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针对辽河西部凹陷不同岩性、不同干酪根类型18块样品进行了较详细的开放体系生烃动力学研究,模拟结果反映出相同岩性不同有机质类型烃源岩动力学特征存在较大的差异,有机质类型越好,平均活化能越小,主频活化能对应的反应分数越大,活化能分布范围越窄,表明有机质类型对烃源岩生烃动力起着决定性作用.应用平行一级反应模型,结合埋藏史、热史对辽河西部凹陷古近系烃源岩生烃史进行了定量研究,层位上,西部凹陷沙三、沙四段是主力烃源岩,分别占总生烃量的63.9%和18.5%,其次为沙一二段和东营组,4套烃源岩累计生烃量为328.09×108t;东营期是主要的生烃时期.
In the light of the lithology and hydrocarbon generation kinetics of 18 samples with different lithology and different kerogen types in the western Liaohe Sag, the simulation results show that there are great differences in the dynamic characteristics of source rocks of the same lithology and different organic matter types, The better the organic matter type, the lower the average activation energy, the larger the reaction frequency corresponding to the activation energy, and the narrower the distribution range of activation energy, indicating that the organic matter type plays a decisive role in the hydrocarbon generation kinetics of hydrocarbon source rocks.Using the parallel first-order reaction model, Combined with the burial history, the thermal history quantitatively studied the hydrocarbon generation history of the Paleogene source rocks in the western Liaohe Sag. On the horizon, the Es3 and Sha4 Member in the western sag are the main source rocks, accounting for 63.9% And 18.5%, respectively, followed by the first and second member of Shahejie Formation. The total hydrocarbon generation of the four sets of source rocks is 328.09 × 108t. Dongying period is the main hydrocarbon generation period.