Understanding pore structure would enable us to obtain a deeper insight into the fluid mechanism in porous media. In this research, multifractal analysis by various experiments is employed to analyze the pore structure and heterogeneity characterization in the source rock in Ordos Basin, China. For this purpose, imaging apparatus, intrusion tests, and nonintrusion methods have been used. The results show that the objective shale reservoir contains complex pore network, and minor pores dominant the pore system. Both intrusion and nonintrusion methods detected pore size distributions show multifractal nature, while the former one demonstrates more heterogeneous features. The pore size distributions acquired by low temperature adsorption and nuclear magnetic resonance have relatively good consistence, indicating that similar pore network detection method may share the same mechanism, and the full-ranged pore size distributions need to be acquired by multitechniques. Chlorite has an obvious impact on the heterogeneity of pore structure in narrow pore size range, while illite and I/S mixed layer influence that in wide range. Kerogen index is the fundamental indicators of geochemical parameters. With the decrease of averaged small and middle/large pore radius, the heterogeneity of pore structures increase in narrow and wide ranges, respectively. This work employed a comprehensive methodology based on multitechniques and helps to explore how pore networks affect reservoir quality in shale reservoirs.

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多技术组合和多重分形分析表征页岩孔隙结构及其意义

了解孔隙结构将使我们能够更深入地了解多孔介质中的流体机制。本研究通过多种实验的多重分形分析，对鄂尔多斯盆地烃源岩孔隙结构和非均质性特征进行了分析。为此，使用了成像设备、入侵测试和非入侵方法。结果表明，目标页岩储层孔隙网络复杂，孔隙系统以小孔隙为主。侵入和非侵入方法检测到的孔径分布都表现出多重分形性质，而前一种方法表现出更多的异质特征。低温吸附和核磁共振得到的孔径分布具有较好的一致性，表明相似的孔隙网络检测方法可能具有相同的机理，需要通过多种技术获得全方位的孔径分布。绿泥石在较窄的孔径范围内对孔隙结构的非均质性有明显影响，而伊利石和I/S混合层在较宽的范围内影响。干酪根指数是地球化学参数的基本指标。随着平均小、中/大孔隙半径的减小，孔隙结构的非均质性分别在窄和宽范围内增加。这项工作采用了基于多种技术的综合方法，有助于探索孔隙网络如何影响页岩储层的储层质量。绿泥石在较窄的孔径范围内对孔隙结构的非均质性有明显影响，而伊利石和I/S混合层在较宽的范围内影响。干酪根指数是地球化学参数的基本指标。随着平均小、中/大孔隙半径的减小，孔隙结构的非均质性分别在窄范围和宽范围内增加。这项工作采用了基于多种技术的综合方法，有助于探索孔隙网络如何影响页岩储层的储层质量。绿泥石在较窄的孔径范围内对孔隙结构的非均质性有明显影响，而伊利石和I/S混合层在较宽的范围内影响。干酪根指数是地球化学参数的基本指标。随着平均小、中/大孔隙半径的减小，孔隙结构的非均质性分别在窄和宽范围内增加。这项工作采用了基于多种技术的综合方法，有助于探索孔隙网络如何影响页岩储层的储层质量。孔隙结构的异质性分别在窄范围和宽范围内增加。这项工作采用了基于多种技术的综合方法，有助于探索孔隙网络如何影响页岩储层的储层质量。孔隙结构的异质性分别在窄范围和宽范围内增加。这项工作采用了基于多种技术的综合方法，有助于探索孔隙网络如何影响页岩储层的储层质量。