【摘要】 笔者对湖北宜昌寒武系、奥陶系和鄂尔多斯布１井寒武系、任３井奥陶系的大量样品测试和研究结果表明大气淡水成岩环境中的δ１８Ｏ、δ１３Ｃ值均向较高负值漂移；正常和咸化海水成岩环境中δ１８Ｏ、δ１３Ｃ值均向高正值漂移；较深埋藏成岩δ１８Ｏ值向高负值漂移．且与埋深成反比，而δ１３Ｃ值相对较稳定或向低正值漂移。更多还原

【Abstract】 It is a method which needs to be improved using the component of oxygen and carbon isotope to study and judge the diagenetic environment and the intensity of diagenesis. However, many lab data of samples and the analyzing results of Cambrian and Ordovician in Yichang area, Hu Bei Province;the NO. 3 Ren Well and the NO. 1 Bu Well in Ordos area proved that this method iS very effective and practical.The research result indicates that the δ18O and δ13C values shift towards the higher negative values in meteoric diagenetic environment. The δ18O and δ13C values shift towards obviously higher posititve values in marine diagenetic environment. The Z value which was calculated using δ18O and δ13C are all more than 122. In buried diagenetic environment, especislly deeply buried environment, the δ18O value shift towards relatively higher negative values. The more the depth, the lower the δ18O value. However, the δ13C value has not changed obviously in the process of burial.All the conclusion above are consist6nt with the achievement of foreign countries.There are many factors influencing the values of oxygen and carbon isotopes, and the procedures of the buried disgeneds are very complex. So the method metioned above is not absolute. It must be connected with the other research work of petrology and many lab methods.更多还原