白云凹陷浅成岩浆侵入体发育特征、成因及油气地质意义

望畅; 孙启良; 解习农; 宋慧兰

doi:10.3799/dqkx.2021.053

Volume 47 Issue 2

Feb. 2022

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Wang Chang, Sun Qiliang, Xie Xinong, Song Huilan, 2022. Characteristics and Mechanisms of Shallow Igneous Intrusions and Their Implications on Hydrocarbon Geology in the Baiyun Sag. Earth Science, 47(2): 505-517. doi: 10.3799/dqkx.2021.053

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Wang Chang, Sun Qiliang, Xie Xinong, Song Huilan, 2022. Characteristics and Mechanisms of Shallow Igneous Intrusions and Their Implications on Hydrocarbon Geology in the Baiyun Sag. Earth Science, 47(2): 505-517. doi: 10.3799/dqkx.2021.053

Citation:

Wang Chang, Sun Qiliang, Xie Xinong, Song Huilan, 2022. Characteristics and Mechanisms of Shallow Igneous Intrusions and Their Implications on Hydrocarbon Geology in the Baiyun Sag. Earth Science, 47(2): 505-517. doi: 10.3799/dqkx.2021.053

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Characteristics and Mechanisms of Shallow Igneous Intrusions and Their Implications on Hydrocarbon Geology in the Baiyun Sag

doi: 10.3799/dqkx.2021.053

Wang Chang^{1
,
,},
Sun Qiliang^{1, 2
,
,
,},
Xie Xinong¹,
Song Huilan³

1.
Hubei Key Laboratory of Marine Geological Resources, China University of Geosciences, Wuhan 430074, China
2.
Department of Earth Sciences, University of Oxford, Oxford OX1 3AN
3.
Exploration and Development Research Institute of Huabei Oilfield, CNPC, Renqiu 062552, China

Received Date: 2021-01-09
Publish Date: 2022-02-25

Abstract

Abstract

A large number of Early Miocene (ca. 15.5Ma) shallow igneous intrusions(intrusion depths < 3 000 m) have been identified in the Baiyun Sag of Pearl River Mouth Basin. Their morphological characteristics, relationships and forced folds above them have not been systematically studied. This paper detailedly describes the shapes, vertical migration pathways and spatial relationships (sill complexes) of igneous intrusions, using high-resolution 3D seismic data. Moreover, the geomorphological relationship between the forced folds and the intrusions are quantitatively analyzed. The igneous intrusions are characterized by saucer, strata-concordant, tongue orlentoid shapes. The source and flow direction of magma could be indicated from the geomorphological characteristics and spatial relationship of sills. Magma emplacement is transported from adjacent sills(lateral supply) or from dykes(vertical supply).The geomorphological characteristics of igneous intrusion are mainly controlled by the viscosity of magma, the cohesion of host rock and the emplacement depth of magma. Moreover, some igneous intrusions could trigger sediment deformations of overlying strata and form forced folds. The amplitudes of forced folds are usually less than the thickness of the igneous intrusion, because of the plastic deformation. These folds could serve as hydrocarbon traps whose sizes are mainly influenced by the scale and thickness of underlying igneous intrusion. Furthermore, normal faults that are located within the folded strata and generated by differential compaction provide pathways for vertical hydrocarbon migration.
- Igneous intrusion,
- Igneous feeding relationship,
- Sill,
- Forced fold,
- Baiyun Sag,
- petroleum geology

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Characteristics and Mechanisms of Shallow Igneous Intrusions and Their Implications on Hydrocarbon Geology in the Baiyun Sag

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