薛野, 刘田田. 贵州织金浅煤层地震勘探技术的实践与认识[J]. 煤田地质与勘探, 2018, 46(4): 161-167. DOI: 10.3969/j.issn.1001-1986.2018.04.026
引用本文: 薛野, 刘田田. 贵州织金浅煤层地震勘探技术的实践与认识[J]. 煤田地质与勘探, 2018, 46(4): 161-167. DOI: 10.3969/j.issn.1001-1986.2018.04.026
XUE Ye, LIU Tiantian. The practice and understanding of seismic exploration technology of shallow coal seams in Zhijin area, Guizhou Province[J]. COAL GEOLOGY & EXPLORATION, 2018, 46(4): 161-167. DOI: 10.3969/j.issn.1001-1986.2018.04.026
Citation: XUE Ye, LIU Tiantian. The practice and understanding of seismic exploration technology of shallow coal seams in Zhijin area, Guizhou Province[J]. COAL GEOLOGY & EXPLORATION, 2018, 46(4): 161-167. DOI: 10.3969/j.issn.1001-1986.2018.04.026

贵州织金浅煤层地震勘探技术的实践与认识

The practice and understanding of seismic exploration technology of shallow coal seams in Zhijin area, Guizhou Province

  • 摘要: 贵州织金地区二叠系龙潭组煤层连片稳定分布、累计厚度大,为中高阶煤煤层气重点有利目标区;但主力煤层地震反射资料信噪比低、剖面成像效果差,制约了该区煤层气勘探开发工作。工区内灰岩大面积裸露、目的层埋藏浅是导致该区地震资料信噪比低的最主要因素。实践表明:基于数字盒子波调查的模拟检波器多道组合接收技术具有较好的噪声压制效果,基于煤层反射最大信噪比的岩性-井深-药量匹配激发技术提高了地震激发效率,宽线观测、小道距数字检波道组合技术是改善二维地震成像的有效方法,小道距、小线距、高炮密度及高横纵比的三维地震观测技术显著提升了煤层资料品质。该技术系列适用于山地灰岩出露地区浅煤层地震采集。

     

    Abstract: Seismic data from Zhijin area have the characteristics of low signal-to-noise ratio, poor consistency of events, restricting the exploration and development of coalbed methane. The extensively distributed carbonate and shallow burial depth of Longtan Formation of Permian are the main causes for the poor seismic imaging quality. Practice shows that the multiple channel array receiving technology of analog geophones, based on digital box wave survey, had good noise suppression effect, the excitation technology matched with lithology, well depth and charge mass, based on the maximum SNR of coal seam reflection, enhanced the seismic excitation efficiency, observation of broad lines, configuration technique of geophone traces with small interval were the effective methods to improve 2D seismic imaging, 3D seismic observation technology with small trace interval, small line interval, dense shooting and high horizontal-vertical ratio enhanced significantly the quality of seam data. The technology is suitable for seismic acquisition of shallow coal seams in mountainous limestone-exposed areas.

     

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