Impacts of Pore-Throat System on Fractal Characterization of Tight Sandstones
Impacts of Pore-Throat System on Fractal Characterization of Tight Sandstones
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DOI：
10.1155/2020/4941501
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发表时间：
2020-06-18
期刊：
影响因子：
1.7
通讯作者：
Yang, Chao
中科院分区：
文献类型：
--
作者：
Liu, Dengke;Gu, Zhaolin;Yang, Chao
孔喉结构在致密砂岩物性评价中起着主导作用，但相关参数的确定及其对储集层质量的影响仍然难以确定。为此，我们分析了指示孔喉系统的实验数据，然后研究了孔喉结构的分维对岩石学和物性的影响，最后将光学观测、分形理论和预测模型结合起来，探索致密砂岩中各种储集层类型的性质。结果表明，压汞曲线的分维对应于三种孔喉类型，压汞曲线的分维对应于两种孔喉类型。识别出5种储集层类型，其中最好的储集层类型具有较高比例的粒间孔和溶蚀孔，而粘土相关孔所占比例较低，不同类型的孔喉连通性差异对储集能力有显著影响。通过综合实验数据，建立了不同类型油藏的储集能力预测模型。这项工作采用了基于毛管压力曲线的综合分形理论，有助于探索致密砂岩中孔喉系统对储集层质量的影响。
The pore-throat structures play a dominant role in the evaluation of properties of tight sandstone, but it remains difficult to determine the related parameters and understand their impact on reservoir quality. Hence, toward this end, we analyze the experimental data that are indicative of the pore-throat system, then we investigate the effect of fractal dimensions of pore-throat structures on petrologic and physical properties, and finally, the optical observations, fractal theory, and prediction model were integrated to explore the qualities of various reservoir types in tight sandstones. The results show that the fractal dimensions of the mercury intrusion curve correspond to three pore-throat types and those of the mercury extrusion curve could correspond to two pore-throat types. Five types of reservoirs were identified, the best reservoir type has a high percentage of interparticle and dissolution pores but a low proportion of clay-related pores, and the differences in pore-throat connectivity of various types affect storage capacity significantly. The storage ability prediction models of various reservoir types are raised by integrated experimental data. This work employed a comprehensive fractal theory based on capillary pressure curves and helps to explore how pore-throat systems influence reservoir quality in tight sandstones.