Sedimentary microfacies and lithologic trap types of Neogene Hanjiang Formation in Enping Sag
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摘要:
新近系韩江组是珠江口盆地恩平凹陷的油气主要储集层段，随着勘探程度的提高，寻找岩性油气藏是未来油气勘探的重要方向。为了系统地研究该地区岩性圈闭的发育类型，在“沉积层序”理论模型的指导下，划分出高位体系域、海侵体系域及低位体系域，并通过井震结合、岩芯观察，结合RGB属性融合技术增强关键沉积单元的刻画，开展了精细的沉积微相研究，共识别出辫状河道、串沟河道、曲流河道、河口坝、海岸砂脊和远砂坝6种沉积微相类型。在微相砂体刻画的基础上，结合构造特征，总结了该地区发育的构造-岩性圈闭、多砂体类型岩性圈闭以及上倾尖灭型岩性圈闭三大岩性圈闭类型，其中凹陷中部、西南部以河道砂为储层的构造-岩性圈闭为最具勘探潜力的目标类型。
Abstract:Hanjiang Formation of Neogene is the main reservoir section of oil and gas in Enping Sag of Pearl River Mouth Basin. With the improvement of exploration degree, searching for lithologic oil and gas reservoir is an important direction of oil and gas exploration in the future. In order to systematically study the development types of lithologic traps in this area, under the guidance of the theoretical model of "sedimentary sequence", the high-level system tract, transgressive system tract and low-level system tract are divided. The key sedimentary units are enhanced by well-seismic combination, core observation and RGB attribute fusion technology, and the fine sedimentary microfacies are studied. Six sedimentary microfacies are identified: braided channel, gully channel, meandering channel, estuary bar, coastal sand ridge and far sand bar On the basis of microfacies sand body characterization, combined with structural characteristics, three lithologic trap types developed in this area are summarized, i.e., structural-lithologic trap, lithologic trap of multi-sand body type and lithologic trap of upward dip pinchout type. Among them, structural-lithologic trap with channel sand as reservoir in the middle and southwest of sag is the most potential target type for exploration.
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Key words:
- sedimentary microfacies /
- lithologic trap /
- Hanjiang Formation /
- Enping Sag /
- Pearl River Mouth Basin
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