摘要
松辽盆地北部大庆长垣以东地区是松辽盆地北部深部来源气分布的主要地区，也是深源气勘探程度最高的地区。为了分析控制深源气运移的主要地质因素，文章计算了该地区Ｔ２、Ｔ３、Ｔ４三个反射层不同区域内断层体系的盒维数和信息维数。计算结果表明，这些区域的断层体系具有明显的自相似分形特性，分形维数基本分布在１．２～１．８之间。通过分析不同区域内的断层体系分形维数大小和深源气田（藏）的关系，发现断层体系分维高值区与深源气气田（藏）的分布区存在着良好的对应关系，表明断层体系在该区深源气运移和聚集过程中起着重要的控制作用。由于分形维数值大小反映了断层体系空间分布的复杂程度，分形维数越大，断裂及其伴生的小断层和裂缝就越多，对油气二次运移就越有利。
The region lying to the east of Daqing placanticline in the north part of Songliao Basin is the major area of deep source gas distribution,being also the one with the highest degree of exploration for the deep source gas.In order to analyze the major geological factors of controlling deep source gas migration,the box dimension and information dimension of the fault system in three reflection horizons (T 2,T 3 and T 4)at various areas of this region are calculated in the paper.It is shown by the calculated results that the fault system at these areas are of obviously self similar fractal property,their fractal dimensions being mainly 1.2～1.8.Through analyzing the relation between the fractal dimension values of fault system and the deep source gas fields (reservoirs)at various areas,it is found that the high value area of the fractal dimension of fault system is well correlative to the deep source gas field(reservoir)distribution area,which indicates that the fault system plays an important part in the process of the deep source gas migration and accumulation in this region.Because the size of the fractal dimension value reflects the degree of complication of the spacial distribution of fault system,the larger the fractal dimension value,the more the ruptures,associated small faults and fractures,which is more beneficial to the secondary migration of oil and gas,therefore,the size of the fractal dimension value can be taken as a criterion reflecting whether the condition of the secondary migration of deep source gas is good or not.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
1998年第2期17-20,共4页
Natural Gas Industry
关键词
断层
分形学
深层气
二次运移
油气运移
ault,Fractal,Deep gas,Secondary migration,Daqing placanticline,East
