尼日尔三角洲里奥-德雷盆地泥底辟变形与形成演化特征

doi:10.11743/ogg20210617

Abstract

Abstract:

Several mud diapir belts developed in the Akata Formation mudstone are closely linked to the accumulation of hydrocarbon in the Rio Del Rey Basin, northeast Niger delta. According to their heights and contact relationships to peripheral strata, the mud diapirs can be divided into complicated pierced and simple buried styles, with S-N trending elongations or scattering dots in a plane view. Influenced by mud diapirs, three kinds of normal faults have developed in the overburden. The evolution of mud diapirs experienced three stages: the deposition and weak activity stage before the middle Oligocene, intense rising stage during the late Oligocene and Miocene, and weak activity and buried stage after the Miocene. In addition to the influence exerted by gravitational sliding and differential loading induced from the overburden, the formation of mud diapirs are also subjected to some Atlantic transform faults in the southeast part of the Rio Del Rey Basin and basement faulting activities. The study is helpful to the analysis of the impact of these diapirs upon the development of traps and reservoirs as well as hydrocarbon migration in the basin.

Key words: Akata Formation, mud diaper, fault, Rio Del Rey Basin, Niger Delta

CLC Number:

TE122.2

Yixin Yu, Tao Wang, Zhankun Chen, Yushan Su, Jixin Zhang, Shixiang Wu. Deformation and evolution of mud diapirs in Rio Del Rey Basin, Niger Delta[J]. Oil & Gas Geology, 2021, 42(6): 1435-1439, 1474.

Figures/Tables 6

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Table 1

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References 22

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构造带编号	隆升高度/km	分布面积/km²	展布形态	展布方向
①	3.2	4.7	圆点状	—
②	3.4	9.3	圆点状	—
③	3.3	8.5	圆点状	—
④	4.1	75.0	条带状	NS
⑤	3.4	31.2	条带状	NS
⑥	3.9	43.6	条带状	NS
⑦	3.2	16.8	条带状	NNE-SSW
⑧	3.3	12.0	条带状	NNE-SSW

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Deformation and evolution of mud diapirs in Rio Del Rey Basin, Niger Delta

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