Introduction of information acquisition method and controlled seismic fracturing technology for granite-type hot dry rock reservoir

Abstract:

As a kind of clean energy with large reserves， hot dry rock geothermal is gradually affecting the world energy pattern under the increasingly severe environmental protection situation， and has become the focus of academia， government and enterprises. The development of granite-type hot dry rock requires the establishment of Enhanced Geothermal Systems （EGS） and the core of EGS is to drill into and fracture the reservoir to form a certain scale of fracture network， and construct a circulation circuit of injection wells and production wells to extract thermal energy for power generation. From the EGS fracturing engineering cases of granite-type hot dry rock such as Basel EGS project in Switzerland and Pohang EGS project in South Korea， it can be found that the induced earthquake has become a key factor restricting the development of granite-type hot dry rock because the specific location of large-size and high-inclination structural plane is not clear， and the flow direction of fracturing fluid in the fracturing process cannot be predicted， which leads to the slip of structural plane caused by fracturing fluid entering such structural plane and inducing earthquake. This article will focus on this problem by identifying the information of the reservoir where the hot dry rock is located and furthermore introduce the construction method of seismic control and fracturing to build artificial heat reservoir for the development of granite-type hot dry rock .