泥质砂岩薄膜电位与含油性的关系及其在测井中的应用

根据含油岩石的薄膜电位实验测量,研究薄膜电位与储层含油性、泥质含量的关系,并用以指导泥浆电阻率的设计.结果表明,含油饱和度对泥质砂岩薄膜电位有较大影响,它的影响可归结为等效阳离子交换容量的变化.在此基础上,通过泥浆电阻率的合理选取,可以增强自然电位测井资料对泥质砂岩储层含油性的定性识别能力.实际应用中取得了显著效果.

The Relationship Between Membrane Potential and Hydrocarbon Saturation of the Shaly Sands and Its Application in Well Logging

The membrane potential of oil-bearing shaly sand is the key to evaluate reservoir with the spontaneous potential log.On the basis of the membrane potential experiments on the oil-bearing shaly sand,the relationship between membrane potential and hydrocarbon saturation & shaly content of the shaly sands was studied to guide the design of resistivity of mud. The results show that the influence of oil saturation on the membrane potential of shaly sand is not negligible.The attribute of oil saturation to membrane is equivalent to the cation exchange capacity of shaly sand.Accordingly,the optimal resistivity of mud was selected to enhance the identification of SP to hydrocarbon bearing characteristics of reservoirs.And the actual application proves this method is better.