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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2011.1
- 수록면
- 59 - 64 (6page)
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초록· 키워드
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Q-factor (or Q) that quantifies the attenuation, the intrinsic property of the material, is a very important required factor in extracting useful subsurface material properties such as lithological information, porosity, permeability, viscosity,and the degree of the saturation from the seismic data. When seismic energy propagates through the gas hydrate-bearing zone and a free gas layer below it, the considerable attenuation occurs and affects the amplitude and wavelet shape of recorded seismic data. Thus Q- factor extracted from seismic data can be used to locate the gas hydrate bearing zone and estimate its reserves. The spectral-ratio method has been widely used in computing the frequency-independent Q’s from the zero-offset VSP data because of its ease and fastness. We developed a module of the spectral ratio method, and applied it to the synthetic zero-offset VSP data set and field zero-offset VSP data set. The field data were acquired at Mallik 3L-38 gas hydrate research well in Canada. The Q-factors calculated from the synthetic zero-offset VSP data using the spectral ratio method approached closer to the true values for the medium with low Q-factor than high Q-factor. The changes in the Q-factors extracted from the Mallik zero-offset data using the spectral ratio method agreed well with the boundaries of the layers, including gas hydrate zone, depicted in a reflection image.
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참고문헌 (8)
참고문헌 신청
Dallimore, S.R / 2005 / Summary and implications of the Mallik 2002 Gas Hydrate Production Research Well Program / Geological Survey of Canada, Bulletin 1:585~36
De Gopa, S. / 1994 / Comparison of P- and S-wave velocities and Q’'s from VSP and sonic log data / Geophysics 59:1512~1529
Jeng, Y. / 1999 / An improved method of determining near-surface Q / Geophysics 64(5):1608~1617
Milkereit, B. / 2005 / Multi-offset vertical seismic profiling: an experiment to assess petrophysical-scale parameters at the JAPEX/JNOC/GSC et al. Mallik 5L-38 gas hydrate production research well / Geological Survey of Canada, Bulletin 585
Pramanik, V.S. / 2000 / Estimation of Q from borehole data and its application to enhance surface seismic resolution: A case study: 70th Ann. Internat / 70th Ann. Internat. Mtg., Soc. of Expl. Geophys :2013~2016
De Gopa, S. / 1994 / Comparison of P- and S-wave velocities and Q’'s from VSP and sonic log data / Geophysics 59:1512~1529
Jeng, Y. / 1999 / An improved method of determining near-surface Q / Geophysics 64(5):1608~1617
Milkereit, B. / 2005 / Multi-offset vertical seismic profiling: an experiment to assess petrophysical-scale parameters at the JAPEX/JNOC/GSC et al. Mallik 5L-38 gas hydrate production research well / Geological Survey of Canada, Bulletin 585
Pramanik, V.S. / 2000 / Estimation of Q from borehole data and its application to enhance surface seismic resolution: A case study: 70th Ann. Internat / 70th Ann. Internat. Mtg., Soc. of Expl. Geophys :2013~2016
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