Reservior sedimentary response to tectonic movement of the Late Triassic in front of Dabashan and Longmen Mountains
Gao Zhiyong1，2 Bai Bin1，2 Zhu Rukai1，2 Liu Liuhong1，2 Feng Jiarui1，2 Mei Jialuo3
1 Petroleum Geology Research and Laboratory Center, Research Institute of Petroleum Exploration and Development, Beijing 100083;
2 State Key Laboratory of Enhanced Oil Recovery, Research Institute of Petroleum Exploration and Development, Beijing 100083;
3 Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, Hubei
The evolution of sedimentary facies，X-rays fluorescence analysis of sandstone and mudstone，and petrographic thin section were used in the research on Fankuai and Xiaotangzi sections in Sichuan foreland basin. We found that the sedimentary environment，palaeoclimate，palaeo-salinity and clastic compositions are relevant to the Indosinian movement of the Late Triassic.The tidal sedimentary environment is developed in the early stage of late-Indosinian movement.The warm palaeoclimate and high palaeosalinity are appeared at the same time. During the depositional period of Member 2 of Xujiahe Formation，the depth of sedimentary water is shallow，and the salinity is high，and the climate changes cool.But during the depositional period of Member 3 of Xujiahe Formation，the climate changes warm again and the salinity reduces.After the Anxian tectonic movement, during the depositional period of member 4 of Xujiahe Formation,the salinity is lower than before，and the continental deposits occur in Sichuan foreland basin.The depth of the sedimentary water is shallow and the climate changes cool.The composition of sandstone,controlled by the late-Indosinian movement, shows the evolution of the provenance in front of Dabashan and Longmen Mountains.
Gao Zhiyong,Bai Bin,Zhu Rukai et al. Reservior sedimentary response to tectonic movement of the Late Triassic in front of Dabashan and Longmen Mountains[J]. JOPC, 2012, 14(6): 801-812.
