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基于灰色关联分析的盘关向斜煤层气有利井区优选

Optimization of favorable well for CBM based on Grey Correlation Analysis in Panguan Syncline

  • 摘要: 为了进一步落实盘关向斜煤层气井开发时序问题,基于前期地质资料和近几年实施的8口煤层气参数井资料,系统总结了盘关向斜煤层特征、含气性及物性特征,通过灰色关联分析法,对盘关向斜8口煤层气参数井从含气量、煤厚、资源丰度、构造复杂程度、埋深、渗透率、临储比7个方面进行了最优关联,并根据其关联度进行排序优选。研究结果表明:盘关向斜整体上煤层累厚大、含气量高、煤种齐全、煤储层微小孔发育,具有良好的煤层气物源基础,但其单层煤层较薄、渗透率较低,具有较大的非均质性,在开发时序上建议将灰色关联分析法优选出的PG1、PG3、PG2、PG4四个井区作为先导试验井区进行优先开发,其余4个井区作为后备开发井区。

     

    Abstract: In order to further implement the development timing issue of CBM well area in Panguan Syncline and based on the previous geological data and 8 parameter wells drilled in recent years, the coal seam characteristics, hydrocarbon content and physical properties of the coal seams in Panguan Syncline were summarized. Through the Grey Correlation Analysis Method, the optimal parameters associated with the gas content, coal thickness, resource abundance, structural complexity, buried depth, permeability, and temporary storage ratio of the 8 CBM parameter wells were analyzed and then sorted according to their correlation. The results show that Panguan Syncline has large accumulated thickness of coal seams with high gas content and well-developed micro-pores, but it has high reservoir heterogeneity and low permeability for thin thickness of single coal seam. It is recommended to use PG1, PG3, PG2, PG4 as pilot test well areas for priority in development by using Grey Correlation Analysis Method. The remaining four wells are used as backup development well areas.

     

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