Journal of Jilin University(Earth Science Edition) ›› 2019, Vol. 49 ›› Issue (1): 106-114.doi: 10.13278/j.cnki.jjuese.20180117

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Extension of Jiaolai Basin into Qianliyan Uplift in South Yellow Sea: New Evidence from OBS Deep Seismic Detection

Qi Jianghao1,2, Wu Zhiqiang1,2, Zhang Xunhua2,3, Hou Fanghui1,2   

  1. 1. Qingdao Institute of Marine Geology, China Geological Survey, Qingdao 266071, Shandong, China;
    2. Laboratory for Marine Mineral Resources, Pilot National Laboratory for Marine Science and Technology(Qingdao), Qingdao 266071, Shandong, China;
    3. Nanjing Center, China Geological Survey, Nanjing 210016, China
  • Received:2018-05-16 Published:2019-01-18
  • Supported by:
    Supported by National Natural Science Foundation of China (41210005 41606083),AoShan Technological Innovation Projects of National Laboratory for Marine Science and Technology (Qingdao) (2015ASKJ03), National Marine Geological Special Project (DD20160147),and National Marine Geological Survey Project (121201004000150013)

Abstract: In order to identify the eastern extension boundary of Haiyang sag to the South Yellow Sea (SYS), a deep seismic profile OBS2013-SYS was measured across the basin. 2D velocity structure modeling revealed a sudden increase of the seismic travel time in the OBSs(ocean-bottom seismometer)located in the Qianliyan uplift in the NW of the OBS profile. The velocity model shows that the sediments with low seismic velocity are obviously thickened in the offshore of Haiyang sag in the east of Jiaolai basin. From the station of OBS06 to the northwest, the sedimentary thicknesses markedly increase from less than 1.0 km to about 2.5 km:we speculated that it is the eastern boundary fault of Haiyang sag of Jiaolai basin. Combining with the analysis of the basin-controlling faults identified in Haiyang sag, we determined the general structure boundary and sedimentary center of Haiyang sag. We suggest that the eastern basin-controlling fault of Jiaolai basin may extend to the Lianyungang-Shidao fracture zone, which forms part of the north and the south boundary fault zone of the Qianliyan uplift with the Jiashan-Xiangshui-Qianliyan fault. The subsidence center of Haiyang sag may be located in the NE direction of Haiyang sag on the north side of the Lianyungang-Shidao fault in the South Yellow Sea area, and the developed thick Cretaceous may have good oil and gas prospect.

Key words: Jiaolai basin Haiyang sag, OBS deep seismic profile, new evidence, boundary fault, Qianliyan uplift

CLC Number: 

  • P736.1
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