the practicality of using geophysical techniques to detect and characterize subsurface changes induced in geothermal reservoir by field operations. A numerical model of the Onikobe geothermal reservoir (Japan) was developed. The modeling study involved (a) developing a stable solution for the natural state of the field prior to the beginning of field operations in 1975, (b) imposing the known fluid production and injection histories based on field records of well flow rates for the period March 1975-January 1997, and then (c) assuming that well flow rates remain fixed thereafter, forecasting the future response of the reservoir for an additional ten years. Then, the STAR microgravity and electrokinetic potential postprocessors were applied to the reservoir model to calculate the probable changes that will be observable at the surface using these geophysical survey techniques. The strength and spatial distribution of the signals were estimated and the practicality of detecting such signals in the field was appraised. The Onikobe field appears to be a marginal prospect for the utilization of microgravity measurements for future reservoir monitoring based on these calculations, since most of the major microgravity changes have already taken place in the now-mature field. It was estimated, on the other hand, that substantial changes in surface SP started taking place in about 1983, and that these changes are continuing to the present day as a result of the ongoing temporal evolution of the brine productioninjection scheme.
机译：本文介绍了可行性研究的结果，以评估使用地球物理技术来检测和表征地热储层在地热储层所引起的地下变化的实际性。开发了一系列洋基芯地热水库（日本）的数值模型。涉及的建模研究（a）在1975年的现场操作开始之前开发用于场的自然状态的稳定解决方案，（b）根据该期间的井流速的现场记录施换已知的流体生产和注射史1975年3月 - 1997年3月，然后（c）假设流量率仍然待定，预测水库的未来响应额外十年。然后，将星形微疱和电动电位后处理应用于储库模型，以计算使用这些地球物理测量技术在表面上可观察到的可能变化。估计信号的强度和空间分布，检测该领域中这些信号的实用性被评估。由于这些计算，Onikobe领域似乎是利用未来储层监测的微匍匐测量的边际前景，因为大多数主要的微重力变化已经在现在成熟的领域发生。另一方面，它估计，表面SP的大量变化在1983年开始发生，并且由于盐水生产力推荐方案的持续时间演变，这些变化是继续持续到现在的一天。

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