Integration of Both Low Frequency Passive Seismic



The Tebing Block is one of the unexplored areas in South Sumatra Basin. Recently, exploration activity at this area has followed the classical pattern of investigating sub-surface anticlinal structures and/or carbonate buildups. The basin has been proven to contain moderately large accumulations of HC trapped in faulted and anticlinal structures of TAF, GUF, ABF, and MEF as well as carbonate buildups in BRF. The last exploration drilling well in the block, named Semi-1 (dry), has been base on the BRF carbonate buildup reservoir target. No tested on the TAF sand or basement fracture. Passive seismic application for hydrocarbon exploration is a new method in Indonesia. Passive seismic, also known as micro-seismic, is based on the non-linear principles of fluid system in a porous media. Hydrocarbons in porous reservoir can be detected as spectrum anomaly of low frequency ranging from 0.2 to 6.0 Hz. The amplitude anomaly at low frequency is occurred as result of natural earth noise and self-frequency of the reservoir containing HC maximum oscillation. The larger amplitude at low frequency will be detected only above a hydrocarbon reservoir and small amplitude at others. These low frequency micro-seismic signals was recorded passively on the surface using highly sensitive seismometers (minimum 2000 V/m/s), and then analyzed to produce spectrum anomaly, which can be used as hydrocarbon presence indicators. The integration of low frequency spectrum analysis of passive seismic and 2D seismic interpretation has successfully identify and recognize the location of hydrocarbon accumulation in the south-western and eastern part of the block. By using time reverse modeling (TRM), it’s identified that the depth of hydrocarbon accumulation refers to Talang Akar Formation at south-west and pre-tertiary basement fracture in the east. This study and its result, give a new meaning and life for the Tebing Block. After years of no activities, a new prospect was effectively generated with significant amount of potential recourses.

Keywords: Passive Seismic, 2D Seismic, Spectrum Analysis, Time Reverse Modeling.


Authors : M. J. Panguriseng, T. K. Usman, I. Yuliandri, W. S. Sadirsan, D. Priambodo, Wahyudi, W. Suryanto