(中南大學(xué) 地球科學(xué)與信息物理學(xué)院，長(zhǎng)沙 410083)
摘 要: 為有效探測(cè)深部礦體，研究地震波微弱信號(hào)增強(qiáng)技術(shù)至關(guān)重要。采用有限差分法，對(duì)不同震源激發(fā)方式產(chǎn)生的地震波場(chǎng)響應(yīng)進(jìn)行數(shù)值模擬。震源方向特征、單炮記錄和單道反射波的對(duì)比結(jié)果表明：相對(duì)于單震源和組合震源，相控震源可以明顯改變地震波場(chǎng)能量的分布，增強(qiáng)深部礦體微弱的反射信號(hào)。延遲參數(shù)不同，對(duì)微弱信號(hào)的增強(qiáng)能力也不同，可以根據(jù)需要設(shè)置合適的延遲參數(shù)。總體來說，相控震源可以為深部礦體勘探提供有利條件。
關(guān)鍵字: 深部礦體；相控；地震波；數(shù)值模擬；微弱信號(hào)
（School of Geosciences and Info-Physics, Central South University, Changsha 410083, China）
Abstract:To explore deep mineral resources effectively, the technology of improving weak signals is an essential technology for seismic waves. Finite-difference method was used for the numerical simulation of wave propagation and response of detector for different sources. By contrast of sources directional character, single shot records and single-channel reflected waves, the results show that phased array sources can change energy direction of seismic field obviously and enhance the reflected weak signals from deep mineral resources. For different delay parameters, the ability of improving weak signals is also different. Suitable delay parameters can be chosen in accordance with needs. On the whole, phased array sources can effectively improve the quality of seismic data from deep mineral resources.
Key words: deep mineral resources; phased array; seismic wave; numerical simulation; weak signals
