基于层次分析法的煤储层构造复杂程度定量评价

Quantitative assessment of structure complexity of coal reservoir based on analytical hierarchy process

为研究贵州织纳煤田比德区块6号主采煤储层构造复杂程度,选取构造曲率、断层强度、断层密度、断层分形维数等4个参数,采用层次分析法构建了构造复杂程度评价指标体系;结合分形理论及区块内断层、褶皱发育和分布情况,对6号煤储层构造复杂程度进行了定量化研究和评价,划分了煤储层构造复杂程度分区。结果表明:研究区构造复杂程度类型主要为简单和中等,构造复杂区多集中在区块边缘断裂和大型褶皱发育地带;构造复杂程度主要受控于岩脚向斜及阿弓向斜等大型褶皱,断层在一定程度上加剧了煤储层的复杂性,说明区块内构造对6号煤储层的控制作用极为显著。研究结果可为该区煤层气勘探开发提供理论依据。

In order to study the structural complexity of main coal seam No.6 in Bide block,Zhina coalfield,Guizhou province,the four parameters of the structural curvature,fault strength,fault density and fault fractal dimension were chosen to construct an evaluation index system for the complexity by using analytic hierarchy process.Combining the fractals theory and the development with distribution of faults and folds in the block,the complexity of the structure of coal seam No.6 was quantitatively studied and evaluated,and the complexity of reservoir structure was zoned.The results showed that the types of the tectonic complexity in the study area were mainly simple and moderate,and the structural complex areas were mostly concentrated in the fringe of the block where developed faults and large folds;the complexity of the structure was mainly controlled by large folds such as Yanjiao syncline and Agong syncline.The faults exacerbated the complexity of the reservoir to a certain extent which indicated the structures within the block had a significant control over coal seam No.6.