China Petroleum Exploration ›› 2018, Vol. 23 ›› Issue (4): 58-66.DOI: 10.3969/j.issn.1672-7703.2018.04.007

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Accumulation laws of recoverable resources in typical tight oil zones in North America

Zhang Xinshun1, Ma Feng1, Wang Hongjun1, Wang Keming1, Li Wenhao2, Qin Yanqun1   

  1. 1 PetroChina Research Institute of Petroleum Exploration & Development;
    2 Research Institute of Unconventional Oil and Gas and New Energy, China University of Petroleum(East China
  • Received:2017-03-27 Revised:2018-05-02 Online:2018-07-15 Published:2018-07-11
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Abstract: The accumulation law of recoverable tight oil resources has been a hot point in present studies. The distribution of oil resources in tight oil basins is firstly investigated based on multiple global unconventional databases, especially in three basins with high tight oil production:the Williston Basin, Permian Basin, and Gulf Basin in North America, and then control factors on the accumulation of the recoverable tight oil resources are analyzed from the conditions of hydrocarbon sources, the characteristics of stratigraphic assemblages, and the development of local sweet spots, based on field production performances of thousands of typical tight oil wells, with the purposes for providing basic data for the exploration of tight oil outside North America. The study results indicate that, geographically, recoverable tight oil resources are mainly distributed in conventional oil and gas areas such as the Cordillera front belt in the Americas, the Western Siberia in Russia, and the Paleo-Tethys region in North Africa-the Middle East; and geologically, they are dominant in the Cretaceous, Upper Devonian, Middle-Lower Permian and Upper Silurian formations, and related to the primary source rocks developed all over the world. These recoverable tight oil resources show three accumulation laws:close to extensively distributed source rocks with high abundance and moderate maturity; in tight reservoirs dominated by inter-source and interbedded assemblages; and in sweet spot zones developed on the slope belt close to sedimentary centers and weak in tectonic activity.

 

Key words: tight oil, North America, recoverable resources, distribution characteristics, accumulation law

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