摘要
根据羊东井田2号煤层钻孔煤样瓦斯成份、含量及分布特征,以F1断层为界,以北为瓦斯稳定地段,以南至F6、F19断层为瓦斯异常地段。区内大量数据表明,在稳定地段内随煤层埋深增加,CH4含量较大,CO2含量减少;异常地段内由西向东CH4含量降低,CO2含量增高。CH4、CO2含量主要影响因素之一是断层,具有明显挤压特征的断层附近CH4含量高,张性断裂附近CH4含量低,CO2含量高;之二是岩浆活动,岩浆岩与碳酸盐接触分解出大量CO2,遇到断层后CO2沿裂隙由深部向浅部运移,造成断裂附近煤层中CO2含量增加。根据CH4浓度,井田东南边界的F19断层区段为CO2-N2带,向西北部渐变为CH4带。
According to Yangdong minefield No.2 coal seam borehole coal sample gas composition, content and distribution features, take the F1 fault as the boundary, the north part is gas stable sector, the south part from F1 to F6 and F19 faults is gas abnormal sector. Large quantity of data in the area demonstrated that, in the stable sector, along with coal seam burying depth deepening, CH4 content increasing, CO2 decreasing; in the abnormal sector, from west to east CH4 content decreasing, CO2 increasing. One of main influencing factor of CH4 and CO2 content is fault, near the fault with obvious compression features, CH4 content is high, near the tension fault, CH4 low, CO2 high; another factor is magmatic activity, when magma contacting carbonate rocks, large amount CO2 decomposed and migrated along the shattered fault zone from depths to shallows and CO2 content in coal seams near the fault increasing. Based on CH4 concentration, F19 fault section near the minefield southeastern border is CO2-N2 zone, toward northwest gradually changing into CH4 zone.
出处
《中国煤炭地质》
2008年第5期29-31,46,共4页
Coal Geology of China
关键词
瓦斯块段划分
影响因素
羊东井田
gas sector division
influencing factor
Yangdong mlnefield
