冀东南堡凹陷断裂系统分形研究

STUDY ON FRACTAL OF FAULTS SYSTEM IN THE NANPU SAG, JIDONG

根据冀东南堡凹陷明化镇组底界断裂分布图,利用分形理论容量维数法检验了断裂空间分布,发现其具有很好的自相似性,相关系数在0.98～1之间,断裂系统具有分形结构。计算并绘制了南堡凹陷明化镇组底界断裂分维值等值线图,发现容量维大于1.18的区域与已发现的4个油田中的3个重合,表明分维值分布与油田分布之间存在着一定的联系,并由此推断北堡西构造带、南堡构造带和蛤坨构造带应是开展进一步研究的有利区带。

According to figure of faults distribution in the bottom of Minghuazhen formation of nanpu sag, self-similarity of fault spatial distribution has been examined by using fractal theory and the fractal dimension of capacity. Correlation coefficients are between 0.99 and 1, which suggests that faults are fractal structure. The fractal dimension of capacity(D_(0)) in different areas have been calculated and its isoline map is drawn. Author find that the three of four oilfield are located in the areas where the fractal dimension of capacity are larger than 1.18, which show that the distribution of the fractal dimension relates to the distribution of oilfield. So Beipuxi fault zone, nanpu fault zone and getuo fault zone are ascertained as the favorable areas.