According to geological age, it may be divided into Upper Triassic coal-bearing formation and Lower-Middle Jurassic clastic rock formation.
根据它的地质时代，划分为上三叠统含煤建造和中下侏罗统碎屑岩建造。
Therefore, the Lower-Middle Jurassic is selected as the main target horizon for sandstone-hosted uranium deposit, and the Lower Cretaceous as the minor one.
因此，将中下侏罗统确定为本区的主要找矿目标层，下白垩统为次要找矿目标层。
In terms of molecular geochemistry indexes, the hydrocarbon source rocks both in lower Jurassic and middle Jurassic can be classified as lake facies and swamp facies.
根据分子地球化学指标，下侏罗统和中侏罗统烃源岩都可划分为湖相和沼泽相两类。
The early Middle Jurassic was an major coal-forming period in the region, when the Lower Yaopo Formation of lacustrine-deltaic and swamp facies was deposited.
中侏罗世早期是全区重要的成煤期，下窑坡组为湖泊—三角洲及沼泽相。
Permo Carboniferous coal series have relative good coal gas potential, dark mudstones in lower Jurassic, lower part of Middle Jurassic and lower Cretaceous are the best source rocks.
区内石炭—二叠纪煤系具有良好的煤型气及一定的煤层气潜力，中、下侏罗统和下白垩统暗色泥岩类是最具生油潜力的烃源岩系。
A number of suites of Carboniferous, middle-lower Jurassic and lower Cretaceous hydrocarbon source rocks were developed in the basin groups in the Paleo-Asian and Tethyan structural confluence area.
古亚洲与特提斯构造交汇带盆地群发育石炭系、侏罗系（中下统）、白垩系（下统）等多套烃源岩，具有厚度大、分布广、有机质丰度高的特点。
The top boundary of Jurassic is delimitated between the lower and middle part of Datonghe Formation.
侏罗系上界暂定在大通河组下部与中部之间。
Uranium mineralizations are hosted in the Middle-Lower Jurassic coal-bearing series.
下侏罗统含煤系是铀矿化赋存的有利部位。
The strata of Mesozoic and Cenozoic in the basin can be divided into three parts, Middle Jurassic (Longjiagou Formation ), Lower Cretaceous and Upper Miocene (Baode Formation ).
根据化石组合，龙家沟盆地的地层可划分为中侏罗统龙家沟组，上白垩统及上中新统保德组。
Its wall rocks consist of the regional metamorphic rock, series of Mayuan formation and middle-lower Carboniferous series as well as lower Jurassic Lishan formation.
其围岩有麻源组和中下石炭统的区域变质岩系及下侏罗统梨山组地层等。
The Middle-Lower Jurassic to the west of Ejin Qi-Alxa Youqi, and the Lower Cretaceous in the northwest part of the corridor, Zongnan and Zongbei De-pressions have better oil potential.
额济纳旗-阿拉善右旗一线以西的中下侏罗统、走廊坳陷北段及宗南、宗北诸坳陷的下白垩统含油气远景较好。
In some of the faulted basins of the Mesozoic to Cenozoic ages in Heilongjiang Province, the Middle Upper Jurassic, Lower Cretaceous and Teritary auriferous conglomerate are most widespread.
黑龙江省一些中—新生代断陷盆地内，中、上侏罗统、下白垩统及第三系砾岩含古砂金较为普遍。
The Middle and Lower Jurassic with thick coal seam is widely distributed in Northwest China.
西北地区中、下侏罗统煤层广布，厚度较大；
According to the drilling results, the middle-lower Jurassic can be considered the main Mesozoic source rock.
钻井揭示，中—下侏罗统为中生界主要烃源岩。
Several in-situ leachable sandstone-type uranium deposits are hosted in the Shuixigou Group, Middle-Lower Jurassic in the southern margin area of Yili basin.
伊犁盆地南缘中、下侏罗统水西沟群产有数个可地浸的砂岩型铀矿床。
Several in-situ leachable sandstone-type uranium deposits are hosted in the Shuixigou Group, Middle-Lower Jurassic in the southern margin area of Yili basin.
伊犁盆地南缘中、下侏罗统水西沟群产有数个可地浸的砂岩型铀矿床。
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