| 石英矿物类型及其对页岩气富集开采的控制:以四川盆地及其周缘五峰组-龙马溪组为例 |
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| 引用本文： | 孙川翔,聂海宽,刘光祥,张光荣,杜伟,王濡岳.石英矿物类型及其对页岩气富集开采的控制:以四川盆地及其周缘五峰组-龙马溪组为例[J].地球科学,2019,44(11):3692-3704. |
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| 作者姓名： | 孙川翔 聂海宽 刘光祥 张光荣 杜伟 王濡岳 |
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| 作者单位： | 1.页岩油气富集机理与有效开发国家重点实验室, 北京 100083 |
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| 基金项目： | 国家科技重大专项2016ZX05061-001国家自然科学基金项目41872124 |
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| 摘 要： | 页岩矿物组成控制着页岩的储层类型和岩石力学性质，并影响着页岩气的富集和开发.为了分析不同类型石英矿物的纵向变化特征及其对页岩气富集开采的控制作用，以四川盆地及其周缘五峰组-龙马溪组WF2-LM4和LM5-LM8两个笔石带页岩为主要研究对象，利用普通薄片观察、扫描电镜、矿物成岩世代关系、能谱分析等手段，识别出陆源碎屑石英、生物成因石英和黏土矿物转化过程中形成的3种石英类型.结果表明不同的页岩层段，3种成因的石英含量不同.生物成因石英在WF2-LM4笔石带页岩最为富集，向上到LM5-LM8笔石带页岩逐渐减少.在WF2-LM4笔石带页岩，生物成因石英与有机碳含量呈明显的正相关性，有利于页岩优质储层的形成，对页岩储层的压裂改造具有积极作用，实现了页岩赋气和改造的有机统一.研究认为四川盆地及其周缘地区五峰组-龙马溪组一段下部黑色页岩（WF2-LM4笔石带页岩）具有生物成因石英含量高，页岩生烃、储集能力和可压裂性最优的特点，是页岩气富集开采的有利层段.
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| 关 键 词： | 页岩气 生物成因石英 五峰组 龙马溪组 四川盆地 油气地质 |
| 收稿时间： | 2019-02-03 |
Quartz Type and Its Control on Shale Gas Enrichment and Production: A Case Study of the Wufeng-Longmaxi Formations in the Sichuan Basin and Its Surrounding Areas,China |
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| Abstract: | Mineral compositions control the type and key physical properties of shale gas reservoir. To analyze the characteristics of different types of quartz minerals in the longitudinal direction and their effects on shale gas enrichment and development, two graptolite shale zones are scrutinized including WF2-LM4 and LM5-LM8 of the Wufeng-Longmaxi Formations in the Sichuan basin and its surrounding areas. Three types of quartz are identified which are detrital quartz, biogenic quartz and quartz sourced from clay mineral reactions by means of thin section examination, scanning electron microscopy(SEM), mineral diagenesis and energy spectrum analysis. The contents of the three types of quartz vary in different shale intervals. Biogenic quartz is most abundant in the WF2-LM4 graptolite shale zone and gradually decreases upward to the LM5-LM8. In the WF2-LM4 graptolite shale zone, there is a clear positive correlation between biogenic quartz and organic carbon content, which is conducive not only to the formation of favorable shale reservoirs but also to the fracturing of shale reservoirs, realizing the integrity of shale gas enrichment and formation stimulation. The development areas of black shale from the Wufeng Formation and the first section of the Longmaxi Formation (WF2-LM4 graptolite shale zone) are identified as favorable targets providing abundant material basis for shale gas enrichment. |
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