Mapping the Geothermal System Using AMT and MT in the Mapamyum (QP) Field, Lake Manasarovar, Southwestern Tibet

He, Lixia; Chen, Ling; Dorji,; Xi, Xiaolu; Zhao, Xuefeng; Chen, Rujun

doi:10.3390/en9100855

Cited by 19 publications

(6 citation statements)

References 33 publications

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“…China is currently the world's largest coal miner, and it is also the largest consumer of coal in the world [1][2][3][4][5][6]. The start of the 21st century was a golden era for the coal sector, and the rapid expansion of coal firms led to huge profits [7,8].…”

Section: Introductionmentioning

confidence: 99%

Application of Transient Electromagnetic Method for Investigating the Water-Enriched Mined-Out Area

Liu

et al. 2018

Applied Sciences

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The water-enriched mined-out area, which led to frequent accidents and the serious destruction of ecological environment and serious threat to coal-mining practices. To ensure safe mining practices and to avoid the intrusion of water from the bases of coal deposits, the detection of the mined-out areas, especially the water-filled mined-out area in advanced, is one of the most important issues. This research focuses on detecting mined-out area enriched by water with the large-loop transient electromagnetic method. Data acquisition system was arranged along 23 survey lines, and the total of 1975 survey points were recorded. An inversion technique was used to interpret the TEM data. The inversion results suggested that the mined-out areas enriched by water always exhibit a very low-resistivity, the resistivity contour present closed circle sharp. There are three main water enriched mined-out areas, named JS1, JS2, and JS3 in the north part of the survey area, as well as three main water weak-enriched areas named RJS1, RJS2 and RJS3 in the west and southwest part of the survey area can be inferred by TEM, the interpretation results were verified by drilling. Large loop TEM is proved as an efficient way to investigate water enriched mined-out areas under the rugged topography conditions, and this work provides more detailed geological information to the coal mining enterprise for further coal-mining practices safety arrangement.

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Section: Introductionmentioning

confidence: 99%

Application of Transient Electromagnetic Method for Investigating the Water-Enriched Mined-Out Area

Liu

et al. 2018

Applied Sciences

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“…Moreover, MT can probe both shallow and deep areas up to several tens of kilometers. Because of the electrical conductivity sensitivity and the investigation depth, MT has been widely used in geothermal explorations [10][11][12]. MT data inversion using geological and geophysical constraints enables us not only to determine the general conductivity distribution in the studied area but also to delineate the geothermal reservoir and detect the cap layer [9].…”

Section: Introductionmentioning

confidence: 99%

Magnetotelluric Imaging of the Zhangzhou Basin Geothermal Zone, Southeastern China

Wang

et al. 2018

Energies

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The geothermal zone of southeast China, which is one of the country’s known geothermal zones, contains significant natural geothermal resources. To understand the formation of geothermal resources, a magnetotelluric (MT) investigation with a site spacing of 1–2 km was carried out around the Zhangzhou Basin. The recorded MT data were processed by robust time series and remote reference processing techniques. The data analysis results revealed that two-dimensional (2-D) modeling can be used to approximately determine the electrical structure. The joint inversions of TE and TM modes have been performed after distortion decomposition. In the inversion models, a low resistivity cap of 200–800 m thickness was observed, which represented the blanketing sediments composed of Quaternary and volcanic rocks of the late Jurassic period. The presence of high resistivity above a depth of 20 km indicates the granites are widely developed in the upper and middle crust. MT measurements have revealed some deep-seated high conductive zones, which were inferred to be partially melting at depth of 8–17 km, which is likely to be reason behind the formation of higher-temperature hot springs. The results also show that there is a shallower Moho, which indicates that the heat from the upper mantle may have a big contribution to the surface heat flow. Fractures-controlled meteoric fluid circulation is the most likely explanation for the hot springs.

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“…When the rock is partially molten, its resistivity will decrease signi cantly. Generally, the resistivity range of 1-10 Ω•m is used as the basis for delineating the partially molten layer in the crust (Li et al, 2003;He et al, 2016;Zhang et al, 2020). When the rock is partially melted, its volume changes and the density decreases, which shows low gravity anomaly (Gu et al, 1980).…”

Section: Discussionmentioning

confidence: 99%

3-D Inversion of Gravity Data of the Central and Eastern Gonghe Basin for Geothermal Exploration

Zhao

Zeng

Zhou

2022

Preprint

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The Gonghe Basin is one of the most important regions for the exploration and development of hot dry rock geothermal resources in China. However, there are still some controversies about the genetic mechanism of the hot dry rock geothermal system in the Gonghe Basin. Geophysical exploration methods are important means of geothermal resource exploration. Gravity exploration is a kind of geophysical exploration method based on the density difference of natural rock ore bodies. It has the advantages of low cost, high resolution, wide coverage, and large detection depth. It plays an important role in identifying faulted structures and delineating concealed rock ore bodies. Combined with previous research results including three-dimensional magnetotelluric imaging and linear inversion of Rayleigh wave group and phase velocity result, we obtained a high-resolution underground spatial density distribution model of Gonghe Basin based on satellite gravity data by using 3-D gravity focusing inversion method. According to the results, there are widely distributed low-density anomalies relative to surrounding rock in the middle crust of the study area. According to the previous research results, the low density layer is speculated to be a low-velocity, high-conductivity partial melting layer in the crust of the Gonghe Basin. The results of this study for the first time confirm the existence of partial melting layer based on gravity data inversion, and quantitatively explain the underground structure of the Gonghe Basin and the mechanism of geothermal system. This high-temperature melting layer may be the main heat source of the hot dry rock geothermal resources in the Gonghe Basin. Then the heat energy transfer from the hidden faults to the shallow reservoir rocks. The overlying cenozoic sedimentary strata can serve as the caprock for the geothermal system in the Gonghe basin.

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Mapping the Geothermal System Using AMT and MT in the Mapamyum (QP) Field, Lake Manasarovar, Southwestern Tibet

Cited by 19 publications

References 33 publications

Application of Transient Electromagnetic Method for Investigating the Water-Enriched Mined-Out Area

Application of Transient Electromagnetic Method for Investigating the Water-Enriched Mined-Out Area

Magnetotelluric Imaging of the Zhangzhou Basin Geothermal Zone, Southeastern China

3-D Inversion of Gravity Data of the Central and Eastern Gonghe Basin for Geothermal Exploration

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