borehole
Quick Summary
A borehole is a hole drilled into the Earth. These holes can be exploratory wells or small-diameter wells used to obtain water.1
In geological science, boreholes are crucial for direct sampling, allowing for the positive identification, quantification, and recovery method selection of materials like ores and fuels. They are typically drilled using the rotary method, where a rotating drill bit circulates fluid to remove rock chips for analysis. Percussion methods are sometimes used for shallow boreholes in hard rock. Measurements of various physical properties can also be taken within boreholes using specialized tools called sondes.2
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