织金区块煤层气单井产能地质因素分析

Analysis on geological factors of single CBM well productivity in Zhijin block

通过对织金区块生产井地质参数的对比分析,认为影响织金区块煤层气单井产能的地质因素包括煤体结构、灰分、含气量、煤层厚度及煤层埋深等,其中煤体结构和含气量是影响单井产能的主控因素。总结出碎裂煤、低灰—低中灰、高含气量、较厚煤层、埋深适中等有利煤层地质特征与高电阻、高声波等有利煤层测井响应相结合的选层技术,为提高该区块煤层气单井产能规模,深化认识储层特征,结合地质实际,选择合理的层位生产提供技术支持。

By comparison and analysis of the geological parameters of production wells in Zhijin block, the geological factors con-sidered to affect the single CBM well production include coal structure, ash content, gas content, coal thickness and buried depth, among which the main controlling factors are coal structure and gas content. The layer select technology combined of the favorable coal seam geological characteristics such as cataclastic coal, low ash to low-medium ash, high gas content, moderate thickness coal seam and moderate buried depth, and the favorable coal seam logging response such as high resistance and high acousticwave was concluded. Therefore, in order to improve the single CBM well productivity scale of this area, it is necessary to deepen the under-standing of reservoir characteristics and combine with actual geology to choose reasonable production formation.