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SELF POTENTIAL (SP)

SELF POTENTIAL (SP). Achmad Y oshi S atriady Muhamad Ha rfan Yusuf H adi. Self Potential Surveying. Introduction This method measures naturally occurring electrical potentials on the ground surface.

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SELF POTENTIAL (SP)

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  1. SELFPOTENTIAL (SP) AchmadYoshiSatriady MuhamadHarfan Yusuf Hadi

  2. Self Potential Surveying Introduction • This method measures naturally occurring electrical potentials on the ground surface. • The spontaneous or natural potentials developed in the earth by electrochemical actions between minerals and subsurface fluids or by electrokinetic processes involving the flow of ionic fluids.

  3. Basic Concept • Electrofiltration Potential The flow of fluid through a capillary or porous medium may generate an electrical potential (called the streaming potential) along the flow path

  4. Basic Concept • Mineralization Potential

  5. Types of natural electric potential

  6. Types of SP anomalies and their geological source

  7. Field Procedure • Fixed-Based Configuration • Dipole Configuration (Gradient Configuration)

  8. Aplication of Self-Potential Method • Detection of Buried Tank • Self-potential signals associated with ground water flow

  9. Jl.Siliwangi ITB Jl.Tamansari Lokasi Penelitian U Lokasi Pengukuran Anomali SP • Daerah survey dilakukan di Lebaksiliwangi Sabuga Bandung • Luas daerah pengukuran 14 x 9 m2 • Teknik pengukuran yang dipakai Metode Amplitudo Potensial

  10. Pola pengukuran • Jumlah titik pengukuran 150 grid • Jarak tiap titik panjang maupun lebarnya sebesar 1 meter, dengan 1 titik acuan tetap

  11. Kontur Pengukuran Hasil Survey SP

  12. Gambar 3D dari pengukuran SP

  13. Hasilkurvaanomalikordinat -4 yang didapatsetelah data processing • daritabeldangrafikdisampingdiketahui : • V(0) = -2,5 mV • xo = -0,122 meter • L(xi) = hasilpengukuranpotensial yang dianggap anomaly • q (silinder) = 1 (sesuaireferensimenurutBhatacharyadan Roy) merupakanordinatposisi yang padakasusiniposisinyasedikitdigeser agar mempermudahperhitungan (denganmenambahkan 4,275)

  14. Hasil kurva anomali kordinat -6 yang di dapat setelah data processing • V(0) = -4,3 mV • xo = -0,217 meter • L(xi) = hasilpengukuranpotensial yang dianggap anomaly • q (silinder) = 1 (sesuaireferensimenurutBhatacharyadan Roy) merupakanordinatposisi yang padakasusiniposisinyasedikitdigeser agar mempermudahperhitungan (denganmenambahkan 4,18)

  15. Hasil survey Besar momen dipol yang didapat berupa minus, dalam hal ini dapat di asumsikan bahwa kedua anomali merupakan bahan mineral berbahan konduktor, diprediksiinimerupakansebuah drum.

  16. Self-potential signals associated with ground water flow (infiltration test from a ditch) • Acquisition

  17. Self Potential anomaly expected over water flowing into & out fracture zone • Self Potential anomaly expected over water flowing into fracture zone. Self Potential anomaly expected over water flowing into fracture zone.

  18. The Measured Self-Potential Signal (measured along profile 3)

  19. The Self-Potential Signal (perpendicular to the ditch)

  20. References • Sharma, Prem V., 2004, Environmental and Engineering Geophysics, Cambridge University Press, UK. • A. Boleve et al., A new formulation to compute self-potential signals associated with ground water flow, 2007, Hydrology and earth System Sciences Discussions. • Putri, Anggun K., Fenomena Self Potential danInterpretasinyaDenganMetoda least square, 2006, UniversitasNegeri Jakarta, Indonesia.

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