| 中国南方存在印支期的油气藏——Re-Os同位素体系的制约 |
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| 引用本文： | 陈玲,马昌前,凌文黎,佘振兵,陈子万.中国南方存在印支期的油气藏——Re-Os同位素体系的制约[J].地质科技情报,2010,29(2). |
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| 作者姓名： | 陈玲 马昌前 凌文黎 佘振兵 陈子万 |
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| 作者单位： | 中国地质大学,地球科学学院,武汉,430074;中国地质大学,地质过程与矿产资源国家重点实验室,武汉,430074 |
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| 基金项目： | 中国石油化工股份有限公司研究项目，科技部国际合作与交流专项，国家自然科学重点基金项目 |
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| 摘 要： | 利用Re-Os同位素方法开展富含有机质的沥青、原油等的研究,是确定油气成藏时间和破坏时间有效的但极富挑战性的新途径,在国内尚无研究实例报道。以我国南方最大的古油藏之一的麻江古油藏中的沥青为主要对象,采用Re-Os同位素方法试图限定油气的成藏时间和破坏时间。研究表明,麻江古油藏的固体沥青Re、Os同位素质量分数分别在41.5×10-6～642×10-6和0.21×10-6～12.15×10-6之间,N(187Re)/N(188Os)比值较高,且变化范围较大,在270.90～4074.99之间,Os同位素组成指示中等放射成因,其N(187Os)/N(188Os)比值在0.3400～3.6557之间变化。所有沥青样品的模式年龄在28～144Ma之间变化,集中在85Ma左右。通过沥青Re-Os同位素研究,结合详细地质资料,认为麻江古油藏的成藏时间为印支期—早燕山期(144Ma之前),而油藏破坏时间为燕山晚期即85Ma左右。
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| 关 键 词： | 麻江古油藏 油气成藏年代学 沥青 Re-Os同位素 热电离质谱 |
Indosinian Hydrocarbon Accumulation in South China: A Re-Os Isotope Constrain |
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| CHEN Ling,MA Chang-qian,LIN Wen-li,SHE Zhen-bing,CHEN Zi-wan.Indosinian Hydrocarbon Accumulation in South China: A Re-Os Isotope Constrain[J].Geological Science and Technology Information,2010,29(2). |
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| Authors: | CHEN Ling MA Chang-qian LIN Wen-li SHE Zhen-bing CHEN Zi-wan |
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| Abstract: | Rhenium-Osmium isotope system is a new and challenging method used to determined the hydrocarbon accumulation and date of desdtruction. This paper reports a Re-Os approach to date the hydrocarbon accumulation and destruction time of the Majiang paleo-oil pool, one of the largest paleo-oil reservoirs in South China. The Re and Os contents in the bitumen vary from 41.5×10~(-6) to 642×10~(-6) and 0.21×10~(-6) to 12.15×10~(-6), respectively. Their ~(187)Re/~(188)Os ratios are characterized by high and variable range of 270.90 to 4 074.99, while their ~(187)Os/~(188)Os ratios are moderately radiogenic, ranging from 0.340 0 to 3.655 7. The Re-Os model ages for the bitumen vary between 28 Ma and 144 Ma, with an average of ～85 Ma. With conbination of the documented geological researches, the paper suggests that the Majiang hydrocarbon deposit should be finally accumulated at ～144 Ma of Indosinian to Early Yanshanian period, and destroyed at ～85 Ma of Late Yanshanian period. |
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| Keywords: | Majiang paleo-oil pool geochronology of hydrocarbon accumulation bitumen Re-Os isotope thermal ionization mass spectrometry |
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