Role of the Wide-angle OBS Seismic Exploration in the Research of Marine Sedimentary Basin
First author:Xia Shaohong(1981-),male,Jingzhou City, Hubei Province,Professor.Research areas include marine geophysics and deep tectonics of continental margin.E-mail:shxia@scsio.ac.cn
作者简介:夏少红(1981-),男,湖北荆州人,研究员,主要从事海洋地球物理与大陆边缘深部构造研究.E-mail:shxia@scsio.ac.cn
Received date: 2016-08-02
Revised date: 2016-10-15
Online published: 2016-11-20
Supported by
Project supported by the National Natural Science Foundation of China “Three-dimensional active-source seismic tomography of crust in northeastern South China Sea and its constraints in magmatism and tectonics”(No.91328206)and “The deep crustal structure and its tectonic response of the Qingdongnan Basin in the northwestern SCS”(No.41576041)
Copyright
Marine sedimentary basin is an important tectonic unit in the earth, and the evolution of marine sedimentary basin involves a series of the coupling and evolution of geodynamic mechanism such as the crust-mantle, the lithosphere-asthenosphere, the strata-fluid deposition. Therefore, the study of marine sedimentary basin dynamics includes deep structure state of earth, material composition and regional tectonic evolution, and also internal structure, tectonic characteristics and pore fluid characteristics strata of the basin. Wide angle Ocean Bottom Seismometer (OBS) seismic exploration is a marine geophysical survey method originated and developed since 1980’s and 1990’s, which has the advantages of strong penetration capability, high seismic imaging precision and reception of both P-wave and S-wave, and playing an increasing significant role in the research of marine sedimentary basin at the aspect of regional tectonic evolution, internal structure and pore fluid development characteristics of strata in recent years. In the study of passive continental margin, the crustal structure acquired from wide angle OBS seismic data provides the direct evidence that divides the passive continental margins into magma-poor and magma-dominated ones, and the degree of thinning and spatial variation characteristics of crust provide constraints for dynamics simulations of tectonic evolution in marine sedimentary basin. In the study of the structure features of basin, wide angle OBS seismic exploration fills in gaps at the aspect of investigation depth and complex geological structure in conventional multi-channel seismic survey, and acquires overpressure distribution status of basin according to the velocity structure characteristics of strata, and then infer the basin sedimentation velocity and pore fluid characteristics. In the study of internal fluid system in marine sedimentary basin, it reveals the velocity structure of natural gas hydrate reservoir through the analysis and processing of wide angle OBS seismic data, and calculates the thickness of natural gas hydrate reservoir and the content of hydrate and free gas in pore based on the velocity variation. Of course, the future wide angle OBS seismic exploration in the aspect of dynamic evolution and mechanism research in marine sedimentary basin will play a more important role with the development of marine seismic exploration technology, the improvement of data processing and instrument parameters.
Shaohong Xia , Jinghe Cao , Kuiyuan Wan , Chaoyan Fan , Jinlong Sun . Role of the Wide-angle OBS Seismic Exploration in the Research of Marine Sedimentary Basin[J]. Advances in Earth Science, 2016 , 31(11) : 1111 -1124 . DOI: 10.11867/j.issn.1001-8166.2016.11.1111
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