摘要
为了查明煤层含气量主控地质因素,利用数理统计和地质分析等方法,分析研究了五轮山井田构造、煤层埋深、顶板岩性、水文地质条件等因素与含气量的相关性。研究结果表明:该井田8号煤层含气量总体较高,具有"中部高,水公河向斜轴部高,加戛背斜轴部低"的分布特点,其地质构造、水文地质条件是含气量的主控地质因素:水公河向斜轴部及地下水汇集的区域,赋存条件好,煤层含气量高;靠近切割煤层的小断层附近,封闭性较差,煤层气容易逸散,含气量降低;煤层含气量与煤层埋深、顶板岩性和厚度相关性较差,但靠近水公河向斜轴部,含气量随着深度的增大而增加,具有向斜控气的特征;研究区顶板厚度普遍大于5 m,封闭性较好,发育泥岩伪顶的区域封盖性能更好,煤层含气量更高。
In order to find out the main control geological factors of the seam gas content,the mathematical statistics and geological analysis and other method were applied to analyze the relativity of the structure,seam depth,roof lithology,hydrogeologic condition and other factors with the gas content. The study results showed that the gas content of No. 8 seam was high generally and would have a distribution feature with " a high gas content in the middle part,a high gas content at the syncline axis of Shuigong River and a low gas content at the Jiaga anticline axis. The geological structure and hydrogeologic conditions would be main geological factors of the gas content. The syncline axis part of Shuigong River and the groundwater collected area would have good occurrence conditions and the seam gas content would be high. The small fault near the cutting seam would have a poor sealing,easy released coalbed methane and low gas content. The seam gas content had a poor relativity with the seam depth,roof lithology and thickness. But near Shuigong River syncline axis part,the gas content would be increased with the depth increased and would have the syncline gas control features. In the study area,the roof thickness generally would be higher than 5 m,the roof sealing would be good,the sealing and covered performances of the developed mudstone false roof would be more better and the seam gas content would be higher.
作者
周培明
付炜
董磊
ZHOU Peiming;FU Wei;DONG Lei(Guizhou Engineering Technology Research Center of Coalbed Methane and Shale Gas,Guiyang 550008,China;Guizhou Unconventional Gas Resource and Development Center,Guiyang 550081,China)
出处
《煤炭科学技术》
CAS
北大核心
2018年第12期192-196,共5页
Coal Science and Technology
基金
国家科技重大专项资助项目(2016ZX05044001-005)
关键词
五轮山井田
煤层含气量
控气因素
水文地质
构造
Wulunshan Minefield
gas content of seam
gas control factor
hydrogeology
structure
