一种单砂体多因素分类评价方法——以柴达木盆地扎11井区下油砂山组为例

A Method on Multi-factor Evaluation and Classification of Single Sand Body: A Case from Lower Youshashan Formation in Zha 11 Wellblock, Qaidam Basin

传统的砂体分类评价方法受人为主观因素影响较大,评价方法较为复杂,无法满足油田精细开发的需求,探索新的砂体分类评价方法很有必要。以扎11井区下油砂山组湖相砂坝为例,基于SPSS软件,根据皮尔逊相关系数优选出单砂体地质储量、含油面积、地层系数、形状因子等代表性参数,采用多元线性回归确定各参数的权重,然后进行多因素分类评价,建立了单砂体分类模型及标准,实现了对扎11井区下油砂山组单砂体分类评价。该方法为油田开发与调整提供科学依据,并在油田生产中得到较好应用。

Traditional evaluation methods on sand bodies are insufficient to meeting the fine developing requirement in oil production because they are often affected by subjective factors, or very complicated to operate. Therefore, it is necessary to explore new method on evaluating and classifying sand body. A new evaluation and classification method was introduced based on SPSS software and lacustrine sand bars in Lower Youshashan Formation in Zha 11 wellblock, Zhahaquan Oilfield, Qaidam Basin. Firstly, representative evaluation parameters, such as geological reserves, oil-bearing area, formation coefficient and shape factor were filtered out by Pearson correlation coefficient in SPSS. Secondly, the weight coefficients of all parameters were confirmed by multiple linear regression analysis in SPSS. Thirdly, multi-factor evaluation of single sand body was carried out, and classification model and standard were set up. The single sand bodies in Lower Youshashan Formation in Zha 11 wellblock were evaluated and classified by this method, which provided technical support for development plan adjustment and was applied well in oil production.