Tectono-sedimentary response in the western Pan-Yangtze Craton during Dengying period
Exploration practices have revealed abundant oil and gas resources in the Neoproterozoic Upper Sinian Dengying Forma-tion,Sichuan Basin.To ascertain paleostructure controls on reservoir and its forming together with sedimentation,and to theoretically support the subsequent exploration in this formation,it is essential to study the tectono-sedimentary response during Dengying period.Thus,the western boundary of craton was discussed according to gravity and magnetic,tectonic and sedimentary data to make clear both distribution and genesis of paleo-rift.Moreover,sedimentary patterns were explored for the Upper Yangtze Craton during the Late Sinian Dengying period in line with the train of thought on structure-controlled depositional architecture.Results show that(i)for the Yangtze Craton,its west side extends westward to Jinshajiang-Honghe fault zone from Longmenshan-Anninghe fault zone,creating the so-called Pan-Yangtze Craton where is developed with three intra-cratonic rifts;(ii)the western Pan-Yangtze Craton is divided into two sub-cratonic basins of the east and the west through these rifts;(iii)the east sub-cratonic basin is dominated by dolomite in rela-tively restricted depositional setting,while the west of thicker limestone in relatively open setting;and(iv)with lateral connection,a superior source-reservoir assemblage which serves as the key exploration target in the Dengying Formation is built due to sedimentary buildup in the rifts or platform marginal zones on both sides of the craton.It is worth to note Wanyuan-Dazhou rift as an exploration prospect.
国家科技期刊平台
NSTL
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