Aiming to solve the problems of unclear pore structure, unknown fluid storage and seepage pattern, and inaccurate fluid recoverability evaluation under in situ high pressure of thermal storage, a new method based on in situ high pressure nuclear magnetic resonance displacement test is proposed for evaluating the seepage capacity and recoverability of geothermal fluid under in situ stress. Based on the study of in situ pore structure and movable water content under different displacement pressures, a new prediction method for the recoverable heat of geothermal reservoir fluids is established. This study finds that significant changes in the pore structure of the samples are observed in the in situ test environment. The pore volumes of macropores and mesopores decrease significantly, while the influence of stress on transition pores and micropores is relatively small. Movable water content increases as a logarithmic function with increase in displacement pressure. Considering in situ stress and fluid mobility, the recoverable heat of geothermal fluids predicted under the new assessment methodology is 27.26% of the static predicted resource. Through the establishment of the above model, accurate prediction of recoverable resources can be realized under different in situ stress.

针对原位高压储热条件下孔隙结构不清晰、流体储量和渗流模式未知以及流体可采性评价不准确等问题，提出了一种基于原位高压核磁共振驱替试验的储热评价新方法。地应力下地热流体的渗流能力和可恢复性。通过对不同驱替压力下原位孔隙结构和可动水含量的研究，建立了地热储层流体可采热预测新方法。本研究发现，在原位测试环境中观察到样品孔隙结构的显着变化。大孔和中孔孔容明显减小，而应力对过渡孔和微孔的影响相对较小。可动水含量随着排替压力的增加呈对数函数增加。综合考虑地应力和流体流动性，新评估方法预测的地热流体可采热量为静态预测资源量的27.26%。通过上述模型的建立，可以实现不同地应力下可采资源量的准确预测。