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冀北坳陷位于燕山褶皱带中段,面积约7000km~2,沉积了巨厚的中一上元古界海相碳酸盐岩夹碎屑岩地层,总厚度愈8000m。生油岩层系多,厚度大,有下马岭组、铁岭组和洪水庄组三套好烃源层,高于庄组和雾迷山组两套较好烃源层。有机质类型好,有机质主要为Ⅰ～Ⅱ_1型。有机质丰度高,下马岭组和洪水庄组页岩 TOC 高达2.39％～2.84％,铁岭组和高于庄组碳酸盐岩 TOC 可达0.31％和0.23％。古地温低,有机质热演化程度相对较低,雾迷山组及上覆地层多处于生油阶段。区内已发现油苗点76处,油苗以液态原油为主,均具有原生特点,蓟县系油苗中微量元素同位素年龄测定为1253±220Ma。冀北坳陷内党坝凹陷面积3100km~2,原始有机质丰度高,生烃强度大,已发现三个遭到破坏的古油藏。党坝凹陷有中生界和古生界作盖层,对油气保存十分有利,是寻找中—上元古界原生油气藏的最有利地区。
The Jibei Depression is located in the middle of the Yanshan fold belt, with an area of about 7000 km ~ 2. There is a huge thickness of Mesozoic-Proterozoic marine carbonate clastic clastic formations with a total thickness of 8000 m. There are three well hydrocarbon source rocks in the Lower Cretaceous, the Lower Cretaceous, the Tieling Formation and the Hongshuangzhuang Formation, which are higher than that of the Zhuang Formation and the Wumishan Formation. Type of organic matter is good, organic matter mainly Ⅰ ~ Ⅱ 1 type. The TOC of shale in Xiamaling Formation and Hongshuangzhuang Formation is as high as 2.39% -2.84%, and the TOC of Tieling Formation and Gaoyuzhuang Formation is 0.31% and 0.23% respectively. Paleo-geothermal temperature is low, and the extent of thermal evolution of organic matter is relatively low. Most of the Wumishan Formation and overlying strata are in the oil-producing stage. The region has found 76 oil seedlings, the oil-based crude oil liquid, all with the original characteristics of Jixian oil in the trace element isotope dating of 1253 ± 220Ma. The area of inner party dam depression in Jibei Depression is 3100km ~ 2, with high original organic matter abundance and high hydrocarbon generation intensity. Three ancient reservoirs have been discovered. There are Mesozoic and Paleozoic caprocks in the dam of the Dam, which are very favorable for the preservation of oil and gas. They are the most advantageous areas for finding primary oil reservoirs in the Middle-Upper Proterozoic.