等效弹性模量差比值法在识别低阻油气层中的应用

泌阳凹陷北部斜坡区断层发育,由于受到后期构造作用,地表水渗入使得地下水系复杂,油区内高电阻油层、低电阻油层、高电阻水层并存,造成低电阻油层识别困难。依据岩石弹性力学理论,利用纵波弹性模量差比值法识别孔隙砂岩粒间流体性质,从而达到识别低电阻油层的目的。通过在泌阳凹陷北部斜坡的应用实例证实,该方法与其他方法相结合能较好地识别低电阻油层,提高了测井解释符合率。

Application of difference ratio of equivalent elastic modulus in identifying low resistivity hydrocarbon layers

Northern slope of Biyang depression is a fault - developed area. Because of later tectonism and complicated underground water system caused by surface water filtration, high resistivity oil layers, low resistivity oil layers and high resistivity water layers coexist in the same formation, which makes it difficult to identify low resistivity oil layers. Based on the rock elastic mechanics theory and the method of difference ratio of equivalent elastic modulus, fluid property of intergranular sandstone can be distinguished. In combination with other methods, low resistivity oil layers are identified and the coincidence rate of logging interpretation is greatly enhanced. All these can be exemplified from the case in northern slope of Biyang depression.