SHALLOW WATER MULTIPLES DEPRESSION AND IMAGING ANALYSIS ON THE LAOSHAN UPLIFT OF THE SOUTH YELLOW SEA BASIN

LIU Jun; WU Shuyu; CHEN Jianwen; SHI Jian; LEI Baohua

doi:10.16562/j.cnki.0256-1492.2017.03.011

Marine Geology & Quaternary Geology > 2017 > 37(3): 111-119. > DOI: 10.16562/j.cnki.0256-1492.2017.03.011

LIU Jun, WU Shuyu, CHEN Jianwen, SHI Jian, LEI Baohua. SHALLOW WATER MULTIPLES DEPRESSION AND IMAGING ANALYSIS ON THE LAOSHAN UPLIFT OF THE SOUTH YELLOW SEA BASIN[J]. Marine Geology & Quaternary Geology, 2017, 37(3): 111-119. DOI: 10.16562/j.cnki.0256-1492.2017.03.011

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SHALLOW WATER MULTIPLES DEPRESSION AND IMAGING ANALYSIS ON THE LAOSHAN UPLIFT OF THE SOUTH YELLOW SEA BASIN

LIU Jun^1,2,3,,
WU Shuyu^1,2,
CHEN Jianwen^1,2,
SHI Jian^1,2,
LEI Baohua^1,2

1.
The Key Laboratory of Marine Hydrocarbon Resources and Environment Geology, Ministry of Land and Resource, Qingdao Institute of Marine Geology, Qingdao 266071
2.
Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071
3.
Faculty of Earth Resource, China University of Geosciences, Wuhan 430074

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Received Date: April 20, 2016
Revised Date: July 11, 2016

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Abstract

Abstract

The boundary between the Ceno-Mesozoic clastic deposits and the underlying Palaeozoic carbonate is a strong reflection interface on the Laoshan Uplift of the South Yellow Sea Basin. It acts as a strong shield to prevent the seismic waves from propagation downward, in addition to the multiples in the sea. As the results, deep seismic reflections are usually weak and difficult to image. Furthermore, there is lack of nearly offset reflected signals from seabed in shalloow water, the seabed related multiples can not be depressed effectively by conventional SRME (Surface Related Multiple Elimination) method. The Taup domain predictive deconvolution method always destroy valid reflected signals if the wave cycle is similar to the seabed multiple, particularly if the seabed is hard. The amplitude of the seabed multiple wave energy is stronger than the seabed reflection. In this case, the method of predictive deconvolution can not be used to depress seabed related multiples entirely. In this paper, seabed related multiples wave depression is performed by using the DWD + SRME combination method. DWD (Deterministic Water-layer Demultiple) method is used for attenuating short period seabed related multiples, and the SRME method is used for suppressing long period free surface related multiples. In addition, the method of Radon transform is also used for remove inter-layer multiples, so the multiples are depressed effectively, and thus deep reflection signals appear gradually. Trough the above mentioned seismic processing it is revealed that the Laoshan Uplift is a gentle anticline structure, and there are multiple thrust faults cutting through it. The Laoshan Uplift was embryonic in the Caledonian stage, formed in the Indosinian period and matured in the Yanshan period.
- shallow water,
- multiples wave,
- DWD+SRME method,
- Radon transform,
- South Yellow Yea Basin,
- Laoshan Uplift

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References (25)

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