AVO analysis in gas hydrate exploration and the possibility of its application in deep water continental shelf of Vietnam
Abstract
AVO, which stands for Amplitude Variation with Off set - or more simply, Amplitude Versus Off set, is a seismic technique that looks for direct hydrocarbon indicators using amplitudes of prestack seismic data. The AVO technique became very popular in the petroleum industry, as one could physically explain the seismic amplitudes in terms of rock properties. For example, bright-spot anomalies (i.e. the high amplitude refl ections seen on the P-wave stacked section) could be investigated before stack to see if they also had AVO anomalies. It can help us distinguish the geological objects that created bright-spot anomalies, such as gas-bearing sandstones, coal seams or volcanoes.
AVO analysis proved successful in certain areas of the world for gas hydrate exploration but has not been applied in Vietnam. In this paper, the authors describe AVO analysis methods and some examples of using AVO in gas hydrate exploration in the world as well as the possibility to apply it in deep water areas on the continental shelf of Vietnam.
References
W.J.Ostrander. Plane-wave refl ection coeffi cients for gas sands at non-normal angles of incidence. Geophysics. 1984; 49(10): p. 1637 - 1648.
R.T.Shuey. A simplifi cation of the Zoeppritz equations. Geophysics. 1985; 50(4): p. 609 - 614.
K.Aki, P.G.Richards. Quantitative Seismology: Theory and methods. Freeman. 1980.
Richard Verm, Fred Hilterman. Lithology color-coded seismic sections: The calibration of AVO crossplotting to rock properties. The Leading Edge. 1995; 14(8): p. 847 - 853.
Steven R.Rutherford, Robert H.Williams. Amplitude-versus-off set variations in gas sands. Geophysics. 1989; 54(6): p. 680 - 688.
John P.Castagna, Steven W.Smith. Comparison of AVO indicators: A modeling study. Geophysics. 1994; 59(12): p. 1849 - 1855.
John P.Castagna, Herbert W.Swan. Principles of AVO crossplotting. The Leading Edge. 1997; 16: p. 337 -342.
G.C.Smith, P.M.Gidlow. Weighted stacking for rock property estimation and detection of gas. Geophysical Prospecting. 1987; 35: p. 993 - 1014.
Michael D. Max. Natural gas hydrate in oceanic and permafrost environments. Kluwer Academic Publisher. 2003.
Takashi Uchida. Methane hydrate: A future energy resource?. Technology Research Center. Japan Oil, Gas and Metals National Corporation. 2004.
Michael D.Max, Arthur H.Johnson, William P.Dillon. Economic geology of natural gas hydrate. Published by Springer. 2006.
P.Wang et al. Initial Reports. Proceedings of the Ocean Drilling Program. 2000.
Dianna Shelander, Jianchun Dai, George Bunge, Dan McConnel, Niranjan Banik. Predicting gas hydrates using prestack seismic data in deepwater Gulf of Mexico. AAPG Geoscience Technology Workshop, Houston, Texas. 16 March, 2010.
Hui Deng, Pin Yan, Hailing Liu, Wenzao Luo. Seismic data processing and the characterization of gas hydrate bearing zone off shore of Southwestern Taiwan. Terrestrial Atmospheric and Oceanic Sciences. 2006; 17(4): p. 781 - 797.
VGP. Seismic data processing and interpretation of Block 129-132 off shore Vietnam. 2010.
VGP. Complex marine geology-geophysical exploration of gas hydrate accumulations off shore Vietnam. 2011.
Thủ tướng Chính phủ. Quyết định v/v bổ sung Chương trình nghiên cứu, điều tra cơ bản về tiềm năng khí hydrate ở các vùng biển và thềm lục địa Việt Nam vào nhiệm vụ của “Đề án tổng thể điều tra cơ bản và quản lý tài nguyên - môi trường biển đến năm 2010, tầm nhìn đến năm 2020”. Quyết định số 1270/QĐ-TTg. 24/9/2007.
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