Prediction of marine clastic rocks assemblage with seismic waveform and amplitude responses:an example in Beikang Basin,South China Sea
Zhao Qian1, Zhou Jiangyu1, Zhang Li2, Lei Zhenyu2, Wang Longzhang1, Yan Congcong1
1. Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences(Wuhan), Wuhan, Hubei 430074, China; 2. Guangzhou Geological Marine Survey, Ministry of Land and Resource, Guangzhou, Guangdong 510760, China
Abstract：The identification and interpretation of sandstones and mudstones with the relationships between sedimentation and seismic response,and between seismic waveform and amplitude response is an important means of marine stratigraphic identification in under-explored areas.Combining these two relationships,we identify clastic rocks assemblage in the upper Miocene-lower Miocene sequences in the Beikang Basin.The following understandings are obtained:①There is a good coupling relationship between the sedimentary process of clastic rocks and seismic responses.②Seismic reflection interfaces correspond well to lithologic interfaces for thick sand and mudstone,but not for thin ones.Only thin bed thickness can be identified with seismic information,not its interfaces;Seismic response of thin inter-beds (sand,mudstone,clastic rocks) is prone to multiple solutions.③If geological body thickness is less than 1/4 wavelength,reflection waves of their tops and bottoms cause interference effects,these effects are the result of the interaction between wave impedance and strata thickness.Therefore,seismic response characteristics of sand,mudstone,and their inter-bed should be distinguished.④With seismic waveform and amplitude,and the difference of apparent impedance,high-precision lithofacies distributions can be established on seismic sections,which can provide reliable basis for hydrocarbon source rock and reservoir prediction.The proposed approach successfully applied in source rock and reservoir prediction in low exploration areas such as the South China Sea.
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