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《Journal of Marine Sciences》 2010-04
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Characteristic and formation cause of anomalous reflection on Oligocene and Miocene transition in Xihu Depression,East China Sea Basin

SU Cheng 1,LI Chun-Feng 2,GE He-ping 3(1.Department of Earth Sciences,Zhejiang University,Hangzhou 310027,China;2.State Laboratory of Marine Geology,Tongji University,Shanghai 200092,China;3.CNOOC China Limited-Shanghai,Shanghai 200030,China)  
Twenty-one anomalous reflectors on Oligocene and Miocene transition in Xihu Depression,East China Sea Basin were found by detailed explaining seismic information.The formation cause and evolutionary process of the anomalous reflectors with the geological background was analyzed and discussed,and the comparison with the gravity and magnetic data was also carried.The results showed that these anomalous reflectors in south Xihu Depression are more than in north and distribute individually,they have a great porosity and the same size basically,their densities are higher than those in Cenozoic sediment and lower than those in Mesozoic rocks,their reflectance signatures on seismic profile are changing from bottom like igneous rock to up like sediment.In order to reasonably explain anomalous reflectors,this paper inferred that the anomalous reflectors were Miocene igneous rock,and then covered by sediment after weathered and denuded in the surface.By analyzing the evolution of the anomalous reflectors,it was suggested that there is a number of oil and gas in them,and indicated the continental shelf in East China Sea is instability in the Oligocene and Miocene transition period.
【Fund】: 国家自然科学基金资助项目(40504016、40621063、40776026);; 国家重点基础研究发展计划资助项目(2007CB411702)
【CateGory Index】: P736.15
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