波动地质学在黄骅坳陷演化分析中的应用─—再论地壳波状运动

THE APPLICATION OF WAVE GEOLOGY IN BASIN ANALYSIS IN HUANGHUA DEPRESSION

波动过程──地应力、质点运动及质点状态在时空上有规律地扩散。在扩散过程中如果振幅及周期是不变的，这种过程为线性波动过程，反之为非线性过程。很多地质现象，实际上是诸多非线性波动过程互相叠加干涉的结果，波动过程的研究目的就是致力于发现这些规律性。应用滑动窗口可以逐步地分解出这些有规律的周期波并可以计算它们的周期、波长、传播时间及振幅￣［１］。应用该方法分析了黄骅坳陷新生代以来的发展演化史。研究结果表明，控制该坳陷演化的主要非线性波有四个：Ｆ、ｇ、ｎ、ｌ，其周期分别为Ｔ＿Ｆ＝２００～２２０，Ｔ＿ｇ＝６０～７０，Ｔ＿ｎ＝２７～３５，Ｔ＿ｌ＝６～１０（Ｍａ）。该波束的振幅主要取决于更大周期波的变化情况，两者为指数或对数分布，且是典型的裂谷系特点。在剖面上这些波的相态从南到北转移，平面上其频率也是从南到北逐渐变快（Ｔ＿南＝３０～３５；Ｔ＿北＝２２．８～２５），这对于预测盖层、储层在平面上的变化有重要意义。

The basic concept and method of wave geology and its application in the basin anlysis inHuanghua depression have been briefly explained in this paper.The wqve processes-describes the regular diffusion of stress,point movement and itscondition is time and space.The process is called linear wave if the amplitudes and cycles areconstant in the diffusion process on the contrary,a non-linear wave process occurs.The geo-logical features of the cyclicity and rhythm of metailogenesis and sedimentation are in fact theresults of superposition and interference of a series of non-linear wave processes.Therefore,the objective of wave process study is to find out these regularities.These regular cycle wavescan be decomposed by the sliding window step by step and then cycles,wavelengths,traveltimes,and amplitueds can be calculated.The evolution history since Cenozoic has been analysized in this way.The result of study shows that the evolution of the depression are controlled by four rnain non-linear waves,theyare F,g,n,l,with cycles:T_f=200～220,T_g=60～70,T_n=27～35,T_l=6～10 Ma。seperate-ly.The amplitude of this wave beam are mainly dependent on the changing of waves withgreater cycles,having a exponential or logarithmio,distribution this is a typical characteris-tics of a rift system.The phase of these waves migrate from south to north in section,and inplane their frequencies become gradually faster from south to north (T_s=30～35,T_n=22.8Ma),which is of important significance for predicting planar vflriations of sealing andreservoir formations.