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通过对牙形石室内加热试验和对野外不同地区牙形石颜色的观察,建立了牙形石色变指标(CAI值)的标准系列。通过对同一岩样进行Ro％的测定及牙形石颜色观察,得出CAI值与镜煤反射率(Ro％)的规律性关系,证明CAI值作为有机质成熟度的指标之一是可行的。在此基础上对湖北二、三迭系牙形石颜色观察鉴定,发现牙形石颜色分布有明显的分区性。湖北二、三迭系在天门、沉湖等地有机质成熟度属成熟—高成熟区,含油气远景较好,利川建南及川东地区属过成熟区含气远景较好。
The standard series of conodont discoloration index (CAI value) were established by heating the conodont chamber and observing the color of conodont in different areas in the wild. Through the determination of Ro% and the conodont color observation of the same rock sample, the regularity relationship between CAI value and specular reflectivity (Ro%) is obtained, and it is feasible to prove that CAI value is one of the indexes of organic matter maturity. On the basis of this, we observed and identified the color of conodont in Hubei Province and Tri-Diego, and found that the color distribution of conodont has obvious zonation. The second and third tributaries of Hubei Province have maturity-high maturity zones in Tianmen and Shenhu, which have good oil-gas prospect. The long-term gas-bearing potential of the mature zones in Jianchuannan and East Sichuan is better.