根据 PanZ 地区的重力、磁力和磁电探测数据绘制五要素图像并预测地热场

IF 2.9 2区 地球科学 Q3 ENERGY & FUELS
Guolei Zheng, Jinshui Huang, Peng Zhai, Gang Wang
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引用次数: 0

摘要

PanZ地区地热田预测存在两个问题:(1)平面范围存在争议;(2)垂直范围有待进一步确定。面对这两个问题,我们提出并总结了一套完整的方法,具体如下:将一个地热田划分为热源、断层通道、热储层、盖岩和水五大要素,然后借助重力、磁力和磁层探测(MT)数据对其进行解释和成像,最后根据五大要素的完整性和它们之间的相关性预测地热田。在 PanZ 地区,(1) 利用布格尔重力异常总水平导数的归一化垂直导数来识别断层通道;(2) 利用重力和 MT 数据的综合地球物理剖面的联合解释结果来识别水,而不是单一的 MT 结果;(3) 利用帕克-奥尔登堡反演法将盖岩与布格尔重力异常反演,并借助综合地球物理剖面中的 MT 异常,进一步确定了地热储层的垂直分布;以及 (4) 具有放射性的中间酸性岩浆岩,即侏罗纪岩浆岩。e.,(4) 利用长方体磁性正演公式,通过残余磁异常确定了热源。最后,利用上述方法对两个地热田进行了预测和概述。地热梯度分布和钻孔出水温度的比较表明,预测结果是可信的。为了更好地理解地热田预测方法的效果,利用 GOCAD 软件根据反演结果构建了三维地质模型,并根据水元素在其他四个元素中的迁移、储存、加热和保温作用分析了地热系统的运行机制。为了确定地热田形成的原因,讨论了除水元素以外的四个元素的地质演变。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Image of the five elements and prediction of the geothermal field based on gravity, magnetic and magnetotelluric data in the PanZ area

There are two problems in the prediction of the geothermal field in the PanZ area: (1) the plane scopes have some debates, and (2) the vertical scopes need to be further ascertained. Faced with these two problems, a complete set of methods was developed and summarized, and the details are as follows: a geothermal field can be divided into five elements, i.e., heat source, fault channel, thermal reservoir, cap rock and water; then, they are interpreted and imaged with the help of gravity, magnetic and magnetotelluric (MT) data; and finally, according to the integrity of five elements and the correlation between them, geothermal fields are predicted. In the PanZ area, (1) the normalized vertical derivative of the total horizontal derivative of the Bouguer gravity anomaly was applied to identify the fault channels; (2) the water was recognized using the joint interpretation results from an integrated geophysical profile with gravity and MT data instead of a single MT result; (3) the cap rock was inverted with the Bouguer gravity anomaly, using the Parker–Oldenburg inversion method, and with the help of the MT anomaly in the integrated geophysical profile, the vertical distribution of the geothermal reservoir was further ascertained; and (4) the intermediate acid magmatic rock with radioactivity, i.e., a heat source, was identified with the residual magnetic anomaly, imaged using the magnetic forward formula of the cuboid. Finally, the two geothermal fields were predicted and outlined using the above methods. A comparison of the distributions of the geothermal gradient and the outlet water temperatures of the drill holes indicated that the predicted results are credible. To better understand the effect of the method of predicting the geothermal field, a 3D geological model was constructed from the inverted results using GOCAD software, and the operating mechanism of geothermal system was analyzed based on the migration, storage, heating and insulation of the water element in the other four elements. To determine the reason for the formation of the geothermal field, the geological evolution of four elements was discussed, except the water element.

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来源期刊
Geothermal Energy
Geothermal Energy Earth and Planetary Sciences-Geotechnical Engineering and Engineering Geology
CiteScore
5.90
自引率
7.10%
发文量
25
审稿时长
8 weeks
期刊介绍: Geothermal Energy is a peer-reviewed fully open access journal published under the SpringerOpen brand. It focuses on fundamental and applied research needed to deploy technologies for developing and integrating geothermal energy as one key element in the future energy portfolio. Contributions include geological, geophysical, and geochemical studies; exploration of geothermal fields; reservoir characterization and modeling; development of productivity-enhancing methods; and approaches to achieve robust and economic plant operation. Geothermal Energy serves to examine the interaction of individual system components while taking the whole process into account, from the development of the reservoir to the economic provision of geothermal energy.
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