Journal of Jilin University(Earth Science Edition) ›› 2018, Vol. 48 ›› Issue (1): 1-14.doi: 10.13278/j.cnki.jjuese.20160265

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Sedimentary Model and Distribution of Organic-Rich Shale in the Sequence Stratigraphic Framework: A Case Study of Lower Cambrian in Upper Yangtze Region

Liu Zhongbao1,2,3, Du Wei3, Gao Bo3, Hu Zongquan3, Zhang Yuying4, Wu Jing3, Fen Dongjun3   

  1. 1. State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 100083, China;
    2. Key Laboratory of Shale Oil/Gas Exploration and Production, SINOPEC, Beijing 100083, China;
    3. Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 100083, China;
    4. Research Institute of Unconventional Oil & Gas Renewable Energy, China University of Petroleum, Qingdao 266580, Shandong, China
  • Received:2017-09-02 Online:2018-01-26 Published:2018-01-26
  • Supported by:
    Supported by National Science and Technology Major Project(2016ZX05060,2016ZX05061) and SINOPEC Ministry of Science and Technology (P15114)

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Abstract: Taking the lithostratigraphy complicated Lower Cambrian in the Upper Yangtze region as an example, guided by the theory of high resolution sequence stratigraphy, based on the outcrop, rock core, thin section and drill data, we identified 6 standards to divide sequence stratigraphy and 5 sedimentary cycles of combination style. The interface of shale sequence stratigraphy is difficult to identify, and the recognition of different grades of depositional cycle is the key factor. Based on the above, combined with the study of tectonics, lithofacies and organic carbon content, we established isochronous sequence stratigraphic framework and sedimentary model of rich organic shales, and carried out fine mapping of organic shale distribution based on the sequence units. The organic-rich shales are developed mainly in the early different grade of transgressive-regressive periods. The distribution of organic-rich shales in the different areas is varied. The organic-rich shales distribute mainly in Ziyang-Changning area in the Sichuan basin. There are four sets of organic-rich shales controlled by the poly-tectonic basement rift. A large set of organic-rich shales are developed in the western Hubei- eastern Chongqing, north- southeastern Guizhou and Yichang areas controlled by Early Cambrian upward flow of ocean currents. The distribution characteristics of organic-rich shales should be taken into consideration for shale gas exploration and exploitation.

Key words: shale, sequence stratigraphy, Qiongzhusi Formation, Niutitang Formation, Lower Cambrian, Upper Yangtze region, Sichuan basin

CLC Number: 

  • TE121.3
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