四川盆地西南部中二叠统白云岩成因分析——来自锶同位素、稀土元素证据

冯 轲; 徐胜林; 陈洪德; 董翼昕

doi:10.11932/karst20180503

四川盆地西南部中二叠统白云岩成因分析——来自锶同位素、稀土元素证据

doi: 10.11932/karst20180503

1.
成都理工大学沉积地质研究院,成都 610059/油气藏地质与开发工程国家重点实验室,成都 610059
2.
成都理工大学沉积地质研究院,成都 610059/油气藏地质与开发工程国家重点实验室,成都 610060
3.
成都理工大学沉积地质研究院,成都 610059/油气藏地质与开发工程国家重点实验室,成都 610061
4.
成都理工大学沉积地质研究院,成都 610059/油气藏地质与开发工程国家重点实验室,成都 610062

基金项目: 国家自然科学基金青年基金项目（41602107）;成都理工大学中青年骨干教师培养计划项目（JXGG201537、JXGG201538）

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出版历程
- 发布日期: 2018-10-25

Genesis of the Middle Permian dolomite in the southwestern Sichuan basin: Evidence from strontium isotope and rare earth elements

1.
Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu,Sichuan 610059, China/State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu,Sichuan 610059, China
2.
Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu,Sichuan 610059, China/State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu,Sichuan 610060, China
3.
Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu,Sichuan 610059, China/State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu,Sichuan 610061, China
4.
Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu,Sichuan 610059, China/State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu,Sichuan 610062, China

摘要

摘要: 白云岩作为优质的油气储层，其成因一直是沉积学研究热点，通过地球化学分析揭示其流体性质是探究白云岩成因的重要途径。本文通过对川西南中二叠统典型剖面和钻井的碳酸盐岩样品进行岩石学、稀土元素和锶同位素特征研究，分析结果显示：（1）其岩石类型主要有石灰岩、泥微晶白云岩、细-中晶白云岩和鞍形白云石4种。（2）研究区白云岩锶同位素比值（平均值0.709 77）明显高于石灰岩和同期海水，接近全球壳源锶同位素平均比值，显示白云岩化流体是热液来源，同时部分泥微晶白云岩显示海水锶同位素特征。（3）研究区碳酸盐岩相较于同期海相沉积物有较高的δCe值（平均值0.86），显示其开放的成岩环境。（4）3种类型的白云岩相较于石灰岩有较高的δEu值（平均值0.99）和显著不同的稀土总量特征，显示研究区白云岩与石灰岩成岩流体性质不同且白云岩受到高温影响。综合分析表明，川西南地区白云岩主要是受构造控制的热液白云岩，部分为被岩浆和热液加热的海水改造的热对流白云岩。
- 川西南地区 /
- 中二叠统 /
- 锶同位素 /
- 稀土元素 /
- 白云岩成因 /
- 热液白云岩 /
- 热对流白云岩
Abstract: As a high quality oil-gas reservoir, dolomite has long been a focused topic in sedimentology. It is an important appraoch to investigate the origin of dolomite through geochemical analysis to reveal the fluid property. This paper presents a comprehensive study of petrology, rare earth elements (REEs), oxygen, carbon and strontium isotopes in the outcrop sections and drilling samples of Middle Permian, in SW Sichuan Basin. The results show that ①the carbonate has 4 types: limestone, micrite-silty dolomite, finely-medium crystalline dolomite and saddle dolomite. ②The strontium isotope ratio (Avg.0.70977) in the research area is higher than that of contemporaneous limestone and seawater, indicating that dolomitic fluid is foreign. At the same time, some micrite-silty dolomites show the strontium isotopic characteristics of seawater. ③ Compared with normal marine sediments, the carbonate rocks in the research area have higher δCe (0.86 on average), showing an open diagenetic environment. ④Dolomites have higher δEu (0.99 on average) and significantly different REE content and differentiation, implying the dolomite and limestone have different diagenetic fluids and the dolomite has been affected by high temperature. Analysis indicates that the dolomites in southwestern Sichuan Basin are mainly hydrothermal dolomites controlled by structure, and some are thermal convection dolomite reformed by seawater heated by magma and hydrothermal fluid.
- southwestern Sichuan /
- Middle Permian /
- rare earth elements /
- strontium isotopes /
- origin of dolomite /
- hydrothermal dolomite /
- thermal convection dolomite

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