收稿日期: 2011-07-15
修回日期: 2011-08-03
网络出版日期: 2011-10-10
基金资助
国土资源部地质调查项目(编号:1212010733507)资助.
Evaluation of Carboniferous Source Rocks in Qaidam Basin
Received date: 2011-07-15
Revised date: 2011-08-03
Online published: 2011-10-10
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900 m；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400~500 m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。
李陈, 文志刚, 徐耀辉, 杜宇斌, 刁帆, 张磊 . 柴达木盆地石炭系烃源岩评价[J]. 天然气地球科学, 2011 , 22(5) : 854 -859 . DOI: 10.11764/j.issn.1672-1926.2011.05.854
By means of field geological investigation,we speculate the distribution of Carboniferous source rocks.We use the geochemical parameters (i.e.organic matter abundance,kerogen type,thermal maturity) to comprehensive evaluate the hydrocarbon generation potential of source.The Carboniferous source rocks widely developed in most area of Qaidam basin.The maximum thickness of 900m is located in the Oulongbuluke Mountain in the northern margin of basin,the thickness of source rock in the Gerermu-Wutumeiren-Gansen area of the south margin is about 400-500m as zonal shape distribution along the basin margin.The thickness in the northwest and the southeast parts become thin.The Carboniferous source rocks in Qaidam basin are composed of dark mudstone,carbonate rocks and coals.The dark mudstone as III and II kerogen type has an average value of organic carbon content of 1.28;the thermal maturity reach up to mature and high mature.Thus,the dark mudstone belongs to moderate to good source rocks.The carbonate rocks has a low organic carbon content,with average 0.37%,and the organic matter is Ⅱ1-Ⅱ2 type,hydrocarbon generation potential is poor.Coal is the good gas source rocks.So,the Carboniferous source rocks widely exist in the Qaidam basin,associated with the good petroleum exploration prospect.
Key words： Qaidam basin; Carboniferous; Distribution of source rock; Geochemistry.
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