碳氧比能谱测井解释的泥质校正

Shale Correction in C/O Spectral Log Interpretation.

申本科．碳氧比能谱测井解释的泥质校正．测井技术，１９９７，２１（３）：２２１～２２６碳氧比测井解释方程中的碳氧比值是在简单岩性的模拟地层中测得的，该值往往忽略了实际泥质砂岩或复杂岩性地层中泥质含量对碳氧比值的影响。通过对岩心样品的中子活化分析，Ｘ射线衍射法测量和定碳仪测量，确定出岩心中泥质砂岩骨架的碳氧比值，从而找到泥质对碳氧比值的影响因素。经校正后的碳氧比值可以准确地求取储层的含油饱和度。

C/O values given by C/O log interpretation equations are obtained from simulated formation with simple lithology, so effects of shale contents in real shaly sands or formation with complex lithology on the values are often ignored. C/O values of shaly sands matrix in core samples have been got from neutron activation analysis of cores, X ray diffraction measurement and carbon content measurement. Thus, the influence factors of shale on C/O value are determined. Accurate oil saturation of reservoir can be determined with the corrected C/O values.