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Experimental study on the main factors of mechanical properties of conglomerate
ZHOU Bo
esearch Institute of Experiment and Detection of Xinjiang Oilfield Company
摘要:
随着近些年来中国准噶尔盆地中央玛湖凹陷砂砾岩油藏勘探开发的成功,砂砾岩作为一种新的油气储层,急需研究其力学性质及其影响因素。本文通过对百口泉组砾岩的岩石学特征、非均质性和力学性质的研究,分析了砾岩中砾石的含量与几何特征、砾岩的非均质性的控制因素以及在三轴压缩实验中的力学行为。研究结果表明:砾岩中的砾石尺寸和含量分布差异较大,受砾石含量和粒径的控制,砾岩具有强非均质性。砾岩力学性质分析表明,砾岩具有塑性特征,砾石含量越高、球度越低、非均质性越强,砾岩塑性越强。由于作为非均质体的砾石的存在,使砾岩在应力加载时产生局部应力集中,导致砾石边缘产生大量的微裂缝,这是砾岩具有较强塑性特征的微观机理。本文的研究对于砾岩开发中的岩石力学性质研究和工程性质评估具有借鉴意义。
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Experimental study on the main factors of mechanical properties of conglomerate
ZHOU Bo
esearch Institute of Experiment and Detection of Xinjiang Oilfield Company
Abstract:
1 billion tons of oil reserves have been found in Mahu Depression, Junggar Basin, Xinjiang, China. The reservoirs are sand-conglomerate reservoirs of Baikouquan Formation of Lower Triassic. The gravel developed in reservoir rocks has a great influence on the mechanical properties of rocks. The results of mechanical date are discrete, and the law are difficult to grasp, so it is difficult to study. In this paper, taking the conglomerate of Baikouquan Formation as the research sample, the relationship between the mechanical properties of conglomerate and Its Petrological Characteristics is established by analyzing the petrological characteristics, structural characteristics, rock heterogeneity and mechanical properties of conglomerate through experiments. The results show that gravel is well developed in Mahu reservoir. The higher the gravel content is, the stronger the heterogeneity of rock is. There is a negative correlation between the strength of conglomerate and the separation and sphericity of conglomerate. The conglomerate is characterized by plasticity. The expansion point of conglomerate can appear at 23.65% strength at the earliest, and the post-peak curve is fairly straight. The main controlling factors are gravel content, mean sphericity and heterogeneity coefficient of conglomerate. The higher the gravel content, the lower the sphericity and the stronger the heterogeneity. The more the micro-cracks around the gravel under stress, the larger the plastic zone of the front of the crack propagation, and the stronger the overall plasticity of the gravel. It provides a basis for evaluating the fracturability of conglomerate reservoir before hydraulic fracturing.
Key words:  Conglomerate, petrological  characteristics, heterogeneity, mechanical  properties, plasticity