本文简要地介绍了两种绘图方法的原理、实现步骤及应用实例。对等厚图作趋势分析的结果,可以更细致地研究局部地区构造发展史和岩相古地理。文章认为,低阶次的趋势函数代表了区域性变化趋势,高阶次的趋势函数可以反映观测面的局部变化。但是,过高的阶次往往会产生假象,本文选用三阶次趋势函数,得到了较好的结果。 This article briefly introduces the principle of two kinds of drawing methods, implementation steps and application examples. As a result of the trend analysis of isopachograms, the development of local tectonic structures and lithofacies paleogeography can be studied in more detail. The article holds that the low order trend function represents the trend of regional change, and the high order trend function can reflect the local change of observation surface. However, too many orders tend to produce illusion. In this paper, we choose the third order trend function and get better results.