【作者】 马丽；

【导师】 李新虎； 朱芳香；

【作者基本信息】 西安科技大学 ， 地质工程， 2010， 硕士

【摘要】 随着大型综采设备被应用于煤炭开采,煤矿生产对巷道布置有了新要求、煤炭生产速度大幅提高,因此对煤层资料尤其是对煤层厚度资料有了更高的要求。以往采用的煤厚解释方法手段没有充分利用已有的地震、地质资料,为了提高对煤层厚度的解释精度,为煤炭生产提供更为准确的地质资料,本文引入波阻抗反演方法对煤层厚度进行预测。文章从介绍反演技术的基本方法入手,分别介绍了道积分反演、递推反演和模型反演三种主要反演方法及其优缺点。针对本次研究的重点,在文中侧重论述了测井约束反演中STRATA波阻抗反演方法,该方法有效地将测井资料垂向分辨率高的特点和地震资料横向分辨率高的特点有效结合起来,达到对煤层识别的目的。本次研究选择了三种不同地质条件下的三维地震资料进行STRATA反演:虎豹湾区煤层倾角小,构造简单;红果子区,煤层倾角大,构造一般;大佛寺区煤层倾角小,构造简单,煤层薄到特厚,煤层厚度变化大。通过测井资料预处理、层位解释、子波提取、层位标定、模型建立与修正、煤厚计算等一系列的分析与实践,得到了较为理想的波阻抗数据体及三个工区的煤层厚度变化趋势图。分析各个工区的实际情况及所得到的反演结果,认为当煤层与围岩存在明显波阻抗差异,有良好的地震反射记录时,STRATA反演都能取得良好的反演效果,当存在断层、褶皱等构造时,可以借助层位控制来解释该处的煤层厚度。更多还原

【Abstract】 With the large-scale mechanized mining equipment used in coal mining, coal thickness may affect the roadway layout and the progress of coal production. The previous interpretation of coal thickness without full use of existing seismic and geological data, In order to improve the accuracy of the interpretation of coal thickness, provide a more accurate geological information, especially the coal seam thickness, Here we introduce the impedance inversion method to predict coal thickness.This paper describes the basic method of inversion, include the integral inverse, recursive inversion and model inversion methods, and then introduced their advantages and disadvantages. Amang many logging constrained inversion methods,this paper discussed the STRATA wave impedance inversion method,which effectively combine high vertical resolution logging data and seismic data characterized in high lateral resolution together to achieve the purpose of identification of the coal seam.This study selected 3D seismic data of three different geological conditions to do wave impedance STRATA inversion: Hu Baowang Area, small seam angle, simple structure; Hong Guozi, dip seam angle, general structure; Da Fosi area,small angle of coal seam, Simple construction, thin to thick coal seams, high grade of coal seam thickness. By logging pretreatment, layer explaination, wavelet extraction, layer calibration, modeling and correction, coal seam thickness calculation,etc. a series of operations, We get some ideal wave impedance data and coal seam thickness trends of the three working areas. Analyzing the actual situation in each work area and the inversion results obtained, it is resulted that, STRATA inversion can get good quality result, only when the coal and rock have obvious difference in acoustic impedance, and have a good record of seismic reflection. If the fault and fold structures exist, we could explain the coal seam thickness by control layer .更多还原