摘要
///Donghetang Oilfield was located in the west of Tabei Uplift,Tarim Basin, and a series of oil and gas accumulations have been discovered around it. Hydrocarbons produced in the Donghe sandstone of Devonian (D3d) and Jurassic reservoirs were mainly derived from Mid-upper Ordovician source rocks. According to hydrocarbon charging history,the reservoirs were formed both in the late Hercynian and late Himalayan, but the early-accumulated oil and gas were generally biodegraded and destroyed in most places, and the normal hydrocarbons in present reservoirs were formed in the later stage. Based on geochemical characteristics and lateral and vertical comparison, the Ordovician and Silurian reservoirs lain underneath the Donghe sandstone could be the potential exploration formations.