SPARKER-TYPE WELLBORE SEISMIC ENERGY SOURCE HAVING CONTROLLABLE DEPTH-INDEPENDENT FREQUENCY

摘要

A wellbore seismic source (17) includes a sparker (17B) electrically coupled to a power source. The sparker (17B) is disposed in a pressure - sealed canister (17A), wherein the canister (17A) is at least partially filled with liquid. At least one of the pressure of the liquid and the energy discharged by the power source through the sparker (17B) is selected to cause emission of acoustic energy at a selected frequency.