莺琼盆地X-X气田束缚水饱和度评价

X-X Gas Field Bound Water Saturation Evaluation in Yingqiong Basin

准确计算束缚水饱和度,结合含水饱和度形成的"双饱和度"法能够更为有效地评价储层是否为纯油气层。此文利用岩心毛管压力实验资料分析束缚水饱和度与孔隙度和烃柱高度的关系,孔隙度一定的情况下随着气柱高度的增大束缚水饱和度呈指数降低;在油气柱高度一定的情况下随着孔隙度的增大束缚水饱和度呈下降趋势。在此研究基础上,X-X气田底水气藏采用J函数平均的方法确定油层束缚水饱和度;对于没有气水界面的气藏可建立核磁束缚水饱和度与孔隙度模型来确定。实际应用表明,此文所应用的研究方法计算束缚水饱和度准确可靠,为莺琼盆地X-X气田储层流体性质识别和定量评价奠定了基础,对其他盆地复杂流体性质的测井评价具有一定的参考意义。

Accurate calculation of the bound water saturation,combined with the"dual saturation"method of water saturation can more effectively evaluate whether the reservoir is a pure oil and gas layer.In this paper,the relationship between the bound water saturation and the porosity with the height of the hydrocarbon column is analyzed by the core capillary pressure experimental data.When the porosity is certain,the bound water saturation is reduced exponentially with the increase of the height of the gas column.When the the height of the oil and gas column is certain,the bound water saturation decreases with the increase of the porosity.On the basis of this study,the bound water saturation of the gas layer in the bottom water gas reservoir is determined by J-function average method.For the gas reservoir without gas water interface,the bound water saturation can be determined by establishing the NMR bound water saturation and porosity model.The practical application shows that the research method applied in this paper is accurate and reliable in calculating the bound water saturation,which lays a foundation for the identification and quantitative evaluation of reservoir fluid properties in X-X gas field of Yingqiong basin.It has certain reference for the logging evaluation of complex fluid properties in other basins.