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首页> 外文期刊>Energy Exploration & Exploitation >Petroleum system and hydrocarbon accumulation characteristics in the wenchang and enping formations in the Huizhou Sag, Pearl River Mouth Basin, China
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Petroleum system and hydrocarbon accumulation characteristics in the wenchang and enping formations in the Huizhou Sag, Pearl River Mouth Basin, China

机译：珠江口盆地惠州凹陷文昌组和恩平组油气系统和油气成藏特征

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摘要

Conventional oil and gas reservoirs are in the Oligocene and later formations in the Huizhou Sag, Pearl River Mouth Basin, South China, and oil & gas were generated by the source rocks in the Eocene Wenchang and Eocene-Oligocene Enping Formations. However, exploration paradigm shift has been made in the Sag with the depletion of conventional reservoirs and recent oil and gas discoveries in the Wenchang and Enping Formations, and Wenchang and Enping become the new targets of exploration. With more detailed researches to evaluate the exploration potential in the two conventional source rock formations, basic factors of the petroleum system are analyzed based on seismic data, well drilling, and lab measurements. We used sequence stratigraphy and statistics to research thickness trend of source rock. Different from discontinuous distribution of lake basin during the Wenchang formation deposition suggested by predecessors, as the major source rock in the Wenchang Formation, SQ2 whose dominant facies are deep lakes and shallow lakes is present widely with thickness varies from 200 meters to 1000 meters, and the thickest source rocks locate in the Huixi, Luxi and Huidong half-grabens. Both the Wenchang and Enping formations contain multiple source rock-reservoir-seal combinations. We conduct a detailed study on the petroleum system in the deeper reservoir-cap combinations in the Huizhou Sag. The study results in the hydrocarbon generation and migration timing. Reservoirs are classified based on the multi-stage structural movements and multi-stage hydrocarbon generations. We address the controlling effect of the structure evolution on hydrocarbon accumulation. Finally, we build a relationship between reservoir quality and structural units in the study area, and helps reduce the risks of the exploration and production in the Huizhou Sag.
机译：常规的油气藏在渐新世，后来在惠州凹陷，珠江口盆地，中国南部形成了地层，而油气则是由始新世文昌和始新世至渐新世恩平地层的烃源岩产生的。但是，随着常规储层的枯竭以及文昌组和恩平组的最新油气发现，凹陷凹陷的勘探范式发生了变化，文昌和恩平成为新的勘探目标。通过更详细的研究来评估两种常规烃源岩层的勘探潜力，基于地震数据，钻井和实验室测量分析了石油系统的基本因素。我们利用层序地层学和统计学方法研究了烃源岩的厚度趋势。与前人提出的文昌组沉积过程中湖盆的不连续分布不同，作为文昌组的主要烃源岩，SQ2的主要相为深湖和浅湖，广泛存在，厚度从200米到1000米不等。最厚的烃源岩分布在惠溪，Lux西和惠东半构造。文昌组和恩平组均包含多种烃源岩-储层-盖层组合。我们对惠州凹陷深层储层盖组合中的石油系统进行了详细研究。该研究得出了油气的生成和运移时间。储层根据多级构造运动和多级烃生成进行分类。我们讨论了结构演化对油气成藏的控制作用。最后，我们在研究区域建立了储层质量与结构单元之间的关系，并有助于降低惠州凹陷的勘探和生产风险。

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