山东五图煤田古近纪李家崖组油页岩品质特征分析

为了查明昌乐县五图煤田古近纪李家崖组油页岩的分布及其品质特征,从沉积学、油气地质学等方面开展研究。五图煤田古近纪李家崖组可划分为4部分:上部含煤段(A),中部含煤段(B)、油页岩段(C)和下部含煤段(D)。该组油页岩主要发育在淡水湖相沼泽环境,油页岩发育层数较多,可达80余层,但单层厚度不大。基于对大量钻孔的油页岩厚度统计及相关的化验测试,研究发现:李家崖组油页岩总厚度在研究区中部靠近南侧F3断裂处厚度最大,向四周减薄;灰分平均含量60%左右,靠近北侧F1断裂处灰分较高;焦油产率平均约8.36%,靠近南部F3断裂附近产率较高;硫分平均含量2.14%,水分平均含量4.2%,硫分和水分含量整体表现为东南部高西北部低。综合研究可以发现,研究区中南部靠近F3的地区,油页岩厚度大、品质好,是五图煤田油页岩资源潜力区。

Analysis on Quality Characteristics Oil Shale in Lijiaya Formation of Wutu Coalfield in Shandong Province

In order to find out the distribution and the quality characteristics of oil shale in Wutu coalfield in Lijiaya formation, from the aspects of sedimentology, oil and gas geology, Liliaya formation in Wutu coalfield can be divided into four sections: the upper coal bearing section (A), the middle coal bearing section (B), oil shale bearing section (C), and the bottom coalbearing section (D). The oil shale mainly occurs in fresh water lake wetland environment. The number of oil shale layer is more in this section and can reach more than 80 layers, but the thickness of single layer is small. Based on the thickness of a large number of drilling shale statistics and laboratory test, it is found that the thickest layer of oil shale is near the fault F3 in south side in the study area, and the thicknes of oil shale becomes small around the thickness centre. The average ash content of oil shale is about 60%. The ash content is higher near fault F1 which is in the north of the study area. The tar yield of the oil shale is about 8.36% on average and the oil shale whose yield ratio is higher located near the fault F3 in the south of the area. The content of sulfur is about 2.14% on average and the average content of moisture is about 2.14%. The sulfur and moisture content are higher in the southeast and lower in the northwest. By comprehensive study, it is conducted that the thickness of oil shale which is near the fault F3 in the southcentral of the study area is big and its quality is high. In conclusion, this area is potential area of oil shale.