The Use of Novel Passive Seismic Method in West Java, Sub Jatibarang Basin
Author: Bayu Dwijatmiko, David Pambudi Sahara, Magfirah Rajab, Muhammad Oktama Aulia Akbar*
muhammad.oktama@pertamina.com
Recently, low-frequency passive seismic is commonly used as an alternative method for detecting the occurrence of hydrocarbons in the reservoir. Compared to active seismic, it has the advantages of providing indication of hydrocarbon occurrences with significantly lower budget and processing time. Low-frequency passive seismic method analyzes the peak signal with a frequency range of 1-5 Hz which indicates the presence of a prospective hydrocarbon reservoir. An extensive survey was carried out at 497 points in the Kandanghaur area, SubJatibarang Basin, an oil and gas field in West Java. Three-component broadband borehole seismometer from Geobit was used to record the microtremor signals. One of the attributes used for analysis is Power Spectral Density (PSD) which will focus on the recorded signal on the vertical component and frequency at around 3 Hz. A calibration test showed promising measurement which reveal a high spectrum of peak amplitude near the production wells. It indicates that the passive seismic could be used a proxy of a good potential reserve indicator. From attribute map, we get a promising area to be develop outside the existing production area. Moreover, a high correlation value is generated between the attributes of passive seismic and hydrocarbon reserves of some proven wells. It highlights that passive attributes can be integrating as additional information to conventional methods such as active seismic data for location new drilling wells and can become another breakthrough of a proven hydrocarbon exploration method.
Keywords: Low-frequency passive seismic, Power Spectral Density
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