The Types and Implication of Migrated Sequence Stratigraphic Architecture in Continental Lacustrine Rift Basin: An Example from the Paleogene Wenchang Formation of Zhu Ⅰ Depression, Pearl River Mouth Basin
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摘要: 相对于海相盆地层序，陆相盆地层序构型具有多样性特征.迁移型层序是陆相断陷湖盆演化过程中一种特殊的层序构型，研究相对较少.通过珠江口盆地珠Ⅰ坳陷惠州凹陷、恩平凹陷古近系文昌组层序迁移现象的分析，定义了迁移型层序的概念，划分出“自迁移”和“异迁移”两种迁移型层序类型.自迁移型层序是由低角度正断层的水平滑动造成，即由同一条同沉积边界断裂控制；异迁移型层序由盆地两侧同沉积控边断裂活动强度及先后期次造成，即由两条同沉积边界断裂控制.迁移型层序在侧向迁移过程中，不同级次的层序地层单元控制下的储层、烃源岩也发生侧向迁移、斜列叠置，更利于生、储、盖等油气成藏要素的有效配置，形成多区块、多层段油气藏组合.Abstract: Compared with the sequences of marine basins, sequence stratigraphic architecture of non-marine basins is characterized by multi-variation and uncertainty. Migrated sequence stratigraphic architecture is one non-normal type in the evolution of continental lacustrine rift basin, which is rare documented. Based on the sequence stratigraphic units analysis of Paleogene Wenchang Formation of Huizhou and Enping sags, Zhu Ⅰ Depression, Pearl River Mouth Basin, this paper defined the concept of migrated sequence stratigraphic architecture and divided into autogenic and allogenic migration. Autogenic migrated sequences are mainly controlled by horizontal displacement of low-angle syndepositional normal fault, whereas allogenic migrated sequences are controlled by the different tectonic activation episodes of boundary fault on both sides of the basin. In other words, autogenic and allogenic migrated sequences are controlled by one and two syndepositional boundary fault, respectively. During the lateral migration of sequences, reservoirs and source rocks controlled by sequence stratigraphic units at multiple scales also migrate and stack laterally. This helps the high-efficient configuration of hydrocarbon accumulation factors (e.g., source rock, reservoir, and seal) to generate reservoir combination with multiple blocks and multiple strata.
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图 1 珠江口盆地珠Ⅰ坳陷文昌组洼陷划分及构造特征
Fig. 1. Sag units and tectonics of Paleogene Wenchang Formation of Zhu Ⅰ depression, Pearl River Mouth basin
图 2 珠江口盆地珠Ⅰ坳陷古近系文昌组层序地层格架
Fig. 2. Sequence stratigraphic framework of Paleogene Wenchang Formation of Zhu Ⅰ depression, Pearl River Mouth basin
图 3 珠Ⅰ坳陷恩平凹陷EP17洼文昌组自迁移层序构型
剖面位置见图 1
Fig. 3. Typical autogenic migration sequence stratigraphic architecture across EP17 sub-sag of Enping sag, Zhu Ⅰ depression
图 4 恩平凹陷EP17、EP12洼文昌组SQ1~SQ7层序北部沉积边界叠合
Fig. 4. Northern sedimentary boundary overlay distributions of Wenchang sequences SQ1-SQ7 of EP17 and EP12 sub-sags, Enping sag
图 5 恩平凹陷文昌组SQ1~SQ7层序地层恢复剖面
Fig. 5. Balance section restoration of Wenchang sequences SQ1-SQ7 of Enping sag
图 6 珠Ⅰ坳陷惠州凹陷HZ26-XJ24洼文昌组异迁移层序构型
剖面位置见图 1
Fig. 6. Typical allogenic migration sequence stratigraphic architecture across HZ26 and XJ24 sub-sags of Huizhou sag, Zhu Ⅰ depression
图 7 惠州凹陷HZ26洼、XJ24洼文昌组及三级层序SQ1~SQ7厚度平面分布
Fig. 7. Sequence stratigraphic thickness distributions of Wenchang Formation and third-order sequences SQ1-SQ7 of HZ26 and XJ24 sub-sags, Huizhou sag
图 8 惠州凹陷HZ26洼、XJ24洼文昌组SQ1~SQ7层序地层恢复剖面
Fig. 8. Balance section restoration of Wenchang sequences SQ1-SQ7 of HZ26 and XJ24 sub-sags, Huizhou sag
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