But the level of maturity of organic matter in the source rocks is obviously lower, because the lower tertiary source beds are of shallower burial and smaller geothermal gradient.
但由于生油层埋藏较浅，地温梯度偏低，致使各生油层有机质的成熟度明显比好生油凹陷低，主要生油层目前仍处于低成熟—成熟演化阶段。
By using a new method and pyrolysis date of rock, study on expulsion efficiency of hydrocarbon for lower tertiary source rock has been carried out in north area of lower Dongpu Depression.
利用岩石热解资料，采用一种新的方法，对东濮凹陷北部地区下第三系源岩的排烃效率进行了研究。
The reservoirs found in the Lower Tertiary are mainly structural and stratigraphic type.
下第三系发现的油气藏以构造油气藏和地层油气藏为主。
In the regional stratigraphic classification and correlation, the Lower Tertiary strata are absent in Guyang basin, Inner Mongolia.
在区域地层划分与对比中，内蒙古固阳盆地缺少下第三系。
Huimin basin is one of the Cenozoic rift basins around Bohai Gulf. Lower Tertiary sediments are well developed in its western part.
惠民凹陷是渤海湾地区新生代断陷盆地之一，其西部地区下第三系发育完整。
The natural gas of the main type in North China Basin is generated in the symbiotic window of oil and gas in Lower Tertiary source rocks.
华北盆地天然气的主要类型是下第三系源岩在油气共生窗中生成的。
A model for the Lower Tertiary framework and sequence system tract of Jiyang subbasin was established with the high-resolution sequence stratigraphy.
建立了济阳坳陷下第三系高精度层序地层格架和层序体系域的构成模式。
This paper describes that the lacustrine carbonate of lower Tertiary Sha- hejie Formation in Bohai Bay is mostly terrigenous elastics-carbonate mixture rock.
本文提出渤海地区下第三系沙河街组湖泊成因的碳酸盐岩大都是陆源硅质碎屑和碳酸盐的混合岩。
This paper describes that the lacustrine carbonate of lower Tertiary Sha- hejie Formation in Bohai Bay is mostly terrigenous elastics-carbonate mixture rock.
本文提出渤海地区下第三系沙河街组湖泊成因的碳酸盐岩大都是陆源硅质碎屑和碳酸盐的混合岩。
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