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Gaining a thorough understanding of the subsurface structure in volcanic rock areas is crucial to improving the assessment of risk and uncertainty in oil and gas development. However, when large areas need to be examined, it can get expensive to map the main features of the geological layers. The utilization of passive seismic as an alternative method in exploration activities could serve as a potential solution to the high cost of measurements. Over a two-month period, seventy stations were recorded in a configuration of two intersecting lines, with thirty-five stations on each line. This work presents a technique that employs the horizontal-to-vertical spectral ratio (H/V) of single-station noise recording analysis to image subsurface structure by identifying impedance contrasts. The difference between the initial H/V spectrum and the smooth H/V spectrum at each measurement point is used to calculate the S-Wave impedance contrast. Lateral interpolation is done on each line to create a cross section. The processing results obtained from the two lines of this method suggest the existence of a thrust fault structure, which could be responsible for the observed surface structure in this region which could be related to the petroleum system that works in this region.

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The Extraction of S-Wave Contrast Impedance from the H/V Spectral Ratio of Seismic Noise at the Cipari Structure in Cilacap, Central Java, Indonesia

  • 会议论文

  • 发表日期：

    2026年

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  • Firman Syaifuddin,
  • Dwa D. Warnana,
  • Amien Widodo,
  • Wien Lestari,
  • Juan P. G. N. Rochman,
  • Eki Komara,
  • Pongga Wardaya,
  • Erlangga Septama,
  • Suherman,
  • Totong Usman,
  • Marjiyono,
  • J. B. Januar H. Setiawan,
  • G. M. Lucki Junursyah,
  • Hdayat,
  • Ahmad Setiawan,
  • Nimas N. Namidah,
  • Shofi I. Hawan,
  • Robby Setianegara,
  • Andrian Ibrahim

摘要

Gaining a thorough understanding of the subsurface structure in volcanic rock areas is crucial to improving the assessment of risk and uncertainty in oil and gas development. However, when large areas need to be examined, it can get expensive to map the main features of the geological layers. The utilization of passive seismic as an alternative method in exploration activities could serve as a potential solution to the high cost of measurements. Over a two-month period, seventy stations were recorded in a configuration of two intersecting lines, with thirty-five stations on each line. This work presents a technique that employs the horizontal-to-vertical spectral ratio (H/V) of single-station noise recording analysis to image subsurface structure by identifying impedance contrasts. The difference between the initial H/V spectrum and the smooth H/V spectrum at each measurement point is used to calculate the S-Wave impedance contrast. Lateral interpolation is done on each line to create a cross section. The processing results obtained from the two lines of this method suggest the existence of a thrust fault structure, which could be responsible for the observed surface structure in this region which could be related to the petroleum system that works in this region.