古生物有机质演化热动力学定量计算刍议

A Preliminary Discussion on Quantitative Calculation of the Thermal Dynamics of Organic Matter Evolution in Paleontology

以煤变质热动力学方程为蓝本,修正建立了有机质演化热动力学方程。该方程以无争议的镜质体反射率和岩层绝对年龄为自变量,求解古地温。并以一口包含中生界和古近系之间的不整合面探井实测数据进行验证。实测数据中的最高古地温被定为参考温度。结果表明:对于古近系构造层15个测点,得到的计算温度与参考温度的平均相对误差为0.71%;对于古生界构造层14个测点,得到的计算温度与参考温度的平均相对误差为0.31%。计算结果与实测数据分别用镜质体反射率–时间–古地温三维曲面和立体点来表示。

The thermal dynamic equation of organic matter evolution is modified based on the thermal dynamic equation of coal metamorphism. The equation takes the undisputed Vitrinite reflectance and Geologic age as independent variables to calculate the paleotemperature. And a measured data of the unconformity surface exploration well between the Paleozoic erathem and Paleogene system for verification. The highest paleotemperature in the measured data is considered as the reference temperature. The results show that for 15 measurement points of the Paleogene system, the calculated temperature mean relative error against the reference temperature is 0.71%. For the 14 measurement points of the Paleozoic erathem, the calculated temperature mean relative error against the reference temperature is 0.31%. The calculated results and measured data are represented by the three-dimensional surface and solid point of vitrinite reflectance time paleotemperature, respectively.