贵州剑河地区中寒武统石冷水组油苗地球化学特征及来源研究
Geochemical characteristics and oil-source correlation of the Middle-Cambrian oil seepages in Jianhe County, Guizhou Province
查看参考文献42篇
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文摘
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与麻江-凯里古油藏相邻的剑河地区中寒武统石冷水组油苗发育,这些油苗遭受了严重的生物降解作用。前人均认为这些油苗来源于下寒武统泥质烃源岩,但剑河地区还发育处于高-过成熟阶段的上震旦统陡山沱组泥质烃源岩。为了减少热成熟作用和生物降解作用对油源对比的干扰,本文采取催化加氢热解技术释放上震旦统-下寒武统泥质烃源岩干酪根中的键合态生物标志物,与麻江-凯里地区下寒武统烃源岩干酪根中的键合态生物标志物进行了对比研究。在综合分析各样品的生物标志物及其碳同位素组成特征的基础上,结合剑河地区的石油地质背景,对石冷水组油苗的烃源进行了研究。研究结果表明,剑河地区上震旦统陡山沱组泥岩的沉积环境与麻江-凯里地区下寒武统烃源岩相似,但与剑河地区下寒武统九门冲组泥质烃源岩存在明显差异,上震旦统陡山沱组泥质烃源岩的沉积母质类型也更为复杂。石冷水组油苗与凯里地区奥陶系和志留系油苗相似,均为生物降解油与未生物降解油的混合物,且来源于上震旦统-下寒武统泥质烃源岩;剑河地区上震旦统-下寒武统泥质烃源岩可能存在二次生烃,所生成的烃类两次充注于中寒武统石冷水组地层中,前期供烃遭受了严重的生物降解作用,后期的供烃则较少受到生物降解作用的影响。 |
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其他语种文摘
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Jianhe County is located in the eastern part of Southern Guizhou Depression, near the Majiang-Kaili paleo-reservoir. There are abundant oil seepages storing in the Middle-Cambrian Shilengshui Formation (∈2s) sandstone in Jianhe County. Some previous work held the point that those oil seepages were sourced from the Lower-Cambrian source rocks by routine biomarkers. However, there also exist the Upper-Sinian source rocks which are currently over-mature, and those oil seepages had suffered heavy biodegradation. In order to minimize the influences of biodegradation and thermal maturation, our research has applied the catalytic hydropyrolysis for releasing covalently bound biomarkers from the kerogen of the Upper-Sinian to Lower-Cambrian source rocks in Jianhe County and then compared them with source rocks and oil seepages in the Kaili-Majiang area. The biomarkers and n-alkanes released from oil samples and source rocks via the extraction and catalytic hydropyrolysis have been analyzed by GC-MS and GC-C-IRMS. Based on the experimental data and the petroleum geological settings, the oil-source correlations for those oil seepages were made in this study. It indicates that there existed some differences in the depositional environment and sedimentary parent material types among the Lower-Cambrian source rocks, the Upper-Sinian source rock in the Jianhe County and the Lower-Cambrian source rock in the Kaili-Majiang County. The ∈_2s oil seepage was the mixture of severe biodegraded oil and non-biodegraded oil, which originated from the Upper-Sinian to Lower-Cambrian source rocks. And the Upper-Sinian to Lower-Cambrian source rocks could have secondary hydrocarbon generation, which resulted in the phenomenon that the ∈_2S sandstone was charged at least twice. The first charge could suffer heavy biodegradation, while the other charge could suffer less biodegradation. |
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来源
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地球化学
,2015,44(5):493-504 【核心库】
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关键词
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油苗
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生物标志物
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碳同位素组成
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催化加氢热解
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油源对比
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地址
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1.
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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广州海洋地质调查局, 广东, 广州, 510075
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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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十二五油气专项
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有机地球化学国家重点实验室135项目
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“十二五”油气专项课题
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有机地球化学国家重点实验室135项目的资助
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文献收藏号
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CSCD:5509312
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