Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Spontaneous potential (SP), also called self potential, is a naturally occurring electric potential difference in the Earth, measured by an electrode relative to a fixed reference electrode. Although SP differences have been measured along the Earth's surface in mineral exploration, today it is used almost exclusively by the oil and gas industry for formation evaluation in boreholes. SP was first recognized by Conrad Schlumberger, Marcel Schlumberger, and E.G. Leonardon in 1931, and the first published examples were from Russian oil fields.
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