Numerical modelling of passive electroseismic surveying

SUMMARY This work reports numerical modelling of electroseismic conversions when the electric field source originates in atmosphere. Layered structures conductivity anomalies yield rotated fields at reservoir depths as large surface. Active-source tests imaged reservoirs 1800 m deep. However, required high-power, dipole sources mediate against these methods finding practical application hydrocarbon exploration. We extend previous research by considering potential for using environmental to create useful conversions. World-wide lightning strikes induce time-dependent In frequency band appropriate seismic surveying, 1–100 Hz, electromagnetic pulses occur a rate 10–100 per second. These horizontal earth’s surface that currents subsoil. Those preferentially channel through high-conductivity layers. Charge accumulates termini conducting That charge accumulation induces galvanic currents. Vertical propagate depth where they generate propagating waves gradients electrical properties, such reservoirs. use 2-D simulations on three different, layered-earth models estimate amplitudes generated passive fields. The shows transverse magnetic can potentially vertical depth. top are sensitive oil content reservoir, primary field, geometry layers and various material properties. Finally, hypothetical laterally complex configuration was tested which confirms mentioned results additionally ability proposed method delineate water–oil contacts.