断陷盆地烃源岩压实排烃的非均一性分析——以东营凹陷为例

<title>terogeneity analysis of compaction and hydrocarbon expulsion from source rocks in faulted basin-taking Dongying sag as an example.

东营凹陷古近系烃源岩压实排烃有着较强的非均一性,有机质的非均质性分布为其提供了物质基础,压实的非均一性为其创造了动力条件。排烃的非均一性在形式上具微观和宏观两个层次结构,其微观上表现为不同岩性组合的烃源岩以及单层烃源岩内部排烃的明显不同,宏观上表现为不同地区不同层段烃源岩的压实程度以及排烃特征的显著差异。厚层烃源岩内部"滞排"现象及超压体系中间歇性的"幕式排烃"是烃源岩排烃非均一性向两极发展的极端状态。在进行盆地模拟、资源评价时,应充分考虑排烃的非均一性。

<abstract>e compaction and hydrocarbon expulsion from the source rocks of the Paleogene in Dongying sag has stronger heterogeneity. The anisotropy of the distribution of organic matter provides its substance foundation and the heterogeneity of compaction creates the dynamical conditions for it. Heterogeneity of hydrocarbon expulsion has microscopic and macroscopic forms. The micro-heterogeneity behaves as the obvious difference between hydrocarbon expulsion from the source rocks of various lithology combinations and hydrocarbon expulsion inside the single-layer source rocks, and the macro-heterogeneity represents as the obvious discrepancy of compaction degree and expulsion characteristics in the different member and different regions. The stagnant expulsion inside thick source rocks and episodic expulsion in overpressured system are in an extreme state developing towards two poles of the heterogeneity of hydrocarbon expulsion. In the course of basin simulation and resource evaluation, the heterogeneity of hydrocarbon expulsion should be considered fully.