Electrical method and earthquake combined hot dry rock exploration method

Abstract

The invention discloses an electrical method and earthquake combined hot dry rock exploration method. The method comprises the following steps of analyzing a hot dry rock resource potential area according to geological data, and arranging earthquake stations in the potential area at intervals of 2-5km to form a natural earthquake background noise tomography exploration area; interpreting the horizontal wave velocity Vs of a low-wave velocity layer to be less than 3.4 m / s according to an S-wave earthquake imaging profile map obtained by a natural earthquake background noise tomography method; in a low-speed layer area with relatively shallow burial depth, enabling an electrical exploring area to cover a low-speed layer area through an electrical survey line arranged through magnetotelluric sounding, and interpreting that the electrical resistivity range of an existing high-conductivity layer is 1-10 omega.m by an electrical profile; and integrating a low-wave-velocity layer and a high-conductivity layer, preferably selecting a ''low-speed high-conductivity layer'', arranging a two-dimensional / three-dimensional seismic exploration section on the earth surface corresponding to the ''low-speed high-conductivity layer'', forming a two-dimensional / three-dimensional seismic exploration area, preferably selecting a hot dry rock exploration target area according to the two-dimensional / three-dimensional seismic exploration result, referring site conditions , and carrying out hot dry rock drilling. The method is used for verifying whether the hot dry rock target rock mass temperature is higher than 180 DEG C.

Description

technical field [0001] The invention belongs to the technical field of hot dry rock resource exploration, in particular to a hot dry rock exploration method combined with electrical method and seismic method. Background technique [0002] Hot dry rock refers to a high-temperature rock mass buried thousands of meters underground that does not contain water or steam. It is mainly igneous rock with a temperature higher than 180°C. It is characterized by high temperature, hardness and compactness. The development potential of hot dry rock resources is huge. It is estimated that the energy contained in the hot dry rock within the depth range of 3-10 kilometers deep in the earth's crust is equivalent to 30 times the total energy of global fossil energy. As a green, clean, safe and efficient high-temperature geothermal energy, the resource of hot dry rock With a huge amount and wide distribution, it is a strategic alternative energy source with great development prospects. With the...

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Problems solved by technology

At present, drilling is considered to be the most direct and effective method for hot dry rock exploration. However, due to the high cost and long construction period of hot dry rock drilling, it is difficult to apply it on a large scale in the early stage of hot dry rock exploration, and it is the most economical method for hot dry rock exploration. Efficient means of geophysical prospecting have not yet formed a set of systematic prospecting techniques and methods

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