扇形沉积体生长的分形几何特征分析  

Fractal Features of Fan Shaped Depositional Bodies

作　　者：周江羽[1] 刘常青[2] 

机构地区：[1]中国科学院广州地球化学研究所,广州510640 [2]中国地质大学,武汉430074

出　　处：《沉积学报》2000年第1期95-99,共5页Acta Sedimentologica Sinica

基　　金：中国海洋石油总公司研究中心 9618课题资助

摘　　要：扇形沉积体是我国内陆及沿海地区中、新生代含油气盆地中的重要油气勘探目标 ,对其平面分布形态和内部结构参数特征的定量表征是油气勘探部门极为关注的问题。随着分形几何理论在沉积学领域应用的日趋广泛 ,使人们可从新的角度来考虑这一问题的解决方法。扇形沉积体的生长是一个复杂的非线性动力学过程 ,且具有分形特征。分维数的大小反映了沉积体外部形态和内部结构的复杂程度 ,分维数的变化幅度预示着构造和沉积背景的某些信息。将分形和混沌理论相结合 。Fan-shaped depositional bodies are those mainly composed of terrigenous coarse deposits and fan-shaped in morphology, including alluvial fan, fan delta, delta and subaqueous fan and so on. They are important exoil-gas targets in oil and gas-bearing basins in Mesozoic and Cenozoic interior and offshore in China, which are the problems deeply concerned with by oil-gas exploration department to show quantitatively the features of their morphological distribution and inner structure parameters. Recent researches on fan-shaped bodies are results combining static, qualitative and megascopic methods with dynamic, quantitative and microscopic approaches. Great efforts were made in quantitative modeling and in simulating of structural parameters of sedimentary bodies, but there have been still few of published documents about how to build morphological and simulating models of sedimentary bodies up to now. With fractal theory applied widely to sedimentology , it may be considered from a new point of view to solve the problems. The growing of fan-shaped depositional bodies is a complex nonlinear dynamics process and a fractal. Fractal dimension may reflect the complexity of their outer morphology and inner structure, and predict some information about tectonic and depositional setting. It will be one of the most important ways to realize nonlinear dynamics building models and simulation of depositional bodies combined fractal with chaos theory. On the bases of analyses of sedimentological features of more than twenty faulted basins at home and abroad, the paper probes the growing dynamic process of fan-shaped depositional bodies, summarizes their fractal features, and establishes the model of shape fractal growing and structural fractal. The structural fractal box dimensions are determined. Simulations of morphologies of the fan-shaped bodies are made by fractal, and of their structures by fractal-Kringing. The main conclusions are as follows: 1.Fan-shaped sedimentary bodies are complex nonlinear system

关 键 词：扇形沉积体 分形 分维数 分形几何 油气勘探 

分 类 号：P618.130.8[天文地球—矿床学] P512.2[天文地球—地质学]