多旋回盆地复杂生烃史条件下烃源岩生烃量研究

STUDY ON THE HYDROCARBON-GENERATION AMOUNT UNDER THE COMPLEX GEOLOGICAL HISTORY IN THE POLY-CYCLIC BASIN

通过热模拟实验的方法,探讨了复杂生烃史条件下烃源岩生烃量的变化特征。热模拟实验结果表明,复杂生烃史条件下,烃源岩的生烃量与简单连续生烃相比并不相同。烃源岩两次不连续累计生烃量大于连续生烃量;不同的两次不连续生烃中,烃源岩累计生烃量也不相同。对热模拟实验结果的讨论认为,不连续生烃量与连续生烃量的差别主要反映了生烃过程、排烃条件以及可能存在的外界环境的影响。多旋回盆地中的古老烃源岩,在漫长而复杂的生烃过程中,其生烃量与简单的连续生烃相比可能存在显著差异。

The hydrocarbon-generation amounts under the complex geological history in poly-cyclic basin were discussed through several sets of thermal simulation experiments. According to the results of experiments, the hydrocarbon-generation amounts in the continuous generation history is greatly different from the one in the discontinuous histories. When hydrocarbon generation reaction completing, the accumulative hydrocarbon amounts generated in the histories with two discontinuous hydrocarbon generation courses are always more than the hydrocarbon amount generated in the continuous generation history. Moreover, the hydrocarbon-generation amounts are various in different discontinuous generation histories. Based on the discussion about the results of thermal simulation experiments, the differences in the hydrocarbon-generation amount was thought resulting from the different hydrocarbon generation courses, discharging efficiencies and surrounding conditions. It can be deduced that the generated hydrocarbon amount for the old source rocks during the complex and long geological history in the poly-cyclic basin should be different from the hydrocarbon amount for the source rock during the simple continuous generation history in the singular-cyclic basin.