截断高斯模拟与沉积特征在煤系含隔水层三维空间分布的应用研究

Application Resarch on the 3D Space Distribution of Truncated Gaussian Simulation and Sedimentary Characteristics in the Coal-measures Bearing Aquiclude

本文引入截断高斯模拟与沉积物源的概念,对煤系上覆含水层进行分类、分相的分析,以便于摸清其富水性及其三维空间分布,通过对变差函数的拟合,将物源方向与其结合;优化主次变程值,使模拟值与实际值拟合得到研究区4种岩相所对应的变差函数。最终应用截断高斯模拟,在钻孔资料结合地质认识的基础上,建立三维含隔水层模型,经过验证,该模型结果与实际揭露相符。这种方法克服了二维图件描述的局限性,实现了地质认识与数学方法的结合,有利于煤系含隔水层非均质性的研究。

This research introduced the concept of truncated gaussian simulation and sediment source to analyze the coal-meas- ures overlying bearing aquicludes by the classification and parvafacies, so that the rich aqueous and the 3D space distribution were discovered. Through fitting the variogram function, it was combined with the material source direction. And optimizing the primary and secondary variation value, the simulation value and actual value were fitted to obtain the corresponding ratio- gram functions of four kinds of parvafacies in the research area. Finally, by using the truncation gaussian simulation, the 3D bearing aquiclude model was established on the basis of the drill-hole data combining with geological understanding. The model results were consistent with the actual disclosure results by verification. This method overcame the limitation of 2D image de- scription and realized the combination of geological understanding and mathematical method, which was beneficial to the study on the heterogeneity of coal-measures bearing aquiclude,