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鄂尔多斯盆地的侏罗系含煤地层,分布于陇县—彬县—焦坪—店头—延安—榆林—神木以北和以西的广大地区。侏罗系含煤地层为延安组,该组含煤地层分为上、下两段。上段称枣园段:由一套湖泊、沼泽相为主的灰白色长石砂岩与黑色页岩、粉砂质泥岩互层组成,含石油或夹煤层,岩性及厚度变化均较大,厚度14—277米。下段称宝塔山段:由一套河流相灰黄色、灰白色块状中粗粒含长石砂岩组成,夹泥岩和砂泥岩透镜体,偶夹煤线。
The Jurassic coal-bearing strata in the Ordos Basin are located in vast areas north and west of Long County, Bin County, Jiao Ping, Diantou, Yan’an, Yulin and Shenmu. Jurassic coal-bearing strata are Yan’an Formation. The coal-bearing strata in this group are divided into upper and lower sections. The upper section of the Juyuan section is composed of a set of lacustrine and marsh-dominated greyish feldspathic sandstone with black shale and silty mudstone interbedded with petroleum or intercalated layers with large changes in lithology and thickness with a thickness of 14 -277 meters. The lower section of the Pagoda Hill section: from a set of river facies gray yellow, gray block coarse sandstone with feldspar composition, mudstone and mudstone sandstone lens folder, even the coal line.