吾祠煤矿地质构造特征及其对煤系地层的影响

Geological Structural Features of Wuci Coal Mine and Its Impact on the Coal Measures Strata

吾祠煤矿构造复杂,断裂发育,严重制约了煤田的勘探与开发,通过野外地质工作和煤田勘探资料,对吾祠煤矿构造特征及对煤系地层的影响进行深入的探讨。结果表明吾祠煤矿构造复杂,断层与褶皱、断层与断层之间相互切割、相互作用,使煤系地层形态遭受破坏,平面上形成形态各异的断块,剖面上又组合为半地堑式及阶梯状抬斜断块等形式,破坏了煤层的连续性;缓倾角断裂使煤层重复出现,造成储量相对集中,含煤密度提高;同时由于断层的切割,造成煤系地层断失变薄,使主采煤层的埋深抬高;断裂活动和岩浆侵入,使煤的变质程度出现南西与北东分带的特点,由南西往北东变质程度逐渐变高,在断裂带及褶皱弯曲部位的变质程度较大。

Due to the complex structures and developmental ruptures of Wuci coal mine, the exploration and development were seriously hampered. Through the geological field works and exploration data, the geological structural features of Wuei coal mine and its impact on the coal measures strata were discussed deeply. The results showed that： the structures in Wuei coal mine were complex; the mutual cutting and affecting between faults and folds, folds and folds damaged coal measures strata form, which caused different forms of blocks formed in plane, half-graben and stepped lifting ramp blocks combined in cross-section; the continuity of coal seams was damaged; low-angle dip rupture caused repeated coal seams, relative concentrated reserves and increased the density of coal; at the same time, cutting folds caused coal measures strata became poor and raised the depth of main coal seams; moveable ruptures and intruding magma caused the south west and north east zonation of coal metamorphism; the metamorphism gradually increasing from south west to north east and the metamorphism was large in ruptures and folds parts.