关于马南地区不同类型糯米糍力学性能比较的实验研究

Shuiqing Hu, Zirui Yang, Yiqun Yan, Yiping Ye, Wei Zhang, Zhongchen Ba, Hui He, Daobing Wang
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摘要

本研究深入探讨了新疆油田马南地区糯棱岩储层中各种岩石类型的力学性质。它通过探索不同类型糯米质岩的力学变形和破坏模式,填补了知识空白。该研究采用孔隙度-渗透率测试、超声波速度测量和三轴压缩试验,仔细研究了白云质砂岩、钙质粗砂岩、钙质细粉砂岩和面筋岩的物理参数、力学性质、变形和破坏模式。研究结果表明,从白云质砂岩到谷朊岩,孔隙率不断增加,其中钙质粗砂岩的渗透率最低,谷朊岩的渗透率最高。与钙质细粉砂岩相比,白云质砂岩和钙质粗砂岩的剪切波速度更大,而白云质砂岩的纵波速度则高于谷朊岩。变形行为各不相同:白云质砂岩主要具有弹性,而钙质砂岩和谷朊岩则表现出弹塑性特征。白云质砂岩具有最高的抗压强度、弹性模量和泊松比。钙质细粉砂岩的抗压强度和弹性模量低于白云质砂岩,而钙质粗砂岩的泊松比是白云质砂岩的四分之三。观察到的主要破坏模式是白云质砂岩、钙质粗砂岩和糯米质砂岩的剪切破坏,以及钙质细粉砂岩的轴向劈裂破坏。环境扫描电子显微镜和矿物成分等显微分析揭示了岩石之间的力学差异。总之,这项研究为了解糯米质储层岩石的力学特征提供了重要依据,对优化此类储层的水力压裂策略至关重要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Experimental study on the comparison of mechanical properties of different types of glutenite in the Ma'nan area
This study delves into the mechanical properties of various rock types found in glutenite reservoirs in the Ma'nan area of the Xinjiang oilfield. It bridges a knowledge gap by exploring the mechanical deformation and failure patterns among different glutenite types. Employing porosity-permeability tests, ultrasonic wave velocity measurements, and triaxial compression tests, this research scrutinizes physical parameters, mechanical properties, deformation, and failure modes of dolomitic sandstone, calcareous coarse sandstone, calcareous fine siltstone, and glutenite. Results highlight a porosity increase from dolomitic sandstone to glutenite, with calcareous coarse sandstone having the lowest permeability and glutenite the highest. Shear wave velocity is greater in dolomitic sandstone and calcareous coarse sandstone compared to calcareous fine siltstone, while longitudinal wave velocity is higher in dolomitic sandstone than in glutenite. Deformation behavior varies: dolomitic sandstone is primarily elastic, and calcareous sandstone and glutenite show elastoplastic characteristics. Dolomitic sandstone boasts the highest compressive strength, elastic modulus, and Poisson's ratio. Calcareous fine siltstone's compressive strength and elastic modulus fall below dolomitic sandstone, while the Poisson's ratio of calcareous coarse sandstone is three-quarters that of dolomitic sandstone. Main failure modes observed are shear failure in dolomitic sandstone, calcareous coarse sandstone, and glutenite, and axial splitting failure in calcareous fine siltstone. Microscopic analyses, including environmental scanning electron microscopy and mineral composition, shed light on the mechanical differences among the rocks. In sum, this research yields crucial insights into the mechanical traits of glutenite reservoir rocks, essential for optimizing hydraulic fracturing strategies in such reservoirs.
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