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提出了一个广义“断层转折褶皱”的几何学数值模拟方法,并用C++语言编制了相应的数值模拟软件。该软件能模拟非常复杂的褶皱冲断系统,包括多转折“剪切断层转折褶皱”(multi-bend sbear fault-bend folds)、复合楔体构造(composite wedge structares)、以及多滑脱层褶皱冲断系统(multi-detachment fold and thrust systems)。通过把一个沉积岩层分解成“膝折带”(kink-band)和“膝折楔”(kink-wedge)两部分,解决了模拟曲线形态的多转折断层转折褶皱的难点问题,而以往的几何学方法仅对真实的褶皱形态作了粗略的线性近似。通过把复杂的褶皱冲断系统分解成一系列迭加的滑脱层系,可以模拟复杂的楔体构造,并提供这些构造演化的二维动画。该软件被应用于美国加里福尼亚州的Wheeler山脊,一个活动的楔体构造,其构造解释得自于大量钻井数据,正演数值模拟再现了该构造的主要特征。
A generalized method of geometric numerical simulation of “fault fold” is proposed, and the corresponding numerical simulation software is compiled with C ++ language. The software enables the simulation of very complex fold-thrust systems, including multi-bend sbear fault-bend folds, composite wedge formations, and multi-slip delamination fold-off System (multi-detachment fold and thrust systems). By decomposing a sedimentary rock into two parts, the “kink-band” and the “kink-wedge,” the problem of multi-turning fault folding and folding in the form of a simulated curve is solved, whereas the previous geometric method Only a rough linear approximation of the true fold pattern is made. By decomposing a complex fold-thrust system into a series of superimposed skiddings, complex wedge configurations can be modeled and two-dimensional animations of these tectonic evolutions can be provided. The software is applied to the Wheeler Ridge, California, USA, an active wedge structure whose interpretation is derived from a large amount of drilling data and forward modeling reproduces the key features of the structure.