| 碎屑颗粒含量与泥页岩孔隙分布关系的概念模型--以黔西北志留系龙马溪组为例 |
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| 引用本文： | 禚喜准,闫清涣,张姣姣,张林炎,陈骁帅,马立成.碎屑颗粒含量与泥页岩孔隙分布关系的概念模型--以黔西北志留系龙马溪组为例[J].沉积学报,2018,36(5):969-980. |
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| 作者姓名： | 禚喜准 闫清涣 张姣姣 张林炎 陈骁帅 马立成 |
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| 作者单位： | 1.辽宁工程技术大学地质系, 辽宁阜新 123000; |
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| 基金项目： | 国家自然科学基金项目（41402101）;辽宁省教育厅一般项目（14-1167） |
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| 摘 要： | 岩石的组分、结构和颗粒排列,决定了孔隙的发育特征,但从结构-成因角度探讨碎屑颗粒含量及其排列样式对泥页岩孔隙分布影响的研究较少。以黔西北志留系龙马溪组黑色泥页岩为例,基于薄片分析、XRD分析和扫描电镜等分析结果,根据碎屑颗粒排列方式,将泥页岩分为“颗粒分散状”和“纹层状”两种类型,提出泥页岩孔隙结构的概念模型,由此分析碎屑颗粒含量对孔隙发育的影响。对于“颗粒分散状”泥页岩来讲,碎屑颗粒含量低于52.4%时,主要发育黏土矿物微孔隙,孔隙度随颗粒含量的增加而减小;当碎屑颗粒含量达到52.4%时,颗粒间全部为黏土矿物充填,孔隙度最低;当碎屑颗粒含量继续增加时,粒间孔隙大量出现,孔隙度也将迅速增大。对于“纹层状”泥页岩,颗粒含量的增加会导致砂质纹层内的粒间孔隙不断增多,孔隙度也随之增大,逐渐向常规的碎屑岩储层转变。本模型有助于加深对泥页岩、致密砂岩和常规砂岩孔隙发育机理的理解,对非常规储层的预测评价也有重要启示。
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| 关 键 词： | 颗粒分散状泥页岩 纹层状泥页岩 微孔隙 粒间孔隙 孔隙度 |
| 收稿时间： | 2017-11-15 |
Conceptual Models for Correlation between Detrital Particles Contents and Pore Distribution of Shale: Taking the Silurian Longmaxi Formation in northwestern Guizhou as an example |
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| Institution: | 1.Department of Geology, Liaoning Technical University, Fuxin, Liaoning 123000, China;2.Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China |
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| Abstract: | The composition, structure and particles arrangement of rocks determine the developmental characteristics of pores. However, there are few researches performed on the influence of detrital particles content and its arrangement patterns on the pore distribution of shale from the structural-genetic perspectives by far. The black shale of the Silurian Longmaxi Formation in northwestern Guizhou Province was taken as an example for the analysis of thin section, XRD and scanning electron microscopy (SEM), and two types of shales were divided as the "particle dispersal" and "lamellar" according to the arrangement patterns of detritus particles. The conceptual models of pore structure of shales were abstracted and the influence of detrital particles content on the pore development was analyzed. For the particle dispersed shale, the main type of pore is micro pores of clay minerals while the content of clastic particles is less than 52.4%, and the porosity decreases with increase of particles content. When the content of clastic particles reaches 52.4%, the porosity becomes the lowest and the interpartical pores are filled with clay. The interpartical pores will increase with the clastic particles content increasing, and the porosity will increase rapidly. For the laminar shale, the increase of grain content leads to the increase of intergranular pores and the increase of porosity in sand strip, and then result in the transformation of shale reservoir to conventional clastic reservoir gradually. These models can be helpful for a deepen understanding of the development mechanism of porosity in shale, tight sandstone and conventional sandstone, and also important implications to predict and evaluate unconventional reservoirs. |
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