Depositional characteristics and its geological significance of the Upper Triassic Xiaotangzi Formation in Sichuan Basin
Shi Zhensheng1,2, Zhao Zhengwang3, Jin Hui2, Song Haijing2
1 China University of Mining and Technology （Beijing），Beijing 100083 2 Research Institute of Petroleum Exploration & Development-Langfang，PetroChina，Langfang 065007，Hebei 3 PetroChina Southwest Oil & Gas Field Company，Chengdu 610051，Sichuan
Abstract：Correct understanding of depositional systems of the Upper Triassic Xiaotangzi Formation of Sichuan Basin，is not only conducive to the restoration of the early Late Triassic palaeogeography，but also helps to be a correct evaluation of hydrocarbon potential.Comprehensive analysis of outcrops and single well manifest 3 types of depositional systems，namely，delta，barrier island-lagoon and shallow shelf，developed.Delta depositional systems are mainly distributed in the northwest and southwest of Sichuan，with a small delta developed in central Sichuan.Barrier island-lagoon depositional system is chiefly located in central and southern Sichuan，shallow shelf depositional system situated in the middle of western Sichuan Basin. In the Late Triassic，collision of the Yangtze Plate and North China Plate closed from east to west，leading to uplifting of the northern section of the Longmenshan Mountain and formation of the delta depositional systems in northern Sichuan.Provenance of the southern section of the western Sichuan is from Kangdian Old Land.In central and southern Sichuan，because of flat terrain and strong tidal reworking，a barrier island-lagoon depositional system formed.Be a large area of distribution of thick source rocks，with Ⅱ-Ⅲ kerogen mainly argillaceous source rock has a wide scope of carbon content and high organic carbon content of maturity.In shallow shelf areas and the lagoon subfacies，source rock with type Ⅱ kerogens based，TOC content has the highest average content of greater than 2％.In remote sand bar and prodelta，TOC content is higher，ranging from 2％ to 3％，and type Ⅲ kerogen based.
Shi Zhensheng,Zhao Zhengwang,Jin Hui et al. Depositional characteristics and its geological significance of the Upper Triassic Xiaotangzi Formation in Sichuan Basin[J]. JOPC, 2012, 14(4): 477-486.
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