Application of AVO attribute inversion technology to gas hydrate identification in the Shenhu Area,South China Sea |
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| Institution: | 1. MARUM, University of Bremen, Klagenfurter Str., 28359 Bremen, Germany;2. IFREMER, Département REM, Unité des Géosciences Marines, F-29280 Plouzané, France;3. TOTAL, Pau, France;4. Nigeria Institute for Oceanography and Marine Research, Nigeria;5. Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW 2109, Australia;1. CAGE-Centre for Arctic Gas Hydrate, Environment and Climate, Department of Geology, UiT – The Arctic University of Norway, PO Box 6050 Langnes, N-9037, Tromsø, Norway;2. Huffington Department of Earth Sciences, Southern Methodist University, PO Box 750395, Dallas, TX, 75275, USA;1. Guangzhou Marine Geological Survey, Guangzhou, 510075, China;2. Geotek Ltd. United Kingdom, Daventry, NN118PB, UK;3. China University of Geosciences, Beijing, 100083, China |
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| Abstract: | AVO (Amplitude Versus Offset) is a seismic exploration technology applied to recognize lithology and detect oil and gas through analyzing the feature of amplitude variation versus offset. Gas hydrate and free gas can cause obvious AVO anomaly. To find geophysical evidence of gas hydrate and free gas in Shenhu Area, South China Sea, AVO attribute inversion method is applied. By using the method, the multiple seismic attribute profiles and AVO intercept versus gradient (I-G) cross plot are obtained. Bottom-simulating reflector (BSR) is observed beneath the seafloor, and the AVO abnormal responses reveal various seismic indicators of gas hydrate and free gas. The final AVO analysis results indicate the existence of gas hydrate and free gas in the upper and lower layers of BSR in the study area. |
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| Keywords: | Gas hydrate AVO Attribute inversion BSR Free gas |
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