新疆石油地质 ›› 2018, Vol. 39 ›› Issue (zk(English) ): 74-81.

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Quantitative Characterization of Organic Matters with Different Occurrences in Argillaceous Source Rocks: A Case of Shahejie Formation, Dongying Sag

ZHAO Yue1,2, CAI Jingong2, LEI Tianzhu3, YANG Yan3, 4   

  1. 1. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China;
    2. State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China;
    3. Gansu Key Laboratory of Petroleum Resources/CAS Key Laboratory of Petroleum Resources, Lanzhou, Gansu 730000, China;
    4. Jidong Oilfield Company, PetroChina, Tangshan, Hebei 063004, China
  • 收稿日期:2017-11-29 修回日期:2018-03-05 出版日期:2019-01-01 发布日期:2021-05-19

Quantitative Characterization of Organic Matters with Different Occurrences in Argillaceous Source Rocks: A Case of Shahejie Formation, Dongying Sag

ZHAO Yue1,2, CAI Jingong2, LEI Tianzhu3, YANG Yan3, 4   

  1. 1. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China;
    2. State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China;
    3. Gansu Key Laboratory of Petroleum Resources/CAS Key Laboratory of Petroleum Resources, Lanzhou, Gansu 730000, China;
    4. Jidong Oilfield Company, PetroChina, Tangshan, Hebei 063004, China
  • Received:2017-11-29 Revised:2018-03-05 Online:2019-01-01 Published:2021-05-19
  • About author:ZHAO Yue, E-mail: zhyue_1991@136.com

摘要: The organic matters retained in argillaceous source rocks are of various occurrences, including free state and mineral-binding state organic matters which have quite different geochemical natures and different significance in detailed source rock evaluation. However, a comprehensive quantitative characterization technique for both occurrences has not been established yet. With the argillaceous source rocks sampled from the middle Es3, the lower Es3 and the upper Es4 of the Shahejie Formation, Dongying sag, and based on the analysis on the changes of pyrolysis parameters during the processes of solvent extraction and sequential chemical treatment including the variations of free hydrocarbon, cracked hydrocarbon and TOC, the paper measures the abundance of the organic matters with different occurrences quantitatively and establishes a quantitative characterization method of retained organic matters with different occurrences. The results show that the quantity of soluble organic matters of mineral-binding state is quite large in the organic matters retained in source rocks. Traditional evaluation methods such as Rock-Eval pyrolysis method and chloroform bitumen A method have some limitations. Profound study on the geochemical characteristics of the organic matters of mineral-binding state will widen the knowledge of hydrocarbon generation theory and retained hydrocarbon occurrences.

关键词: Dongying sag, Shahejie Formation, argillaceous source rock, retained organic matter, occurrence, quantitative characterization, sequential chemical treatment, Rock-Eval pyrolysis

Abstract: The organic matters retained in argillaceous source rocks are of various occurrences, including free state and mineral-binding state organic matters which have quite different geochemical natures and different significance in detailed source rock evaluation. However, a comprehensive quantitative characterization technique for both occurrences has not been established yet. With the argillaceous source rocks sampled from the middle Es3, the lower Es3 and the upper Es4 of the Shahejie Formation, Dongying sag, and based on the analysis on the changes of pyrolysis parameters during the processes of solvent extraction and sequential chemical treatment including the variations of free hydrocarbon, cracked hydrocarbon and TOC, the paper measures the abundance of the organic matters with different occurrences quantitatively and establishes a quantitative characterization method of retained organic matters with different occurrences. The results show that the quantity of soluble organic matters of mineral-binding state is quite large in the organic matters retained in source rocks. Traditional evaluation methods such as Rock-Eval pyrolysis method and chloroform bitumen A method have some limitations. Profound study on the geochemical characteristics of the organic matters of mineral-binding state will widen the knowledge of hydrocarbon generation theory and retained hydrocarbon occurrences.

Key words: Dongying sag, Shahejie Formation, argillaceous source rock, retained organic matter, occurrence, quantitative characterization, sequential chemical treatment, Rock-Eval pyrolysis