基于粗糙集理论的模糊综合评判权值确定

模糊综合评判在圈闭、区带等含油气性有利区预测及其优劣程度进行定量分析评价中发挥着非常重要的作用。在模糊综合评判中,参评地质因素的权值确定也非常重要。应用粗糙集理论,对原始地质数据进行挖掘,利用其求得各项参评地质因素的属性重要度,并将其权值化处理作为其权重系数,克服了传统方法确定权重系数的主观性,这样使得评价结果更具客观性,从而提高模糊综合评判精度。最后,以塔里木盆地塔西南凹陷圈闭评价为例,用此方法求得评价所需的各参评地质因素的权重系数。

DETERMINATION OF FUZZY COMPREHENSIVE ESTIMATION WEIGHTING COEFFICIENT BASED ON ROUGH SET THEORY

Fuzzy comprehensive estimation plays an important role in predicting favorite oil and gas-bearing regions and analyzing quantitatively their quality order in trap. In this method, it is very important to determine the geological factor weighting coefficient. Author of the paper applies Rough Set theory to de-termine significance of each geological factors and then shift significance of attribution to weighting coefficient, which overcomes the shortcomings of subjectivity in determining weighting coefficient with the traditional method and improve the accuracy of evaluation. Lastly, an example of evaluating traps in south western Tarim Depression in Tarim Basin using this method toinduce weighting coefficient of geological factors is given.