下侏罗统含煤系是铀矿化赋存的有利部位。
Uranium mineralizations are hosted in the Middle-Lower Jurassic coal-bearing series.
西北地区中、下侏罗统煤层广布，厚度较大；
The Middle and Lower Jurassic with thick coal seam is widely distributed in Northwest China.
钻井揭示，中—下侏罗统为中生界主要烃源岩。
According to the drilling results, the middle-lower Jurassic can be considered the main Mesozoic source rock.
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