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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。
As an important geological phenomenon of carbonate rocks, sutures are an important site for the enrichment of organic matter and the discharge of fluids in carbonate rocks. Comparing the abundance of carbonate suture with matrix organic matter will help to understand the carbonate rocks Organic matter enrichment and hydrocarbon expulsion characteristics of suture. According to the acid-insoluble, organic carbon (TOC) content and Rock-Eval analysis of carbonate matrix and suture material, the relationship between the enrichment characteristics of organic matter and their inheritance of matrix and suture, Conducted a detailed analysis. The acid-insoluble content is an important indicator of the organic matter content of carbonate rocks. The matrix with lower acid-insoluble content has lower abundance of organic matter, while the higher acid-insoluble content of suture corresponds to higher abundance of organic matter. Suture organic carbon content, hydrocarbon generation and hydrocarbon expulsion were higher than the matrix, hydrocarbon generation potential is higher than the matrix. Sutures as source rocks are better than matrices. The sutures are consistent with the parent material of the matrix, and their organic abundance has good inheritance. The condition of hydrocarbon expulsion of suture is better than that of matrix, which is of significance to the formation, migration and accumulation of carbonate hydrocarbons.