烃源岩的电化学性质及其测井评价意义

Electro-chemical Property of Source Rock and Its Significance in Log Evaluation

通过实验资料统计分析了烃源岩的电化学性质、岩石物理性质及有机质三者之间的关系。研究表明 ,烃源岩的阳离子交换量CEC与电动电位 ξ之间有正相关关系 ;CEC与自然放射性强度及自然放射性元素丰度之间有正相关关系 ;CEC与有机质丰度指标阳离子交换量与孔隙度之间存在正相关关系 ;阳离子交换量与有机质丰度指标之间有正相关关系 ,与有机质转化率指标之间存在负相关关系 ;电动电位与有机质丰度指标之间有正相关关系 ,与有机质转化率指标之间存在负相关关系。研究烃源岩的电化学性质、岩石物性及与有机质之间的关系 ,对于建立烃源岩的导电模型 ,进而利用测井资料评价烃源岩 ,具有重要的基础研究价值。

This paper uses experimental data to analyse relations among electro-chemical properties, rock physical properties and organic matter in source rock by statistics. It has been shown that there are normal correlations between cation exchange capacity (CEC) and electro-kinetic potential(ξ) of source rock; between CEC and intensity of natural radioactivity, richness of radioactivity elements in source rock; between CEC and richness indicator of source rock; but negative correlation between CEC and translating rate indicator of organic matter of source rock. Also, there exist normal correlation between ξ and richness indicator of source rock; but negative corrlation between ξ and translating rate indicator of organic matter of source rock. This study is of importance in buliding up conductivity model of the source rock and in evaluating source rock by using logging data.