基于特征值相干体属性煤田三维地震勘探小断层解释  

Coalfield small fault interpretation explored by three-dimensional seism based on eigenvalue coherent body properties

作　　者：李亮 刘毅 杜磊 Li Liang;Liu Yi;Du Lei(Shaanxi Coalfield Geophysical Surveying and Mapping Co.,Ltd.,Xi’an 710005,China)

机构地区：[1]陕西省煤田物探测绘有限公司,陕西西安710005

出　　处：《煤炭与化工》2022年第11期42-44,共3页Coal and Chemical Industry

摘　　要：为了提高煤田三维地震勘探小断层解释精度,本文通过对比分析3种不同方法的相干体算法及其特点,重点介绍了基于特征值原理相干体算法原理,并采用实际三维地震资料对3种相干体算法进行测试分析。测试结果表明,基于特征值原理的相干体属性对小构造反映效果较好且分辨率高;其次是基于多道相似性原理的相干体属性,但其分辨率相对较低;基于互相关原理的相干体属性对小构造反映效果不明显。同时利用实际三维地震资料,对基于特征值原理的相干体算法的主要参数进行了测试和分析,测试结果表明,参与计算道数越多,其分辨率越低,一般情况下推荐参与计算道数为3道;测试结果还表明参与计算纵向时窗越长,其分辨率越低,一般情况下推荐参与计算纵向时窗约为半个地震波长到1个地震波长。In order to improve the interpretation accuracy of small faults in coalfield three-dimensional seismic exploration,this paper compared and analyzed the coherent body algorithms and their characteristics of three different methods, focused on the principle of coherent body algorithm based on eigenvalue principle, and used the actual three-dimensional seismic data to test and analyze the three coherent body algorithms. The test results showed that the coherent body properties based on the eigenvalue principle had good reflection effect and high resolution on small structures. The coherent body properties based on multi-channel similarity principle had the secondly good reflection effect, but its resolution was relatively low;the coherent body properties based on the cross-correlation principle had no obvious effect on the small structure. At the same time, the main parameters of the coherent body algorithm based on the eigenvalue principle were tested and analyzed by using the actual three-dimensional seismic data. The test results showed that the more the number of channels involved in the calculation, the lower the resolution. In general, it was recommended to use three channels in the calculation. The test results also showed that the longer the longitudinal time window involved in the calculation, the lower the resolution. In general, the recommended longitudinal time window for calculation was half to one seismic wave length.

关 键 词：三维地震 小断层 相干体 

分 类 号：TD74[矿业工程—矿井通风与安全]