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首页> 美国卫生研究院文献>Scientific Reports >Pore structure characterization of Chang-7 tight sandstone using MICP combined with N2GA techniques and its geological control factors
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Pore structure characterization of Chang-7 tight sandstone using MICP combined with N2GA techniques and its geological control factors

机译：MICP结合N2GA技术表征长7致密砂岩孔隙结构及其地质控制因素

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摘要

Understanding the pore networks of unconventional tight reservoirs such as tight sandstones and shales is crucial for extracting oil/gas from such reservoirs. Mercury injection capillary pressure (MICP) and N2 gas adsorption (N2GA) are performed to evaluate pore structure of Chang-7 tight sandstone. Thin section observation, scanning electron microscope, grain size analysis, mineral composition analysis, and porosity measurement are applied to investigate geological control factors of pore structure. Grain size is positively correlated with detrital mineral content and grain size standard deviation while negatively related to clay content. Detrital mineral content and grain size are positively correlated with porosity, pore throat radius and withdrawal efficiency and negatively related to capillary pressure and pore-to-throat size ratio; while interstitial material is negatively correlated with above mentioned factors. Well sorted sediments with high debris usually possess strong compaction resistance to preserve original pores. Although many inter-crystalline pores are produced in clay minerals, this type of pores is not the most important contributor to porosity. Besides this, pore shape determined by N2GA hysteresis loop is consistent with SEM observation on clay inter-crystalline pores while BJH pore volume is positively related with clay content, suggesting N2GA is suitable for describing clay inter-crystalline pores in tight sandstones.
机译：了解非常规致密油藏（例如致密砂岩和页岩）的孔隙网络对于从此类油藏中提取石油/天然气至关重要。进行了汞注入毛细管压力（MICP）和氮气吸附（N2GA）评估Chang-7致密砂岩的孔隙结构。薄层观察，扫描电子显微镜，粒度分析，矿物成分分析和孔隙率测量被用于研究孔隙结构的地质控制因素。粒度与碎屑矿物质含量和粒度标准偏差正相关，而与粘土含量负相关。碎屑矿物质含量和晶粒度与孔隙率，孔喉半径和抽出效率正相关，而与毛细管压力和孔喉尺寸比负相关。而间隙材料与上述因素呈负相关。具有高碎片的分类良好的沉积物通常具有较强的抗压实性，可以保留原始孔隙。尽管粘土矿物中产生了许多晶间孔，但这种类型的孔并不是导致孔隙率最重要的因素。除此之外，由N2GA磁滞回线确定的孔隙形状与对粘土晶间孔的SEM观察一致，而BJH孔体积与粘土含量成正相关，表明N2GA适合描述致密砂岩中的粘土晶间孔。

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