Q型聚类分析和判别分析法在储层评价中的应用——以鄂尔多斯盆地姬塬地区长8_1储层为例

Application of Q-type Cluster Analysis and Discriminatory Analysis in Reservoir Evaluation—Taking Reservoir Chang 8_1 of Jiyuan Area in Ordos Basin as an Example

鄂尔多斯盆地姬塬地区长8油层组为该研究区已经探明的最为有利的油气聚集层位之一。油藏成藏机制复杂,储层非均质性强,有效储层的预测和评价难度较大。鉴于研究区这一地质特点,以鄂尔多斯盆地姬塬地区长81储层为例,选择资料丰富的20口井的小层参数数据,首先应用Q型聚类分析对该区域长81储层进行了分类,得到了评价分类指标;然后利用判别分析法对Q型聚类分析的分类指标进行了验证,综合给出了储层评价的定量化描述。结果表明,该方法与其他评价方法的结果具有一致性,在砂岩储层的评价中是可行的,有一定的应用价值。

Chang 8 reservoirs of Jiyuan area in Ordos Basin are one of the most favorable reservoirs in the approved reserves.It is difficult to predict and evaluate the effective reservoirs due to the complicated mechanism of reservoir formation and the strong reservoir heterogeneity.The paper firstly uses Q-type cluster analysis to classify reservoirs by selecting the parameters of the small layers from 20 wells based on the example of Chang 8 reservoirs of Jiyuan area in Ordos Basin,thus getting the criteria of evaluation and classification;and then the classification indicators of Q-type cluster analysis are verified by using discriminatory analysis,thus giving the quantitative description of reservoir evaluation.The results show that the method mentioned in this paper is consistent to the existing evaluation methods;the method is feasible in sand reservoir evaluation;and the method is valuable in application.