Lithologic Reservoirs ›› 2016, Vol. 28 ›› Issue (6): 45-51.doi: 10.3969/j.issn.1673-8926.2016.06.007

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Organic geochemical characteristics of shale of Xujiahe Formation in the southern Longmen Mountain foreland basin

Zhou Qiwei1， L i Yong1， Wang Zhengjiang2， Y u Qian2， Wang Jincheng3， Wang Weiming1   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation， Chengdu University of Technology，Chengdu 610059， China； 2. Chengdu Center of Geological Survey， China Geological Survey， Chengdu 610081， China；3. Research Institute of Exploration and Development， PetroChina Dagang Oilfield Company， Tianjin 300280， China
  • Received:2016-07-13 Revised:2016-08-21 Online:2016-11-10 Published:2016-11-10

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Abstract: With the possibility of shale gas accumulation, the shale of the Upper Triassic Xujiahe Formation is well developed in the southern Longmen Mountain for-land basin, but the degree of prospecting is low. Based on the field profile mea-surement and fixed-point sampling, rock pyrolysis experiment, TOC determination, the test of vitrinite reflectance （Ro） and core data, the organic geochemical characteristics of shale was analyzed. The results show that the TOC content of shale ranges from 1% to 2%, reaching fair-good according to gas generation standards. Kerogen is mainly Ⅲ type, secondly Ⅱ2 type. Being from 0.8% to 1.7% generally, some above 2.0%, the maturity of organic matter is at the mature to high mature stage of evolution. Through the analysis of the organic geochemical characteristics and geologic parameters （porosity, burial depth and effetive thickness） of the shale of Xujiahe Formation, it is considered that the fifth member and third member of Xujiahe Formation are favorable for shale gas exploration in the southern Longmen Mountain foreland basin.

Key words: the genesis of oil and gas, water, phase transition, fault, theory of water phase transitions controlling hydrothermal mineralization

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