The 3D seismic excitation techniques for the loess tableland areas in southern Ordos Basin
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摘要: 鄂尔多斯盆地南部黄土塬区是中国特有的地形地貌,巨厚黄土层弱弹性介质地震激发能量下传问题是地震数据采集的难题。中石化华北分公司经过多年的攻关与试验,对影响黄土塬地震资料品质的主要因素进行了深入分析,形成了一套黄土塬区激发关键技术——选取合理的激发点位、尽可能减少干燥疏松黄土对地震有效信息的吸收与衰减、选择合理的激发药型和激发参数增加子波的能量及拓展子波频带宽度、利用组合效应压制部分侧面干扰等。鄂尔多斯盆地南部黄土塬区三维地震采集关键技术的突破,结束了黄土塬区地震数据采集只能进行沿沟、谷进行二维弯线勘探的历史,使黄土塬区三维地震勘探成为可能。Abstract: The loess tableland areas in southern Ordos Basin are unique in topography and morphology in China. The downward propagation of earthquake-induced energy in the weakly elastic thick loess is believed to be one of the global problems in processing seismic information collections. The highlights in the present paper are placed upon the key 3D seismic excitation techniques such as the selection of the excitation sites, decrease of the effects of dry and loose loess on the absorption and attenuation of seismic information, selection of reasonable excitation explosives and excitation parameters in order to increase the wavelet energy and expand the width of the wavelet frequency band widths, and suppression of the local lateral interference with the aid of combination effects. The progress in the key techniques of the 3D seismic collection makes it possible to carry out the 3D seismic exploration in the loess tableland area in southern Ordos Basin.
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Keywords:
- loess tableland /
- excitation /
- optimal design /
- multi-well association /
- 3D seismic exploration
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