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Magnetotelluric investigation of the geothermal anomaly in Hailin,Mudanjiang,northeastern China

Magnetotelluric investigation of the geothermal anomaly in H...

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中国科学院地质与地球物理研究所2015年度（第15届）学术年会

作者： Lili Zhang Tianyao Hao Qibin Xiao Jie Wang Liang Zhou Min Qi Xiangpan Cui Ningxiao Cai Key Laboratory of Petroleum Resources Research Institute of Geology and GeophysicsChinese Academy of Sciences State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum Beijing 102249People's Republic of China Institute of Geology China Earthquake Administration Institute of Mineral Resources Research China Metallurgical Geology Bureau

To study the occurrence conditions and locations of geothermal bodies in Hailin,Mudanjiang,northeastern China,we conducted a magnetotelluric investigation to delineate the electrical conductivity structure of the area on three parallel *** area to the west of the Mudanjiang Fault lies in the hailang sag of the Ning’an *** data were processed using the mutual reference technique,static shift correction,and structural strike and dimensionality analysis based on tensor ***,a modified anisotropic-diffusion-based method was used to suppress noise for the magnetotelluric time series *** method retains the advantages of conventional anisotropic diffusion and is superior in its discrimination *** method is characteristic not only of the inherited features such as intra-region smoothing and edge preservation,but also of the adaptive selection of the diffusion *** analysis revealed that the electrical resistivity structure can be approximated by a two-dimensional ***-dimensional inversion and rendering visualization show that a highly resistive granite basement is covered with conductive sedimentary layers and that a relatively lowresistivity anomalous structure with a resistivity of approximately 100-600 Ω-m is imbedded in the highresistivity *** anomalous structure has a narrow top and a wide bottom(the bottom depth is at least 3500 m).The shape and electrical features of the structure indicate favorable storage space for hot subsurface *** activities and magma intrusion may result in the fractures of the basement,which are filled with hot water and thus produce the relatively low *** on a comprehensive analysis,we infer that the structure is indicative of a geothermal *** exploratory well drilled near the structure confirms the occurrence of high *** geological factors(cap rock,basement,and major faults]determine the favorable geothermal

关键词： Magnetotelluric survey Geothermal exploration Modified-anisotropic-diffusion-based denoising hailang sag The Mudanjiang Fault

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