TSM prototype basins on the Neoproterozoic Yangtze Craton

TSM prototype basins on the Neoproterozoic Yangtze Craton

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TSM basin analysis of Neoproterozoic prototype basins on Yangtze Craton, South China were arrethe bush balm studied using a large number of field outcrop sections, latest drilling data, and numerous previous studies.Controlled by the Qingbaikou convergent continental margin to the Nanhua-Sinian divergent continental margin, four phases of basin evolution are identified in the Neoproterozoic Yangtze Craton: a) the early Qingbaikou period(ca.1 000-820 Ma), with back-arc spreading basins on the western and northern Yangtze margins and the interior, and a retro-arc foreland basin on the southeastern Yangtze margin; b) the late Qingbaikou period (ca.820-720 Ma), with back-arc spreading basins on the western and northern Yangtze margins and extensional down-faulted basins on the southeastern Yangtze margin and the interior of the carton; c) the Nanhua period (ca.

720-635 Ma), with rift basins on the southeastern, western, and northern Yangtze margins and the interior; and d) the Sinian period (ca.635-541 Ma), with intracratonic rift basins in the interior of Yangtze Craton (i.e.the central Sichuan, the Wanyuan-Dazhou and the west Hubei-east Chongqing area) and divergent marginal subsidence basins on the southeastern and northern Yangtze margins.

The Nanhua rift basins and the Sinian gymnastics wall decals divergent marginal subsidence and intracratonic rift basins were most conducive to source rock formation.The southern Shaanxi, northeastern Sichuan, western Hubei, central Sichuan and the adjacent area of Hunan, Guizhou and Chongqing are the most favorable areas of the Neoproterozoic source rocks in the Yangtze Craton.They are also considered to be favorable regions for deep natural gas exploration on the Yangtze Craton.