Geological characteristics and exploration prospects of the Mesoproterozoic Changcheng System in Ordos Basin

doi:10.3969/j.issn.1672-7703.2024.05.005

Abstract

Abstract: The Mesoproterozoic Changcheng System was the first set of sedimentary cap rocks in Ordos Basin, with a wide distribution area but low degree of study and exploration. By using field outcrops, drilling results of risk exploration well PT1, and 3D seismic data, a systematic study is conducted on stratigraphic correlation and distribution, sedimentary facies, and source rock characteristics in the Changcheng System. In Ordos Basin, five sets of formations were developed in Changcheng System from bottom to top, including Xiong’er Group, Baicaoping Formation, Beidajian Formation, Cuizhuang Formation, and Luoyukou Formation. The stratigraphic distribution characteristics vary in various rift troughs. In Jinshan rift trough, the five sets of formations were developed completely. In Dingbian rift trough, three sets of formations were developed, including Xiong’er Group, Baicaoping Formation and Beidajian Formation. While only Beidajian Formation was developed in Helan rift trough. The bathyal–shallow marine–coastal–delta sedimentary system was dominant in Changcheng System, intercalated with tidal flat deposits. Effective source rock in Cuizhuang Formation was encountered in Zhongtiaoshan in Xiong’er rift and several exploration wells in the secondary rift troughs, with the highest organic carbon content of 1.52% and average R_o of 2.32%, showing potential of large-scale hydrocarbon generation. The basin thermal evolution simulation shows that Cuizhuang Formation source rock entered the mature stage in the Middle Permian with R_o value of 0.5%, and entered dry gas generation stage in the late stage of the Early Cretaceous with R_o of 2.0%. The comprehensive study shows that the configuration between source rock and reservoir in Changcheng System was good in Ordos Basin, forming self-generation and self-storage type natural gas reservoirs. Furthermore, two exploration targets are optimally selected in Dingbian rift trough and Jinshan rift trough, providing direction for gas exploration “towards source rock” in deep formations in the basin.

Key words: Ordos Basin, Mesoproterozoic, Changcheng System, Cuizhuang Formation, sedimentary facies, source rock, exploration prospect

CLC Number:

TE11

Liu Gang, Yang Wenjing, Jing Xianghui, Bai Haifeng, Shi Baohong, Sun Yaping, Ren Junfeng, Pan Xing, Zhang Jianwu, Wei Jiayi. Geological characteristics and exploration prospects of the Mesoproterozoic Changcheng System in Ordos Basin[J]. China Petroleum Exploration, 2024, 29(5): 44-60.

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