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Building a geothermal formation model using microtremor array measurement

A comprehensive understanding of the internal structure and building a geomechanical formation model plays an important role in developing and utilizing geothermal resources. Formation models help in identifying the channel and cycling modes of the heat flow. Due to the urban sprawl and development, constructing a formation model of geothermal resources based on data from traditional geophysical methods is challenging. The Microtremor survey method was adopted to obtain critical information in Jimo, which is famous for rare seawater geothermal resources in China. Three microtremor survey lines were deployed to identify subsurface structures up to 2 km into the ground. Dispersion curves of Rayleigh waves with frequencies from 0.4 Hz to 10 Hz were extracted using the spatial auto-correlation method. An empirical equation was adopted to obtain the apparent S-wave velocity of each survey point, and plot the apparent S-wave velocity sections. The obtained sections reveal the development of two interacting faults. They form a channel for the heat-flow cycle. Two conceptual models were established to depict the formation and cycling modes of seawater geothermal resources in Jimo, based on the results and analysis. The proposed model will help verify the geothermal system and scientifically guide the development of unique geothermal resources . Moreover, the developed model verified that the microtremor survey method is effective and dependable for identifying fracture zones and strata.