准噶尔南缘山前二维多波勘探近地表影响因素分析

doi:10.11720/wtyht.2019.1357

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Abstract

In Junggar basin,near surface structure is an obvious factor influencing seismic data.2D 3C seismic line data were collected recently at Gaoquan anticline of the mountain front area.Nevertheless,S/N of PS-wave section was obviously lower than P-wave section at the east end of 2D line.To verify and analyze near surface structure's influence on multi-wave 3C seismic data,the authors built forward model by using its near surface structure and well-logging data so as to get modeling shots with real acquisition geometry.By analysis of modeling results and near surface structure investigation,it is found that the thickness of low velocity layer increases and Xiyu conglomerates are developed at the east end of 2D line because of Kuitun River's sedimentation,which is the main reason of energy and S/N reduction of multi-wave seismic data.It is also proved that PS wave is more easily influenced by near surface structure's attenuation than P wave.

Key words： South Junggar Gaoquan anticline multi-wave exploration PS-wave near surface structure seismic forward modeling

Received: 28 September 2018 Published: 15 August 2019

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	Zhi-Guo CHENG
	Ting-Ting HU
	Ling-Yun WEI
	Hai-Yang GUO

Cite this article:

Zhi-Guo CHENG,Ting-Ting HU,Ling-Yun WEI, et al. Influence of near surface structure on multi-wave exploration at the mountain front of South Junggar Basin[J]. Geophysical and Geochemical Exploration, 2019, 43(4): 866-871.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2019.1357 OR https://www.wutanyuhuatan.com/EN/Y2019/V43/I4/866

Survey's structure and position map

Geometry parameters tab of 2D line A201719

PP(a) and PS(b) pre-stack migration section of A201719

Survey's satellite map

Near surface structure model of A201719

Typical PP and PS reflection amplitude versus offset

Seismic forward model information tab

P-wave Velocity section of forward model(a),PP wave stack section(b) and PS wave stack section(c)

Time-frequency analysis results of different time window of one shot at eastern part of A201719

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