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镜质体是一种由高等植物木质素经过生物化学降解作用和凝胶化作用形成的胶状体,在煤和炭质泥页岩中含量高,仅出现在志留纪及其以后的地层中。此外,还有一种海相镜质体,主要由海洋低等生物(藻类、菌类及某些海洋低等动物)经腐殖化作用而形成,主要存在于早古生代及晚古生代页岩和碳酸盐岩地层中。研究表明,海相镜质体反射率(R~o_m)可作为成熟度指标加以应用。海相镜质体成熟作用轨迹不同于镜质体,二者存在一定的相关关系,使用时需把海相镜质体反射率换算为镜质体反射率(R_o)。镜质体反射率是一个寻找隐伏岩体的好方法,作者采用镜质体反射率方法对铜陵地区开展了研究,初步结果表明,铜陵地区全部数值均超过地热增温率理论曲线,说明铜陵地区深部可能有较大的隐伏岩体,深度大约在4~5 km左右。此外,在ZK113号钻孔深度200~260 m处R_o很高(>2%~3%),可能预示钻孔旁侧有规模较小的隐伏侵入体,推测距钻孔距离不超过100 m,但具体方位不详。上述研究表明采用镜质体反射率方法寻找隐伏岩体是可行的,它的最大优点是解释的唯一性,R_o数值仅与温度有关,不受其他因素的干扰。
Vitrinite is a colloid formed by the biochemical degradation and gelation of higher plant lignin. It is high in coal and carbonaceous shale and appears only in the Silurian and later strata in. In addition, there is also a marine vitrinite, which is mainly formed by the humification of low marine organisms (algae, fungi and some marine lower animals), mainly in the Paleozoic and Late Paleozoic shale and carbon Inrush strata. The results show that the vitrinite reflectance (R ~ o_m) can be used as a maturity index. The path of maturation of marine vitrinites is different from that of vitrinites. There is a certain correlation between the two. The reflectance of marine vitrinites should be converted into vitrinite reflectance (R_o). Vitrinite reflectance is a good way to find hidden rock mass. The authors studied the Tongling area by using the vitrinite reflectance method. The preliminary results show that all the values in Tongling area exceed the theoretical curve of geothermal warming rate, indicating that Tongling area Deep may have a larger hidden rock, the depth of about 4 ~ 5 km or so. In addition, the high R_o (> 2% ~ 3%) at the depth of 200-260 m of ZK113 may indicate that there is a smaller hidden intrusive side of the borehole and the distance from the borehole is not more than 100 m , But the specific orientation is unknown. The above research shows that the use of vitrinite reflectance method to find hidden rock mass is feasible, its biggest advantage is the uniqueness of interpretation, R_o values only with temperature, free from interference with other factors.