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.

• 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。