SHALE GAS POTENTIAL ANALYSIS IN KUTAI BASIN, EAST KALIMANTAN BASED ON 2D INVERSION OF MAGNETOTELLURIC DATA

• Main Author: DINI PRATIWI (NIM : 10214043), ISTIQOMAH
• Format: Final Project
• Language: Indonesia
• Subjects: Fisika
• Online Access: https://digilib.itb.ac.id/gdl/view/28168
• Institution: Institut Teknologi Bandung

Non-conventional oil and gas resources, such as shale oil and gas is one of the biggest natural resource in Indonesia. Indonesia is having a larger amount of shale gas potential than the conventional gases. Kutai basin, which is located in East Kalimantan is known as the area of shale gas in Indonesia. To understand the shale gas potential in Kutai basin, we have to conduct a geophysics survey that will provide information about geological structure under the surface. Magnetotelluric method is a branch of geophysics survey that has been widely used in oil and gas exploration. This method is using Earth’s electromagnetic wave to mapping the subsurface structure. However, this method is quiet sensitive to electromagnetic noise that will lead to poor data quality. In this research, it is proved that robust processing, time series analysis, local reference analysis, and cross power selection were able to improve the magnetotelluric data quality (indicated by an increasing coherence value and the smoothness of apparent resistivity and phase curve). Furthermore, according to the result of 2D inversion it is estimated that the existence of black shale with meta-anthracite maturation stage caused a low resistivity anomaly under the surface. Moreover, based on the result of 1D and 2D inversion it is known that TE (Transverse Electric) mode is more sensitive to conductive structures, while TM (Transverse Magnetic) mode is more sensitive to resistive structures.