烃源岩非均质性对生烃和排烃定量计算的影响

Quantitative calculation of hydrocarbon-generation and hydrocarbon-expulsion amounts in consideration of source rock heterogeneity

对烃源岩宏观非均质性的级别进行了划分,重点考察了韵律层这一级别烃源岩非均质性的特点。对以往利用体积法计算生烃量及利用“压实—排液”模型计算排烃量的方法进行了分析,考虑到烃源岩非均质性,特别是韵律层非均质性的特点,提出了计算非均质性烃源岩生烃量及在不同排烃模型下的排烃量的新方法。以牛38井中的一段烃源岩为例,详细介绍了新方法的计算流程。与以往的方法进行比较表明,新方法计算精度较高。

The macro-scale heterogeneity of source rock was classified. The heterogeneity of rhythmic deposits was investigated carefully. The disadvantages of calculation of hydrocarbon-generation amount by using the volume model and calculation of hydrocarbon-expulsion amount by using the compaction and expansion model were analyzed. The new methods for calculating hydrocarbon-generation amount and hydrocarbon-expulsion amount with different hydrocarbon-expulsion models in consideration of the heterogeneity of source rock, especially that of rhythmic deposits are put forward. The hydrocarbon-expulsion amount in an interval of source rock in Niu-38 Well was calculated with the new method. The calculation procedure of the new method was introduced in detail. The calculating precision of the new method is higher than that of the former method.