lower jurassic meaning in English
下侏罗纪
Examples
- Establishment of high - precision sequence framework of middle - lower jurassic in turpan sag
吐鲁番坳陷中下侏罗统高精度层序地层格架的建立 - 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。 - This is similar to the synchronous deposition of black shale in europe . during the lower toarcian , coincident with the peak of the lower jurassic transgression , highly bituminous shales were deposited in extensive parts of the european epicontine
这种有机碳异常富集的沉积层被描述为大洋缺氧事件（ oae ）的沉积，与白翌纪赛诺曼十仑期类似。 - The result shows that a sequence boundary is identified inside member 2 of sangonghe formation of lower jurassic , which is characterized by lithology of scour surface and conglomerate and gravel bearing gritstone over it , and by well logs of abrupt contact
通过岩心、录井、测井、地震的综合研究发现，在下侏罗统三工河组二段内部可以识别出一个三级层序界面。 - First of all , the substance foundation of low - rank coal cbm generation in the basin has been discussed according to the development of coal reservoir , coal petrography , coal properties , coal rank , coal genera , coal facies feature of lower jurassic badaowan formation ( jlb ) and middle jurassic xishanyao formation ( j2x )
首先，根据下侏罗统八道湾组( j _ 1b )和中侏罗统西山窑组( j _ 2x )煤储层发育、煤岩、煤质、煤级、煤类、煤相地质特征论述了本区低煤级煤层气生成的物质基础。