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The AAPG/Datapages Combined Publications Database

Ohio Geological Society



Structural Influences on Oil and Gas Reservoirs: Third Annual Technical Symposium, October 25, 1995

Pages 112 - 112


Bryan L. Roth, Roth Exploration Geoservices, Westerville, Ohio


The variety of Rose Run trap styles has outgrown simple interpretation on a black-and-white paper Previous HitseismicNext Hit section. A Rose Run remnant (or what looks like a remnant?) is easily identified with moderately good quality Previous HitseismicNext Hit data, but the critical details of the prospect remain concealed within the Previous HitseismicNext Hit data. The key to greater drilling success in the Rose Run play is to first understand the geology, relate the geology to the Previous HitseismicNext Hit data, and then interpret that data to exploit the concealed details within by using advanced Previous HitseismicNext Hit interpretation techniques.

The advanced Previous HitseismicNext Hit interpretation process begins with quality Previous HitseismicNext Hit acquisition and processing. Acquisition and processing should be designed on the signal and for high frequency content. The second step is to phase-correct the Previous HitseismicNext Hit data and, if applicable, enhance frequencies (whiten data) using interpretive wavelet processing that requires a sonic log. A sonic log provides reflection coefficients which are used to correct for phase (and reflection identification in wildcat areas). Once the correct phase is established, the amplitude spectra are analyzed for frequency range and balance. The amplitude spectra are easily whitened if the Previous HitseismicNext Hit data contain high frequencies and is not high-frequency cut. After identification and interpretation of key reflectors is complete, isochron graphing is compared to known geology and can indicate thickening or thinning of rock section at the Knox Unconformity. Next, analysis of individual reflectors is performed to enhance details in Previous HitseismicNext Hit waveform and amplitude. Waveforms exhibit different character with different frequencies and with different geology and can provide clues to formation thickness and geologic sequence. Detailed wavelet character is interpreted by understanding the relationship of the local geology to the Previous HitseismicNext Hit information, regional geology and the frequency content of the Previous HitseismicNext Hit data. Amplitude graphs support lithology interpretations and can indicate changes in reservoir porosity and fluid/gas content. Time picks from reflection interpretations are then used to construct time- structure maps of two or more Previous HitseismicNext Hit lines and show local and/or regional geological relationships between remnants. Time picks are also used to show 2-D Previous HitseismicNext Hit anomaly shapes and are interpreted for clues to paleotopography and remnant trends (important for guiding lease and Previous HitseismicNext Hit programs). Rose Run Previous HitseismicNext Hit anomalies typically exhibit a low-angle dip slope (backside) and an escarpment face (frontside). Finally, detailed Previous HitseismicNext Hit modeling is the answer for questions concerning Previous HitseismicNext Hit anomalies, detailed Previous HitseismicNext Hit character, and amplitude tuning.


  1. Do Previous HitseismicNext Hit acquisition and processing designed for a broad range frequency content.
  2. Phase-correct Previous HitseismicNext Hit data.
  3. Analyze amplitude spectra and whiten Previous HitseismicNext Hit data.
  4. Identify key reflectors.
  5. Integrate geology from local and/or regional wells.
  • Isochrons
  • Analyze individual reflections.
    • Waveform
    • Amplitude
  • Reconstruct paleotopography and geologic history.
    • Isochrons
    • Time-structure mapping
  • Do Previous HitseismicTop modeling of preferred stratigraphy.
  • Identify realizable stratigraphic traps.