Electro telluric resonance logging

[摘要] Electro telluric resonance logging (ETR-Logging) uses the naturally-occurring electric currents flowing through the rock strata within the body of the Earth to obtain information in regard with the electrical structure of the rock layers. An orthogonal configuration of ground antenna oriented NS and WE and the corresponding electronic circuitry are used for capturing the telluric signals. The position of the logging point is located at the centre of the orthogonal ground antenna. Deep bore holes are not required. The workings of the ETR-Logging follow the principle of the resonance between two signals and the skin-depth effects. The operating mechanisms of the ETR-Logging also conform with the Ohm's Law. A stratum with high resistivity characteristics, such as a saturated oil-bearing formation, gives high amplitude of resonance response and a wide range of phase angle variation of telluric energy. A stratum with low resistivity characteristics such as saline-water-filled sands, gives low amplitude resonance response and wide range phase angle variation. ETR-Logging at three locations in North Kalimantan and one location South Kalimantan, demonstrate the results of this technique. It is effective in predicting the present and the abundance of the deposits as well as verifying the quality of the seals.

[发布机构] Pukesmigas, Trisakti University, Jakarta, Indonesia^1

[效力级别] 矿业工程

[关键词] Electrical structures;Electronic circuitry;High resistivity;Naturally occurring;Operating mechanism;Orthogonal configurations;Resonance response;Skin depth effects