SHW地区阜三段砂岩储层变参数岩电研究

摘要

根据SHW地区岩电实验数据，讨论Archie公式中m、n变化对含水饱和度的影响。结果显示，m变化对饱和度影响较大，特别对低孔储层影响更甚，而n变化对饱和度影响远小于m，因此m的选取对饱和度的解释至关重要。鉴于SHW地区受泥质、灰质影响，含油砂岩储层岩性多样、孔隙结构复杂，研究不同岩性砂岩储层的m分布特征，得出相同岩性储层m与孔隙度在双对数坐标下呈线性正相关，而不同岩性砂岩储层的m与孔隙度关系表现出趋势线斜率不同。基于以上认识，建立不同岩性砂岩储层的岩电参数解释模型，实现变参数解释油层含油饱和度，提高解释精度，在实际应用中取得显著效果。%According to data of electric petrophysical experiments in SHW area,it was discussed the effect of porosity exponent,m,and saturation exponent,n,on water saturation in Archie formula.The results indicated that the effect of m on the saturation is bigger,especially in low porosity reservoir.And the effect of n is much less than that of m on the satura-tion.Therefore,the selection of m is essential to the saturation interpretation.In view of the lithologic diversity and complex pore structure of oil-bearing sandstone reservoirs in SHW area affected by shale and calcareous clay,it was studied on the m distribution characteristics for different lithologic sandstone reservoirs.The study results indicated that the m has a linear correlation with the porosity for the same lithologic sandstone reservoir in log-log coordinate,but the trend line slop is dif-ferent for various lithologic sandstone reservoirs.The interpretation models of electric petrophysical parameter were estab-lished based on various lithologic sandstone reservoirs.Thus this can realize oil saturation interpretation by variable param-eters and improve the interpreting accuracy.And the remarkable effects were obtained in the practical application.