塔里木盆地寒武系干酪根催化加氢热解产物中正构烷烃的分布与碳同位素组成特征
Distribution and carbon isotopic compositions of n-alkanes from the catalytic hydropyrolysis of the Cambrian kerogen in the Tarim Basin
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文摘
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近年来塔里木盆地的深层油气勘探取得突破,有必要对寒武系高-过成熟烃源岩的有机质碳同位素组成进行深入研究,已有工作对干酪根催化热解产物中正构烷烃碳同位素组成的关注不多。本文对来自塔里木盆地内钻井和西缘露头的8个寒武系烃源岩干酪根进行了催化加氢热解实验。结果表明,氢解产物无论碳数分布还是分子碳同位素组成特征都表现出较大的变化。盆地内钻井烃源岩干酪根催化加氢热解产物中低碳数正构烷烃(C_(14)~C_(20))具有明显的偶碳优势,部分样品C_(22)正构烷烃优势明显;而柯坪地区露头样品干酪根催化加氢热解产物中正构烷烃不具有或具有微弱的偶碳数优势。钻井和柯坪露头烃源岩干酪根催化加氢热解产物中正构烷烃的碳同位素组成均随碳数增加逐渐变轻,低碳数正构烷烃(C_(14)~C_(20))碳同位素组成没有明显偶碳数偏重的分布特征。此外,柯坪露头烃源岩正构烷烃的碳同位素组成(–34.5‰ ~ –31.5‰)明显比盆地内钻井烃源岩中的正构烷烃(–32.3‰ ~ –26.4‰)偏轻,这一变化与干酪根总碳同位素组成的变化一致。正构烷烃及其碳同位素分布特征的差异可能主要反映了烃源岩沉积时期,分层水体导致有机质母源或沉积环境的变化。除了寒武、奥陶系烃源岩有机质碳同位素组成上的差异,如何利用同位素手段对中-下寒武统烃源岩自身变化进行油源判识,也是亟需考虑的问题。 |
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其他语种文摘
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Recent progresses of deep oil and gas exploration in the Tarim Basin requires a detailed study of the carbon isotopic composition of organic matter in over-mature Cambrian source rocks. Concerns have been raised about the carbon isotopic composition of n-alkanes in the products of catalytic pyrolysis of kerogen. In this paper, catalytic hydropyrolysis was performed on eight Cambrian kerogens extracted from core samples in the basin and western outcrops of the basin. The results show significant variations in both the distribution and carbon isotopic composition of n-alkanes. The low-carbon-number n-alkanes (C14-C20) from core samples show obvious even-odd carbon-number predominance; in some samples, the relative abundance of C_(22) n-alkanes was very high. However, the n-alkanes in hydropyrolysis products of kerogens from the Keping outcrops did not possess or have weak even-carbon-number predominance. The carbon isotopic compositions of n-alkanes in the hydrolysis products gradually decreased with the increase of carbon number, and the carbon isotopic composition of low-carbon-number n-alkanes had no obvious distribution characteristics. In addition, the carbon isotopic compositions (–34.5‰ - –31.5‰) of the n-alkanes from the Keping outcrops were significantly lighter compared with n-alkanes (–32.3‰ - –26.4‰) from core samples in the basin, which is consistent with variations in the total carbon isotopic composition of kerogens. The difference in the distribution and carbon isotopes of n-alkanes could reflect large variations in sources or sedimentary environment as a result of stratified water bodies during the sedimentary period of hydrocarbon source rocks. Therefore, variations in the carbon isotopic signatures of Cambrian source rocks should be considered when determining the oil source as well as the differences of carbon isotopic compositions between Cambrian and Ordovician sources. |
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来源
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地球化学
,2019,48(5):447-457 【核心库】
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DOI
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10.19700/j.0379-1726.2019.05.002
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关键词
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碳同位素
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正构烷烃
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催化加氢热解
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寒武系
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塔里木盆地
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地址
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中国科学院广州地球化学研究所, 有机地球化学国家重点实验室, 广东, 广州, 510640
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中国科学院大学, 北京, 100049
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中国石油塔里木油田分公司, 新疆, 库尔勒, 841000
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0379-1726 |
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学科
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地质学 |
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基金
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国家自然科学基金
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有机地球化学国家重点实验室自主项目
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文献收藏号
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CSCD:6580888
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