Lithologic Reservoirs ›› 2016, Vol. 28 ›› Issue (6): 16-22.doi: 10.3969/j.issn.1673-8926.2016.06.003

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Typical cases analysis of effective source rocks existence in ancient carbonate rock of the middle basins of China

Xie Yunxin1， Zhou Wen1， Guo Min1， Chen Yicai1， Zhou Qiumei2
  

  1. 1. State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation， Chengdu University of Technology 610059，China； 2. Department of Energy and Mineral Engineering， Pennsylvania State University， University Park， PA， 16802， US）
  • Received:2016-08-10 Revised:2016-09-26 Online:2016-11-10 Published:2016-11-10

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Abstract: The question if ancient carbonate rocks can be effective source rocks was discussed through typical pyrolysis experiments results and examples in Ordos basin and Sichuan basin in middle of China. The results indicate that rocks such as marlstone and micrite with relatively high organic matter content have high quantity of hydrocarbon generation during pyrolysis experiments, and oil expulsion is probably difficult during primary migration, and gas expulsion is the main form which is mainly expulsed through microfracture and diffusion. It is suggested that marlstone and micrite with relatively high organic matter content are effective gas source rocks. This understanding provides theoretical basis for source rock evaluation of ancient carbonates.

Key words:  organic matter abundance, well logging calculation, shale gas, Longmaxi Formation, Changning area, Sichuan Basin

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