海相页岩中斑脱岩发育特征及对页岩储层品质的影响——以涪陵地区五峰组—龙马溪组一段为例

发布时间：2018-05-19 20:39

本文选题：海相页岩 + 斑脱岩　；参考：《石油学报》2017年12期

【摘要】：以岩心精细描述为基础,借助全岩/黏土X射线衍射分析、氩离子抛光扫描电镜等测试技术,从斑脱岩发育特征、页岩储层品质和储层品质差异性发育机理3个方面,对涪陵地区上奥陶统五峰组—下志留统龙马溪组一段海相页岩中斑脱岩的发育特征及其与页岩储层品质之间的关系进行了研究。研究表明,本地区上奥陶统五峰组—下志留统龙马溪组一段共发育42层斑脱岩层,结合斑脱岩层单层厚度和层间厚度,将其划分为密集发育段、较发育段和欠发育段3个阶段。通过对比不同发育段页岩储层品质特征发现,较发育段具有高脆性矿物、高有机碳含量和高含气性的特征,为最有利页岩储层发育段。此外,从古海洋氧化还原环境和古生产力2个方面阐述了间发性火山活动是导致沉积期氧化还原环境变化的主要原因,且适度的火山活动有利于有机质和生物成因硅质矿物的富集,促进了优质页岩的形成。
[Abstract]:Based on the fine description of the core, with the help of X-ray diffraction analysis of whole rock / clay, argon ion polishing scanning electron microscope and other testing techniques, the characteristics of porphyry derocking, the development mechanism of shale reservoir quality and the different development mechanism of reservoir quality are discussed. The developmental characteristics of porphyry in marine shale of the first member of the Upper Ordovician Wufeng formation and Lower Silurian Longmaxi formation and its relationship with shale reservoir quality were studied in Fuling area. The study shows that 42 layers of porphyry deformations are developed in the first member of the Wufeng formation and Lower Silurian Longmaxi formation of Upper Ordovician in this area. Combined with the monolayer thickness and the interlayer thickness of the porphyry layer, they are divided into three stages of dense development, relatively developed and underdeveloped. By comparing the characteristics of shale reservoir quality in different developing stages, it is found that the relatively developed stage has the characteristics of high brittle minerals, high organic carbon content and high gas content, which is the most favorable shale reservoir development segment. In addition, from two aspects of the paleoceanic redox environment and paleoproductivity, it is expounded that the main reason for the change of redox environment in the sedimentary period is the intergenic volcanic activity. Moderate volcanic activity is beneficial to the enrichment of organic matter and biogenic siliceous minerals and promotes the formation of high quality shale.
【作者单位】：中国地质大学资源学院;中国地质大学海洋学院;中国石油化工股份有限公司江汉油田分公司勘探开发研究院;
【基金】：国家重大科技专项(2016ZX05060-004) 国家自然科学基金项目(No.41690131、No.41772148、No.41702149)资助
【分类号】：P618.13

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