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燕山地区西起张家口,东到阜新,横跨冀京津辽两省两市,呈一近东西向转北东的带状山区,本区自太古界以来剧烈沉降,广泛发育震旦亚界地层,厚逾万米,是目前我国最古老的沉积岩系。下古生界在燕山地区零星分布,但往东、往南却分布宽广,厚度达一千米以上。这套巨厚的古老碳酸盐岩层,以往没有引起我们石油地质勘探工作者的注意。1975年冀
The Yanshan area starts from Zhangjiakou in the west and reaches Fuxin in the east, crosses the two cities of Hebei, Tianjin and Liaoning provinces. It is a belt-shaped mountainous area that turns east-west to the northeast. The area has been violently subsided since the Archean. More than ten thousand meters, is the oldest sedimentary rock system in our country. Lower Paleozoic scattered in the Yanshan area, but to the east, south is widely distributed, the thickness of more than one kilometer. This huge set of ancient carbonate rocks has not attracted the attention of our petroleum geologists in the past. In 1975 Ji