四川松潘—阿坝低信噪比地区采集方法研究

The acquisition method in the region of low S/N in Sichuan Songpan-Aba area

四川松潘-阿坝地区地表条件和地下地质结构复杂,资料信噪比低。针对这一问题,从该地区的表层结 构、浅层强反射界面的屏蔽作用以及地下地质结构等方面分析了造成信噪比低的原因,提出了采用浮动井深、变 道距相关半径调查和净噪音能量分析等方法来选择最佳激发和接收因素;同时还探讨了药柱与岩性的几何耦合 和阻抗耦合对震源激发效果的影响,提出了应注意的问题和改善措施;在资料处理上,提出了采用近地表地震散 射噪声正反演法来消除散射噪音,采用复合多域去噪技术消除线性噪音、压制区域异常、剔除多次波等。以上方 法和措施大大提高了资料的信噪比,改善了资料的品质。

Because of the conditional complicacy in earth's surface and underground geology,exists a lot of low S/N area in seismic data acquisition, this paper is from the surface layer construction, shield the function and geologic framework, analyzed the low S/N compares the reason of the creation, put forward to the floating depth of hole, the unconvention-ality related radius investigates and research the match between the rock and the dynamite pillar, provide the powerful guarantee to choose the best factor of the explosion and the receive,The data processing proceed to discuss the inversion scattering noise attenuation and composite many ways wipe off noise. Effectively enhance the S/N, improve the data quality.