上扬子奥陶纪层序岩相古地理重建及油气勘探启示

胡华蕊; 邢凤存; 侯明才; 段金宝; 张殿伟

doi:10.3799/dqkx.2018.338

Volume 44 Issue 3

Mar. 2019

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Hu Huarui, Xing Fengcun, Hou Mingcai, Duan Jinbao, Zhang Dianwei, 2019. Ordovician Sequence and Lithofacies Paleogeography Reconstruction in Upper Yangtze Region and Its Implications for Oil and Gas Exploration. Earth Science, 44(3): 798-809. doi: 10.3799/dqkx.2018.338

Citation:

Hu Huarui, Xing Fengcun, Hou Mingcai, Duan Jinbao, Zhang Dianwei, 2019. Ordovician Sequence and Lithofacies Paleogeography Reconstruction in Upper Yangtze Region and Its Implications for Oil and Gas Exploration. Earth Science, 44(3): 798-809. doi: 10.3799/dqkx.2018.338

Citation:

Hu Huarui, Xing Fengcun, Hou Mingcai, Duan Jinbao, Zhang Dianwei, 2019. Ordovician Sequence and Lithofacies Paleogeography Reconstruction in Upper Yangtze Region and Its Implications for Oil and Gas Exploration. Earth Science, 44(3): 798-809. doi: 10.3799/dqkx.2018.338

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Ordovician Sequence and Lithofacies Paleogeography Reconstruction in Upper Yangtze Region and Its Implications for Oil and Gas Exploration

doi: 10.3799/dqkx.2018.338

Hu Huarui^{1,2
,},
Xing Fengcun^{1,2
,
,},
Hou Mingcai^1,2,
Duan Jinbao³,
Zhang Dianwei⁴

1.
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China
2.
Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China
3.
SINOPEC Exploration Company, Chengdu 610041, China
4.
SINOPEC Petroleum Exploration and Production Research Institute, Beijing 100083, China

Received Date: 2018-10-07
Publish Date: 2019-03-15

Abstract

Abstract

There are different understandings about lithofacies paleogeographic features of Ordovician in Sichuan Basin, and its synsedimentary paleo-uplifts need further research.Using the latest well, seismic data and field data, a study on the Ordovician lithofacies paleogeography on the basis of the sequence stratigraphic division and comparison is carried out.The Ordovician third-order sequence stratigraphic framework in the Upper Yangtze region was established, and the lithofacies palaeogeography of the key stratigraphic sequence was reconstructed.The study reveals that the sedimentary filling texture of Ordovician was controlled by second-order sequence stratigraphy.The strata thickness varies in the lower of each second-order sequence stratigraphy, indicating distinct fluctuant paleogeomorphology.Third-order sequence stratigraphy overlied toward the paleo-uplift region resulting in the loss of strata.The range of paleo-uplift was reduced at the late stage of second-order sequence, and the stratigraphic thickness of the third-order sequence was generally stable as the result of filling.The analysis of lithofacies paleogeography reveals that stable uplifts surrounded the central depressions from three sides, including the north, west, and south during Ordovician, and paleo-uplift in central Sichuan divided central depressions into two parts clearly.It is believed that the paleo-uplift in the central Sichuan and the paleo-uplift on both north and south sides are characterized by intermittent expansion.An uplift area exists during SSQ2 in the east of Sichuan.The central depression has the characteristics of continuous settlement and eastward migration.The study reveals that Early Ordovician Tongzi Formation had inherited the overall paleogeographic background of Loushanguan Group of Cambrian, forming two gypsum rock areas and dolomitization grain shoals distributed around paleo-uplift.In addition, delta depositions sourced from the west of study area maybe existed during Meitan period.
- lithofacies paleogeography reconstruction,
- sequence stratigraphy,
- paleo-uplift,
- Ordovician,
- Sichuan Basin,
- petroleum geology

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References(38)

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Ordovician Sequence and Lithofacies Paleogeography Reconstruction in Upper Yangtze Region and Its Implications for Oil and Gas Exploration

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