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通过分析岩盐应力-溶解耦合效应对盐腔水溶建腔过程的影响,研究应力-溶解耦合作用下的盐腔水溶建腔机制。研究表明,在盐腔成腔过程中,应力-溶解耦合效应对盐腔形状的影响不可忽略;应力-溶解耦合作用下的盐腔水溶建腔机制在于溶蚀作用下在水的溶蚀影响范围内的腔壁围岩力学性质发生变化,同时,由于腔壁边界处围岩力学性质的改变,造成盐腔内部溶蚀过程发生变化,从而使盐腔形态发生改变;根据应力-溶解耦合作用下的盐腔水溶建腔机制,建立应力-溶解耦合作用下的盐腔水溶建腔计算方法;使用编制的应力-溶解耦合作用下的盐腔形态变化计算程序以及FLAC计算软件对水溶建腔过程进行计算。计算结果表明,相比于纯溶解作用,应力-溶解耦合作用下计算得到的盐腔形状与实际溶腔形状较为符合。该研究成果可为进一步研究储库盐腔水溶建腔机制提供理论依据和分析基础。
By analyzing the effect of rock salt stress-solution coupling effect on water-soluble cavity-forming process of salt cavity, the mechanism of water-soluble cavity in salt cavity under stress-dissolution coupling was studied. The results show that the effect of stress-dissolution coupling on the shape of the salt cavity can not be ignored during the cavitation of the salt cavity. The water-soluble cavity mechanism of the salt cavity under the stress-dissolution coupling is due to the effect of dissolution- Due to the mechanical properties of the surrounding rock at the boundary of the cavity wall, the dissolution process of the salt cavity changes, so that the salt cavity morphology changes. According to the stress-dissolution coupling effect of the salt cavity The mechanism of water-soluble cavity-building was established, and the calculation method of salt-cavity water-soluble cavity under the action of stress-dissolution coupling was established. The salt cavity morphological change calculation program and FLAC calculation software were used to calculate the water-soluble cavity-building process. The calculated results show that the shape of the salt cavity calculated by the stress-dissolution coupling is in good agreement with the shape of the actual cavity compared with pure dissolution. The results of this study can provide theoretical basis and analysis basis for further research on water-soluble cavities in reservoir.