Enhancement of subsurface geologic structure model based on gravity, magnetotelluric, and well log data in Kamojang geothermal field

6th ITB International Geothermal Workshop

Kamah, Muhammad Yustin^1 ; Armando, Adilla^1 ; Rahmani, Dinda Larasati^1 ; Paramitha, Shabrina^1

Upstream Technology Center, PT Pertamina (Persero), Jakarta, Indonesia^1

关键词: Energy exploration;    Euler deconvolution;    Geologic structures;    Geophysical methods;    Geothermal systems;    Inverse modeling;    Magnetotelluric methods;    Subsurface geology;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/103/1/012013/pdf
DOI  :  10.1088/1755-1315/103/1/012013

来源: IOP

【 摘 要 】

Geophysical methods such as gravity and magnetotelluric methods commonly used in conventional and unconventional energy exploration, notably for exploring geothermal prospect. They used to identify the subsurface geology structures which is estimated as a path of fluid flow. This study was conducted in Kamojang Geothermal Field with the aim of highlighting the volcanic lineament in West Java, precisely in Guntur-Papandayan chain where there are three geothermal systems. Kendang Fault has predominant direction NE-SW, identified by magnetotelluric techniques and gravity data processing techniques. Gravity techniques such as spectral analysis, derivative solutions, and Euler deconvolution indicate the type and geometry of anomaly. Magnetotelluric techniques such as inverse modeling and polar diagram are required to know subsurface resistivity charactersitics and major orientation. Furthermore, the result from those methods will be compared to geology information and some section of well data, which is sufficiently suitable. This research is very useful to trace out another potential development area.