Origin of polygonal fault systems: A case from the Sanzhao sag in the Songliao Basin, East China

Ding, Xiujian; Liu, Guangdi; Sun, Min; Wang, Pangen

doi:10.1016/s1876-3804(13)60040-3

Cited by 14 publications

(12 citation statements)

References 22 publications

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“…'Syneresis mechanism' indicates the PF formation caused by dewatering contraction, probably due to spontaneous contraction of colloidal sediments which often occurs during early compaction (Dewhurst et al, 1999a;Dewhurst et al, 1999b;Berndt et al, 2012). This theory can better explain the mapview polygonal geometry as the small normal faults intersect with each other (Ding et al, 2013). The PFs found in the Tertiary strata of the North Sea is interpreted to be formed under this genesis mechanism (Dewhurst et al, 1999a).…”

Section: Genesis Mechanisms Of Polygonal Faults (Pfs)mentioning

confidence: 97%

“…The 'density inversion' theory has also been proved by Nicol et al (2003), who proposed a density inversion model showing similar fault geometry, linkage and capture. However, this theory only suits the PFs developed in over-pressured low-density layers and cannot explain the PFs in normally pressured strata (Goulty, 2002;Ding et al, 2013).…”

Section: Genesis Mechanisms Of Polygonal Faults (Pfs)mentioning

confidence: 99%

“…Polygonal faults (PFs) are the network of layer-bound minor normal faults, which are generally characterized by polygonal planform geometry and variable strike directions (Lonergan et al, 1998a;Berndt et al, 2012;Laurent et al, 2012;Ding et al, 2013;Li et al, 2020). PFs were first found in the Lower Tertiary sediments in Belgium, but the polygonal planform pattern was not determined at the beginning due to the absence of 3D seismic data (Henriet et al, 1991).…”

Section: Introductionmentioning

confidence: 99%

“…PFs were proposed to be extensional non-tectonic in genesis occurring at comparatively shallow depth (Cartwright, 1994(Cartwright, ab, 2011. They are commonly featured by small fault throw (usually10-50 m), slight fault displacement (mostly< 100 m), steep in dip angles (typically 40-70 °), short horizontal extension in a single fault (commonly < 1500 m), and multi-direction strikes without preferential direction (Cartwright, 1994a(Cartwright, , 2011Cartwright and Dewhurst, 1998;He et al, 2010;Berndt et al, 2012;Ding et al, 2013; Figure 2). In addition to PFs, non-tectonic fractures can also occur in shale, formed during shale diagenesis and hydrocarbon generation and expulsion (Meng et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies often regarded PFs as dominant pathways for fluid migration, the presence of which was often interpreted to have facilitated vertical migration of oil and gas, therefore playing a vertical role in the shallower hydrocarbon accumulations (Larter et al, 2000;Gay et al, 2006;Hustoft et al, 2007;Ding et al, 2013;Alrefaee et al, 2018;Velayatham et al, 2021). For example, Alrefaee et al (2018) mentioned that the PFs in the Northern Carnarvon Basin acted as the conduits for the hydrocarbon migration, and Ding et al (2013) stated that the PFs in the Sanzhao sag of the Songliao Basin in China played a significant role in oil migration. However, no direct detailed evidence has been provided in these publications to prove the roles of PFs in facilitating vertical fluid migration.…”

Section: Introductionmentioning

confidence: 99%

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A Review of the Global Polygonal Faults: Are They Playing a Big Role in Fluid Migration?

et al. 2022

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Polygonal faults (PFs) have been widely found in over 100 sedimentary basins worldwide, mainly in marine setting on continental margins and intracratonic sedimentary basins. PFs are characterized by layer-bound minor normal faults arranged in polygonal patterns and multi-direction strikes, most of which were developed in fine-grained sediments rich in claystone. The genesis mechanisms of PFs have been recognized as non-tectonic, mainly including shear failure, syneresis, density inversion, low coefficients of friction and gravity sliding theory. Previous studies often regarded PFs as conduits playing a role in favouring fluid migration, which were also regarded as fluid source expelled during PF generation. However, some researchers proposed that the PF-bearing layer is generally impermeable and may act as a seal. To better understand the role of PFs in fluid migration and their contrition to the shallower hydrocarbon accumulation, a geophysical review of global PFs case studies is conducted in this paper. A comprehensive analysis is carried out based on abundant case studies, with key parameters analyzed including the PFs characteristics (e.g., buried depth, lithology, size, etc.), formation mechanisms of PFs, tectonic-sedimentary setting, and the spatial relationship of PFs, nearby major fluid migration pathways and high amplitude anomalies. The compilation of global PF case studies of shows that hydrocarbon fluids from the deep is more likely to migrate upward through normal big faults, gas chimneys or unconformities surface around PFs. In most cases, PFs play limited roles in fluid migration, such as in South China Sea where hydrocarbon accumulations have been observed under the PFs and the PF-bearing layer may act as a seal trapping the free gas underneath. Generally, the role of PFs in fluid migration should be determined through a comprehensive analysis of the characteristics of PFs, surrounding amplitude anomalies, hydrocarbon distribution, and even the sealing ability of PFs which needs further study. It is more likely that the PFs play a limited role in vertical fluid migration and related shallower hydrocarbon accumulation and distribution.

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Section: Genesis Mechanisms Of Polygonal Faults (Pfs)mentioning

confidence: 97%

Section: Genesis Mechanisms Of Polygonal Faults (Pfs)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A Review of the Global Polygonal Faults: Are They Playing a Big Role in Fluid Migration?

et al. 2022

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Investigating Narcondam offshore using high-resolution seismic reflection data

Srivastav,

Ghosal

2023

Geo-Mar Lett

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The Andaman Sea is a back-arc basin that hosts the active Barren and the dormant Narcondam volcanoes. Despite its geological and geophysical signi cance, there are limited studies conducted over offshore Andaman. Here, a geophysical study of Narcondam offshore is presented to investigate basinal deposits and associated uids and their migration paths using a 30 km long high-resolution 2D seismic re ection. The migrated section reveals a subsurface image highlighting evidence of a bright sea oorparallel re ector with negative polarity at a two-way time (TWT) of 2.78-2.82 s (~2.2-2.3 km) with an interval velocity of 1.56 km/s. Amplitude Versus Angle (AVA) analysis using Aki Richard's two-term equation is further conducted to characterize the reserved uid. The AVA analysis yields an increase in amplitude with angle, providing compelling evidence of uid presence. Additionally, the depth converted migrated seismic section exhibits indications of columnar faults of Neogene period in uencing the migration of uids within the basin.

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Organic geochemistry and organic matter enrichment mechanisms of the lacustrine source rocks from a small-faulted Basin: A case study of the Bayindulan, A'er and Wuliyasitai sags in the Erlian Basin, Northern China

Hou

et al. 2023

Geoenergy Science and Engineering

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Origin of polygonal fault systems: A case from the Sanzhao sag in the Songliao Basin, East China

Cited by 14 publications

References 22 publications

A Review of the Global Polygonal Faults: Are They Playing a Big Role in Fluid Migration?

A Review of the Global Polygonal Faults: Are They Playing a Big Role in Fluid Migration?

Investigating Narcondam offshore using high-resolution seismic reflection data

Organic geochemistry and organic matter enrichment mechanisms of the lacustrine source rocks from a small-faulted Basin: A case study of the Bayindulan, A'er and Wuliyasitai sags in the Erlian Basin, Northern China

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