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大宁-吉县地区位于鄂尔多斯盆地东部晋西挠褶带南段,区内主要发育一系列宽缓褶皱,东部、东南部发育少量断层。野外厚层砂岩节理测量点的观测结果表明,区内盖层砂岩节理发育方向为NE30°、NE60°和NW60°,在北部的午城、窑曲、管头一带节理密度较大。运用分形理论对煤层及盖层砂岩显微裂隙进行分析,区内8煤层显微裂隙比5煤层发育,午城、山中、薛关、水堤所围成的区域以及窑曲-桑娥区块分维值多在0.8以上,为显微裂隙发育区。综合分析认为薛关、午城和桑娥区块是煤层气勘查目标区。
The Daning-Jixian area is located in the southern section of the western Shanxi fold bend belt in the eastern Ordos Basin. There are a series of broad-width folds in the area and a few faults in the east and southeast. The observation results of thick sandstone joints in the field show that the joints of the caprock sandstone in the area are NE30 °, NE60 ° and NW60 °. The density of joints in the urban areas of Wucheng, Kiln and pipe heads in the north is large. Fractal theory is used to analyze the micro-fractures of coal and capping sandstones. The micro-fractures of No.8 coal seam in the area are more developed than that of No.5 coal seam, the area surrounded by Wucheng, Shanzhong, Xueguan and Shuidi and the area of kiln song- Fractal value of more than 0.8, for the development of micro-cracks. The comprehensive analysis shows that Xueguan, Wucheng and Sang’e blocks are the target areas for CBM exploration.