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OALib Journal期刊
ISSN: 2333-9721
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柴达木盆地石炭系烃源岩评价
Keywords: 柴达木盆地,石炭系,烃源岩展布,地球化学特征
Abstract:
？在野外地质调查基础上，系统分析了柴达木盆地石炭系烃源岩分布以及地球化学特征，并从有机质丰度、类型和成熟度方面对烃源岩进行了综合评价。研究认为:柴达木盆地石炭系烃源岩广泛分布在全盆地大部分地区。柴北缘烃源岩厚度大\,分布广，厚度中心主要位于欧龙布鲁克山一带，最大残余厚度达900m；柴南缘厚度次之，沿盆地边缘呈带状展布，在格尔木—乌图美仁—甘森一带厚度在400~500m之间，盆地西北及东南角厚度较小。石炭系主要发育暗色泥岩、碳酸盐岩和煤3种类型烃源岩。暗色泥岩有机质丰度均值为1.28%，有机质类型主要为ⅲ型与ⅱ2型，处于成熟—高成熟阶段，为中等—好的烃源岩；碳酸盐岩有机质丰度较低，平均值为0.37%，有机质类型为ⅱ1—ⅱ2型，综合评价为差烃源岩；石炭系煤岩则为良好的气源岩。总体而言，柴达木盆地石炭系分布广泛，具有较好的油气勘探远景。
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