Development of the Vertical Electro Magnetic Profiling (VEMP) method

✍ Scribed by Yasuo Miura; Kazumi Osato; Shinji Takasugi; Hirofumi Muraoka; Kasumi Yasukawa

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 515 KB
• Volume: 35
• Category: Article
• ISSN: 0926-9851
• DOI: 10.1016/0926-9851(96)00021-3

✦ Synopsis

As a part of the "Deep-Seated Geothermal Resources Survey (DSGR)" project being undertaken by the New Energy and Industrial Technology Development Organization (NEDO), the "Vertical Electro Magnetic Profiling (VEMP)" method is being developed to accurately obtain deep resistivity structures. The VEMP method takes multi-frequency three-component magnetic field data in an open hole well using controlled source transmitters emitted at the surface (either loop or grounded-wire sources). Numerical simulations using EM3D have demonstrated that phase data of the VEMP method is not only very sensitive to the general resistivity structure, but will also indicate the presence of deeper anomalies. Forward modelling was used to determine the required transmitter moments for various grounded-wire and loop sources for a field test using the WD-1 well in the Kakkonda geothermal area. VEMP logging of the WD-1 well was carried out in May 1994 and the processed field data matches the computer simulations quite well.