Revision of P-wave velocity and thickness of hydrate layer in Shenhu Area,South China Sea |
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Authors: | Jianming Gong Xunhua Zhang Changchun Zou Qiang Chen Lichen Wang Chunfang Yuan Gaowei Hu Yubo Jiang |
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Affiliation: | 1. Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology, Qingdao Institute of Marine Geology, Qingdao, 266071, P. R. China 2. School of Geophysics and Information Technology, China University of Geosciences (Beijing), Beijing, 100083, P. R. China 3. College of Geoscience and Surveying Engineering, China University of Mining and Technology (Beijing), Beijing, 100083, P. R. China 4. College of Marine Geosciences, Ocean University of China, Qingdao, 266100, P. R. China
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Abstract: | To revise P-wave velocity and thickness of the hydrate layer in the Shenhu area of the South China Sea, acoustic and resistivity logging curves are reanalyzed. The waterlogging phenomenon is found in the shallow sediments of five drilling wells, which causes P-wave velocity to approximate the propagation velocity of sea water(about 1500 m s-1). This also affects the identification of the hydrate layer and results in the underestimate of its thickness. In addition, because there could be about a 5 m thick velocity ramp above or below the hydrate layer as interpreted by acoustic and resistivity logging curves, the recalibrated thickness of this layer is less than the original estimated thickness. The recalibrated P-wave velocity of the hydrate layer is also higher than the original estimated velocity. For the drilling well with a relatively thin hydrate layer, the velocity ramp plays a more important role in identifying and determining the thickness of the layer. |
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Keywords: | velocity ramp thickness hydrate layer Shenhu area |
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