Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (4): 1060-1072.doi: 10.13278/j.cnki.jjuese.201504110

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Characteristics of Typical Hybrid Shale-Oil System in North America and Its Implications

Li Zhiming1,2, Rui Xiaoqing1,2, Li Maowen1,2, Cao Tingting1,2, Xu Ershe1,2, Tao Guoliang1,2, Jiang Qigui1,2   

  1. 1. Wuxi Research Institute of Petroleum Geology, RIPEP, SINOPEC, Wuxi 214151, Jiangsu, China;
    2. Key Laboratory of Petroleum Accumulation Mechanisms, SINOPEC, Wuxi 214126, Jiangsu, China
  • Received:2014-11-25 Published:2015-07-26

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Abstract:

The Bakken Formation of Williston basin in North America is a typical hybrid shale-oil system. The characteristics of geology and geochemistry, porosity and permeability, micro-fracture development, and shale oil for organic-rich shales and juxtaposed organic-lean intervals, are systematically analyzed in this paper. The results show that the shale oil sweet point is mainly controlled by the mature shale, which is rich in organic matter and high content of light oils, abnormal pressure, well-developed micro-fractures, and dolomitization in organic-lean intervals all together. Meanwhile, organic-lean intervals are the main shale oil productive layer in hybrid shale oil system due to its relative high porosity, permeability, and low adsorptive capacity. This has an important implication for discovering the causes that the continental shale oil exploring results are not desirable in Eastern China. The subjective factor is that only organic rich shale and mudstone are taken as shale oil exploration targets; while the objective factors are that the development of natural micro-fracture is limited in organic-rich shale and mudstone but the organic-lean intervals, and the retained oil is mainly existed in organic matter with high wax generated from lacustrine source rocks relative to marine source rocks; the maturity of organic-rich shale and mudstone is not high enough to generate lighter oil. Therefore, we suggest to enhance a fine evaluation and an exploration of organic-lean carbonate or silt and fine sandstone with thin intervals in mature organic-rich shale system; and mature organic-rich shale with open fractures is proposed for shale oil exploring in lacustrine face basins of Eastern China.

Key words: hybrid shale-oil system, Bakken Formation, Williston basin, shale oil exploring, Eastern China, North America, shale oil

CLC Number: 

  • P618.12

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