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随着石油勘探工业的持续发展和技术水平的日益提高,低孔低渗油气藏已成为我国油气勘探开发的重要领域之一,但是该类油气藏的储层岩石物理关系复杂,对其评价也相对较难。本文针对中深层气藏低孔低渗储层评价存在的困难,采用修正的White气体包裹体模型开展岩石物理研究。首先对气体包裹体模型进行分析,得到纵横波速度的计算公式,进而理论计算并分析纵横波速度与孔隙度、饱和度、压力及温度参数的变化关系,最后结合岩心实验对理论计算结果进行了验证。研究结果表明基于气体包裹体模型的理论计算结果与实测数据吻合较好,可以较好地为低孔低渗复杂储层声波速度测量及解释提供技术支持。
With the continuous development of the oil exploration industry and the increasing technological level, the low porosity and low permeability reservoirs have become one of the important fields for oil and gas exploration and development in China. However, the rock physics of reservoirs in this type of reservoirs is complex, Relatively difficult. In this paper, aiming at the difficulties in the evaluation of low porosity and low permeability reservoirs in medium and deep gas reservoirs, a modified model of White gas inclusions is used to conduct petrophysical research. Firstly, the model of gas inclusions is analyzed to obtain the formula of P- and S-wave velocities. Then the relationship between P- and S-wave velocities and the porosity, saturation, pressure and temperature parameters are theoretically calculated and analyzed. Finally, the theoretical calculations are carried out with core experiments verification. The results show that the theoretical calculation results based on the gas inclusion model are in good agreement with the measured data, which can provide good technical support for the acoustic velocity measurement and interpretation of complex reservoirs with low porosity and low permeability.