可控震源地震采集技术在H探区煤炭勘查中的实验

doi:10.11720/wtyht.2020.1003

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Abstract

The H exploration area is located in the northeast of the Tulu-Tuomatan basin.Its geomorphology is desert and gobi.The climate in the area is dry,the plants are poorly developed,and the ecological conditions are very fragile.The surface is dominated by gravel and sub-sand layers,its thickness is large and the latent water level is deep.The choice of reasonable acquisition technology and parameters is the premise of seismic work and the key to ensuring seismic exploration results.Firstly,the feasibility of using vibroseis in this area was analyzed according to the seismic and geological conditions of the exploration area.Then,the selection of the vibrating parameters of the vibrator was tested,and the excitation parameters such as vibration number,scanning length,scanning frequency,and source output were determined.Referring to the experience of seismic exploration in adjacent areas,the authors chose the linear combination of multiple geophones and the observation system with high coverage times.The vibroseis technology was adopted,the selected acquisition parameters were finely constructed,and the better seismic effect was obtained,which provides valuable reference for the future seismic exploration of coal fields in similar areas.

Key words： Tulu-Tuomatan basin vibroseis parameter test

Received: 21 February 2019 Published: 03 March 2020

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	Hai-Chuan SUN

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Hai-Chuan SUN. Experimental study of vibroseis seismic acquisition technology on coal exploration in H prospecting area[J]. Geophysical and Geochemical Exploration, 2020, 44(1): 42-49.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2020.1003 OR https://www.wutanyuhuatan.com/EN/Y2020/V44/I1/42

Contrast of vibration number test single-shot record (above),SNR,energy analysis(middle)and spectrum analysis(below)

Contrast of vibration times test single-shot record (above),SNR,energy analysis(middle)and spectrum analysis(below)

Comparison single-shot record spectrum analysis of scanning high frequency 130 Hz and 110 Hz

Contrast of scanning length test single-shot record (above),SNR,energy analysis(middle)and spectrum analysis(below)

Seismic time section of H exploration area

Statistical table for borehole validation

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