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天然气地球科学

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碳酸盐岩缝合线与基质有机质特征对比

高岗，柳广弟，王成云，师生宝   

  1. 中国石油大学（北京）油气资源与探测国家重点实验室，北京 102249
  • 收稿日期:2013-10-14 修回日期:2014-01-30 出版日期:2014-08-10 发布日期:2014-08-10
  • 作者简介:高岗(1966-),男,陕西高陵人,副教授,博士,主要从事油气地质与油气勘探研究.E-mail:gaogang2819@sina.com.
  • 基金资助:
    国家自然科学基金项目“碳酸盐岩缝合线有机质富集与油气运移作用研究”（编号:41372142）资助.
     

A Comparative Study of the Organic Matter Characteristics of Stylolite and Matrix in Carbonate Rock

GAO Gang,LIU Guang-di,WANG Cheng-yun,SHI Sheng-bao   

  1. State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum,Beijing 102249,China
  • Received:2013-10-14 Revised:2014-01-30 Online:2014-08-10 Published:2014-08-10

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摘要：

缝合线作为碳酸盐岩重要的地质现象，是碳酸盐岩有机质富集和流体排出的重要场所，对碳酸盐岩缝合线与基质有机质丰度的对比，有助于了解碳酸盐岩缝合线的有机质富集与排烃特征。通过碳酸盐岩基质与缝合线物质酸不溶物、有机碳（TOC）含量及热解（Rock-Eval）分析，对基质与缝合线的有机质富集特征及其继承性关系、排烃特征差异进行了详细分析。酸不溶物含量是碳酸盐岩有机质含量的重要指示，具有较低酸不溶物含量的基质对应的有机质丰度较低，而较高酸不溶物含量的缝合线对应的有机质丰度较高。缝合线的有机碳含量、已生烃量和排烃量均高于基质，生烃潜力高于基质。缝合线作为烃源岩要优于基质。缝合线与基质的母质成熟度一致，它们的有机质丰度具有良好的继承性。缝合线的排烃条件好于基质，对碳酸盐岩烃类的生成、运移和聚集都具有一定意义。
 

关键词: 碳酸盐岩, 缝合线, 基质, 有机质丰度, 酸不溶物

Abstract:

As an important geological phenomenon in carbonate rocks,stylolites are the places where organic matter is enriched and fluid is discharged.The comparative study of organic matter abundance between stylolite and carbonate rock matrix is advantageous to understand organic matter enrichment and hydrocarbon expulsion of stylolite.By analysis of the content of insoluble matter in acid,total organic carbon (TOC) and pyrolytical (Rock-Eval） products of carbonate rock and stylolite,detailed study has been carried out on the enrichment characteristics,inheritance,hydrocarbon expulsion differentials of organic matter in matrix and stylolite.The content of insoluble matter in acid is an important index of organic matter abundance of carbonate rocks.Matrix with low level of insoluble matter normally corresponds to low amount of organic matter,while the stylolites with high level of insoluble matter will correspond to high level of organic matter.As a source rock,stylolite is much better than matrix.The stylolite has better TOC,generated and expelled hydrocarbon,and its hydrocarbon generation potential is similar to that of matrix.Their organic matter abundance had good succession.The difference of generated hydrocarbon amount per unit mass TOC between stylolite and matrix indicated that hydrocarbon expulsion conditions in stylolite were superior to that in matrix.Stylolite is significant to generation,expulsion and accumulation of hydrocarbon.
 
 

Key words: Carbonate rock, Stylolite, Matrix, Organic matter abundance, Insoluble matter content in acid

中图分类号: 

  • TE122.3

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