盖层封闭能力的灰聚类评价方法

Grey clustering evaluation method of the sealing ability of cap rock.

提出灰聚类评价方法，用于盖层封闭能力定量评价。所有被评价对象构成聚类对象集，所有评价指标构成评价指标集，所划分的盖层封闭能力等级构成聚类的灰类集，按照最大聚类权确定对象所属的灰类，即盖层的封闭能力级别。评价流程是：确定指标灰类模式→数据预处理→利用聚类公式计算→利用最大聚类权准则抉择。这种方法避免了加法评分法要依靠人的主观经验划定总评分值的问题，而且由于把评价对象视为“灰”的，具有处理边缘信息的能力。以琼东南盆地３个主要探区的盖层封闭性评价为例，介绍了灰聚类评价的具体应用方法。灰聚类评价方法同样可用于储集层评价、圈闭评价等地质问题的定量研究。

In the paper the grey clustering evaluation method is put forward to evaluate quantitatively the sealing ability of cap rock for oil and gas. All the evaluated objects compose a collection of clustering objects. All the evaluation indices form a collection of clustering indices. And a collection of the grey categories of clustering consists of all the partitioned levels of the sealing ability of cap rock evaluation indices. The level of the sealing ability of cap rock can be determined according to the maximum clustering weight (MCW). The evaluation process is as follows: determining the model of index categories, preprocessing the data, calculating clustering weights and making choices by MCW. This method avoids the problem of distinguishing the level of the total mark by subjective experience in the addition mark method. And also it has the ability to deal with the marginal information as the evaluated objects are regarded as grey things. This method is applied to evaluate the cap rocks of the three main prospecting areas in the Qiongdongnan basin. It can also be used for quantitative evaluation of the reservoir and trap, etc..