摘要
本文运用分形理论对张强凹陷科尔康油田沙海组下段顶（Ｔ１）、九佛堂组顶（Ｔ２）和义县组顶（Ｔ３）３个反射层断裂系统的分布特征进行了研究，发现在标尺范围（８—０．５ｃｍ）内断裂系统具有良好的统计自相似性，不同的研究对象具有不同的分维值（Ｄ），而分维值的大小体现了断裂系展布的复杂性。断裂的规模、数目及在相同标尺下的面密度直接影响数盒子数法计算的分维值，不同子区域断裂系统的分维值Ｄ与其断裂所占断裂总数的百分比呈良好的正相关关系。不同储集类型的子区域对比表明，东区沙海组下段顶（Ｔ１）分维值高于西区，而西区义县组顶（Ｔ３）分维值高于东区。与油田已知油气分布特征对比后，发现并证实油田内子区域分维值大，油田丰度（含油面积或流体产能）就大。含油气盆地这种内在对应关系，为研究油气聚集和分布规律。
Geometric characteristics of the fault system as indicated by the three seismic reflection layers T 1,T 2,T 3 are studied by using fractal theory in Kerkang oil filed of Zhangqiang depression.As a result,the authors find that these fault systems are statistically self similar within the scale range studied (r=0.5cm to 8cm).But different fault systems have different fractal dimension values D that reflect the complexity of their geometry.The size,number and spacing of faults within the same scale range may affect the magnitude of D obtained by box counting method.There is a good correlation between D and the percentage of the individual fault system in different subregions divided.A comparision of the results of different subregions of different reservoir types shows that D value in the east subregion is higher than that in the west subregion for T 1,and that the D value in west subregion is slightly higher than that in the east subregion for T 3.It is shown that the higher the D value,the larger the oil gas abundance (oil bearing area or output of oil,gas and water)in the subregions.Such a relation between D values of fault systems and oil gas distribution will provide a clue for researching the accumulation of oil and gas and their prediction in petroliferous basins.
出处
《地质力学学报》
CSCD
1997年第1期81-87,共7页
Journal of Geomechanics
关键词
油田
油气藏
断裂
分形特征
地质构造
fraction,fault systems,oil and gas,Kerkang oil field
