Whole petroleum system in Jurassic coal measures of Taibei Sag in Tuha Basin, NW China

作者：Dongming Zhi, Jianzhong LI, Fan Yang, Xuan Chen, Chao Wu, Bo Wang, Hua Zhang, Jun Hu, Jikun JIN · 发表于：Petroleum Exploration and Development · 年份：2024 · DOI：10.1016/s1876-3804(24)60485-4 · 被引用次数：12 · 研究领域：Hydrocarbon exploration and reservoir analysis、Coal Properties and Utilization、Methane Hydrates and Related Phenomena

Based on the latest results of near-source exploration in the Middle and Lower Jurassic of the Tuha Basin, a new understanding of the source rocks, reservoir conditions, and source-reservoir-cap rock combinations of the Jurassic Shuixigou Group in the Taibei Sag is established using the concept of the whole petroleum system, and the coal-measure whole petroleum system is analyzed thoroughly. The results are obtained in three aspects. First, the coal-measure source rocks of the Badaowan Formation and Xishanyao Formation and the argillaceous source rocks of the Sangonghe Formation in the Shuixigou Group exhibit the characteristics of long-term hydrocarbon generation, multiple hydrocarbon generation peaks, and simultaneous oil and gas generation, providing sufficient oil and gas sources for the whole petroleum system in the Jurassic coal-bearing basin. Second, multi-phase shallow braided river delta–shallow lacustrine deposits contribute multiple types of reservoirs, e.g. sandstone, tight sandstone, shale and coal rock, in slope and depression areas, providing effective storage space for the petroleum reservoir formation in coal-measure strata. Third, three phases of hydrocarbon charging and structural evolution, as well as effective configuration of multiple types of reservoirs, result in the sequential accumulation of conventional-unconventional hydrocarbons. From high structural positions to depression, there are conventional structural and structural-lithological reservoirs ...