济阳坳陷古近系烃源岩结构及排烃的非均一性

The structure of source rocks and characteristics of hydrocarbon expulsion—An example from Paleogene system in Jiyang Depression

济阳坳陷古近系湖相纹层状泥页岩中的有机碳分布非均一性强烈,烃源岩结构有大段纯泥岩式、砂岩嵌入式、指状式、泥岩嵌入式、泥包砂式、砂包泥式和砂泥交互式等,其压实状态、压力分布状态及排烃特征互不相同。烃源岩压实不均衡导致排烃的非均一性,厚层烃源岩中的滞排现象和超压体系的幕式排烃特征是非均一性的两种极端体现。烃源岩排烃的非均一性为分阶段进行排烃模拟提供了新思路。

There are macroscopic and microscopic heterogeneities in the distribution of organic matter in the JiYang Depression and many forms of lithologic structure of the source rocks, showing an inhomogeneity of hydrocarbon expulsion from source rocks. In the formation the state of pressure and characteristics of hydrocarbon expulsion are different from each other. The phenomena of stagnant expulsion and abrupt expulsion suggest that there are two extreme states for hydrocarbon expulsion. The inhomogeneity of hydrocarbon expulsion is guidance for resource evaluation and prediction, which will be able to provide the ways for simulation of hydrocarbon expulsion.