利用地震资料预测烃源岩成熟度—改进的TTI法

PREDICTING THE MATURITY OF SOURCE ROCK USING SEISMIC DATA-IMPROVED TTI METHOD

从化学动力学原理出发，运用阿仑尼乌斯方程改进时间－温度指数（TTI）法，使其适用于不同类型干酪根热解生烃反应速度差别甚大情况，可以在盆地勘探早期，以地震资料为主评价生烃源岩有机质成熟度。TTI值与生烃率（X）关系的建立，可确定一套地层在不同时期生烃率的分布，为资源量计算提供了基础。实例计算结果与地化分析结果一致，表明改进的TTI法是可靠的。

On the basis of chemical kinetic principles, we have improved time-temperature index (TTI) method by using Arrhenius equations, making it applicable to the practical case in which the reaction rate of thermal degradation for different types of kerogens diverge very much. After improvement made, the method can be used to evaluate organic maturity in source rock by mainly using seismic data in early period of basin exploration. Through setting up the relation between TTI values and the percentage of oil generated, we can get the distribution of the percentage of oil generated of a specific stratum in different ages which forms the basis of resource extent calculation. The calculated result of a practical example is consistent with that of geochemical analysis, that suggests that the method is reliable.