塔里木盆地下寒武统底部高熟海相烃源岩中有机质的赋存状态

于炳松; DongHailiang; 陈建强; 陈晓林; 梁世友; 林畅松

塔里木盆地下寒武统底部高熟海相烃源岩中有机质的赋存状态

1.
中国地质大学岩石圈构造、深部过程及探测技术教育部重点实验室, 北京 100083
2.
Department of Geology, Miami University, Oxford, OH 45056, USA

基金项目:

国家自然科学基金项目 40172042

国家自然科学基金项目 40228004

国家"973"项目 G1999043304

国家博士学科点专项基金项目 200049107

详细信息

作者简介:
于炳松(1962-), 男, 教授, 主要从事沉积和地球化学方向的研究

中图分类号: P618.1
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出版历程
- 收稿日期: 2003-09-02
- 刊出日期: 2004-03-25

Occurrence of High Mature Organic Matter in Marine Black Shale Source Rocks of Lower Cambrian from Northern Tarim Basin, China

1.
Key Laboratory ofLithospheric Tectonics Deep-Level Process and Exploration, China University ofGeosciences, Ministry ofEducation, Beijing 100083, China
2.
Department ofGeology, Miami University, Oxford, OH 45056, USA

摘要

摘要: 近年来的研究证明, 中新生代未熟-低熟海相富有机质泥质烃源岩中有机质是通过溶解在水中的分子规模的碳有机质以化学吸附的形式被吸附到矿物表面上和蒙脱石结构层内.然而, 对于高熟海相泥质烃源岩中有机质的赋存状态却少有报道.通过对塔里木盆地下寒统底部高熟海相泥质烃源岩的有机碳含量、矿物表面积、扫描电镜和透射电镜的综合分析, 得到了其有机质以细小的颗粒状保存于沉积物颗粒之间的结论.同时, 通过高熟海相烃源岩与现代未熟海相烃源岩有机质赋存状态的对比, 提出了值得进一步研究的有关科学问题.
- 海相烃源岩 /
- 有机质赋存状态 /
- 塔里木盆地
Abstract: More and more evidences indicate that the organic matter (OM) in immature organic-rich sediments and sedimentary rocks is chemically absorbed onto the external surfaces of minerals and into interlayer (internal) surfaces of smectitic clay minerals in the form of amorphous molecular scale carbon OM. But there are few reports about the occurrence of high mature OM in marine black shale petroleum source rocks. This paper studies the occurrence of high mature OM in the black shale of basal Cambrian from the northern Tarim basin. Based on the comprehensive analysis of total organic carbon contents (TOC), maximum thermolysis temperatures (T_max) of OM, mineral surface areas (MSA), scanning electronic microscope (SEM) and transmission electronic microscope (TEM) of the black shale, it concludes that the high mature OM in the marine black shale of the basal Cambrian from the basin occurs in the state of particulates ranging from 1 to 5 microns in diameter. The contrast of the existing state of the high mature OM in the black shale with that of the immature one in the modern marine continental margin sediments has brought some scientific problems, which are valuable to study in detail.
- marine black shale petroleum source rock /
- occurrence of high mature organic matter /
- Tarim basin

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图 1 阿克苏肖尔布拉克寒武系底部柱状剖面及采样位置

1.白云岩; 2.泥页岩; 3.硅质岩; 4.颗粒灰岩; 5.磷块岩; 6.采样点位置及编号

Fig. 1. Column and sample locations of black shale at bottom of the Cambrian in Xiaoerbulake outcrop section, Akesu area, Tarim basin

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图 2 黑色页岩中有机碳含量与矿物表面积关系

Fig. 2. Correlativity between TOC in black shale and mineral surface area of minerals

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图 3 烃源岩的SEM图像

Q.石英; I.伊利石

Fig. 3. SEM image of black shale

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图 4 颗粒状有机质的TEM图像

Org.有机质; Q.石英

Fig. 4. TEM image of grainy organic matter

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图 5 有机质TEM能谱分析结果

颗粒状有机质的TEM能谱分析显示, 只有一个碳成分峰, 说明此颗粒的成分为碳有机质

Fig. 5. TEM energy dispersive spectroscopy of organic matter

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图 6 有机质TEM电子衍射图像

颗粒状有机质的电子衍射图上无晶格相, 显示为非晶质体

Fig. 6. TEM electronic diffraction image of organic matter

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图 7 自生伊利石TEM图像

Q.石英; I.伊利石.未见自生伊利石边缘的有机质包壳

Fig. 7. TEM image of autogenetic illite

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表 1 黑色页岩有机碳含量、最高热解温度和矿物表面积分析结果

Table 1. Analytical results of TOC, T_max and MSA in black shale

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