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南海西部海域莺琼盆地为高温高压高含CO_2含油气盆地,在储层测井评价孔隙度计算过程中,由于气、水性质的差异,若用岩心刻度法求取储层孔隙度,会导致计算的孔隙度值不能反映地层的真实情况,对此,提出联合体积物理模型和阿尔奇公式的方法求解含气储层孔隙度。此外,考虑到研究区CO_2的影响,首先将CO_2对流体密度以及地层水电阻率的影响进行了分析,然后确定相应的计算参数。应用表明,该联合求解孔隙度的方法较简洁,且解释结果与经覆压校正后的岩心孔隙度吻合较好,平均误差为5.81%,满足该区储层评价的要求,说明了该方法的可靠性。该方法可为高温高压高含CO_2含气储层测井孔隙度计算提供一种新的选择。
In the west of the South China Sea, the Ying-Qiong Basin is a high-temperature and high-pressure hydrocarbon-bearing basin with high CO 2 content. Due to differences in gas and water properties during reservoir logging evaluation of porosity, if core porosity is used to calculate reservoir porosity, The calculated porosity value can not reflect the real situation of the formation. In this connection, the physical model of the combined volume and the Archie formula are proposed to solve the porosity of the gas-bearing reservoir. In addition, taking into account the influence of CO_2 in the study area, the influence of CO_2 on fluid density and formation water resistivity is analyzed first, and then the corresponding calculation parameters are determined. The application shows that the method for solving the porosity is relatively concise, and the interpretation result is in good agreement with the core porosity corrected by overburden pressure. The average error is 5.81%, which meets the requirement of reservoir evaluation in this area. reliability. The method can provide a new choice for logging porosity calculation of high-temperature and high-pressure gas reservoirs containing CO_2.