孔隙度分布趋势曲线确定歧北深层气孔隙度下限方法研究

On Method to Determine Porosity Lower Limit in Northern Qikou Sag Deep Gas Using Porosity Distribution Trend Curves

在深层岩心资料有限和测井资料标准化的前提下,基于同一沉积体系内相同沉积微相储层孔隙结构基本相同和不同沉积微相储层孔隙结构相近的规律,通过对歧口凹陷深层气层孔隙度分布趋势和内部结构的研究,找到了一种既方便又简单的孔隙度下限值求取方法,应用孔隙度分布趋势曲线和孔隙度累计贡献曲线可以较准确地确定深层气储层孔隙度下限值。介绍了该方法的理论基础、参数求取、准确性及效果检验。应用该方法获得了较好的评价效果。

Under the circumstance of the limited deep core data and log data standardization and based on the law that the same sedimentary microfacies or different sedimentary microfacies have similar pore structures in the same depositional system, we found a convenient and simple new method to accurately determine the lower limit of deep gas reservoir porosity by the porosity distribution curves and cumulative contribution porosity curves through studying the porosity distribution trends and internal structure of the deep gas in the Qikou sag. This paper introduces the method＇s theoretical basis, parameters calculation, accuracy and effect test. A better evaluation result is obtined.