阳泉矿区煤层气气源层分析与PNN测井技术

Analysis of coal methane well gas source strata and PNN logging technology in Yangquan mining area

阳泉矿区多数矿井煤层回采的过程中出现矿井瓦斯涌出量大,远高于15号煤层瓦斯含量。PNN测井是一种利用测量地层中剩余热中子数量随时间变化关系,从中提取地层宏观俘获截面,利用两个中子探测器上得到的中子计数的比值有效的识别气层的方法。利用PNN测井技术对阳泉矿区已施工的煤层气井进行PNN测井,并进行含气层识别,对识别的气层进行射孔并压裂,根据后期排采发现,该技术对识别气源层有重要的意义。

In the process of coal seam recovery in most mine of Yangquan mining area, large mine gas emission overtops gas in No.15 current seam. PNN logging is an effective method of gas zone recognition which extracts stratum macroscopic capture cross section through using measured formation of residual thermal relationship changing over time and ratio of neutron counting getting from two neutron detectors. PNN logging technology is applied to log coal bed methane well in Yangquan mining area and identify gas-bearing bed processed by perforation and fracturing. Result of drainage in later period shows that PNN logging technology makes a difference in gas-source strata identification.