Lithologic Reservoirs ›› 2016, Vol. 28 ›› Issue (6): 1-8.doi: 10.3969/j.issn.1673-8926.2016.06.001

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Characteristics and classification of section structure of nonmarine organic-rich formations in Sichuan Basin

Zhou Wen 1，2， X u Hao 1，2， Deng Hucheng 1，2， Chen Wenling 1，2   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation， Chengdu University of Technology， Chengdu 610059， China；2. College of Energy Resources， Chengdu University of Technology， Chengdu 610059， China
  • Received:2016-06-05 Revised:2016-07-18 Online:2016-11-10 Published:2016-11-10

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Abstract: In order to reveal the characteristics of nonmarine organic-rich formations and the productivity of different types of stratigraphic structure sections, taking the Da’anzhai member of Jurassic Ziliujing Formation and the fifth member of Triassic Xujiahe Formation in Sichuan Basin as examples, this paper divided the statigraphic structure section by making the ratio of shale to gross and thickness of single sand （limestone） as standards based on the field observed profiles, drilling data and sedimentary settings, and compared with the structure sections of Bakken Formation in North America. The nonmarine organic-rich stratigraphic structure sections were divided into five types: tight sandstone （limestone）, sandstone-rich （limestone-rich） with shale, sandstone （limestone） and shale interbed, shale-rich with sandstone （limestone） and shale. The tight sandstone （limestone） oil and gas coexist with shale oil and gas in nonmarine organic-rich formations, and the shale oil and gas are mainly produced in the last three types of structure sections. There are multiple productive targets in nonmarine organic-rich formations, so, it is proposed that the formation of organic-rich shale interbedded with limestone or sandstone should be considered to explore as a whole.

Key words: SPE—PRMS standard, proved reserve, probable reserves, possible reserves, reservoir type

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