薄层复合波振幅与厚度函数关系的改进  

Improvement of function between thin-bed composite amplitude and its thickness

作　　者：苑春方[1,2] 彭苏萍[1,2] 唐申强 孙喆[1] 江微娜 

机构地区：[1]中国矿业大学(北京)地球科学与测绘工程学院,北京100083 [2]中国矿业大学(北京)煤炭资源与安全开采国家重点试验室,北京100083

出　　处：《煤炭学报》2014年第10期2083-2086,共4页Journal of China Coal Society

基　　金：国家重点基础研究发展计划(973)资助项目(2009CB724601);国家自然科学青年基金资助项目(4120223B);国家科技支撑计划课题资助项目(2012BAB13B01)

摘　　要：薄层厚度的定量预测方法一直是地球物理学家研究的热点问题之一。预测主要是通过建立薄层厚度与地震反射波振幅、频谱、地震属性之间的关系,进而直接或间接地预测薄层厚度。这种函数关系依赖于选取的地震子波的特性。已有的研究成果中选用的地震子波基本上是实际地震子波的近似,由于子波的误差不可避免地会影响函数关系的精度。选取更为接近实际情况的黏弹性波解作为地震子波,建立了薄层顶底反射的复合波振幅与厚度的一阶近似关系,与Widess的近似关系相比具有更高的精度。The quantitative prediction of thin-bed thickness is the one of important problems of the geophysicist＇ s re- search. These methods is often implemented through establishing the relationships between thin-bed thickness and seis- mic dominant amplitude ,frequency or other attributes, and then used to directly or indirectly predict thin-bed thick- ness. These relationships are always dependent on the characteristics of selected seismic wavelet, which is an approxi- mation of realistic wavelet. However, the calculation of selected wavelets is subject to the influence of seismic data quality and its accuracy is not sufficient. A more realistic wavelet was presented in this paper using the solution of vis- coelastic wave equations. The first order approximation formula was established to describe the relationship between the thin-bed thickness and the amplitude of compound seismic waves reflected from top and bottom of thin-bed. Compared with the Widess＇ s method,the proposed method has a higher precision.

关 键 词：复合波振幅 厚度预测 薄层 地震 黏弹性介质 

分 类 号：P631.4[天文地球—地质矿产勘探]