 The fengcheng formation is a source rock located in the Yungar Basin, China. It consists of alkaline lacustrine deposits that contain high levels of organic matter and are rich in hydrocarbon generation potential. Three distinct zones within the formation can be identified based on their mineral composition and organic content. The inner zone is composed primarily of lamalginite and talalginite which are highly mature and have high pH values. The transitional zone is characterized by high total organic carbon, TOC, with predominantly type I and type 2-1 caragens. The marginal zone is less mature and has lower TOC but is still rich in type 2-2 caragens. These three zones demonstrate varying degrees of hydrocarbon generation potential, suggesting that the fengcheng formation may be suitable for hydrocarbon exploration. This article was authored by Mingjia and I, Yuan Yuan Zhang, Yong Tang, and others. We are article.tv, links in the description below.