Sealing capacity evolution of trap-bounding faults in sand-clay sequences: Insights from present and paleo-oil entrapment in fault-bounded traps in the Qinan area, Bohai Bay Basin, China

Song, Xianqiang; Meng, Lingdong; Fu, Xiaofei; Wang, Haixue; Sun, Yonghe; Jiang, Wenya

doi:10.1016/j.marpetgeo.2020.104680

Cited by 12 publications

(3 citation statements)

References 31 publications

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“…Previous studies conducted in various rift basins located offshore China, such as the Zhu I subbasin of the PRMB [74], the Xihu subbasin of the East China Sea Shelf Basin [10], and the Qinan area [27,46], Tangbei area [75], and Bozhong subbasin of the Bohai Bay Basin [76], have indicated similar hydrocarbon migration and accumulation patterns controlled by fault seals, albeit with some differences. Besides China, the North Sea also exhibits a pattern of hydrocarbon migration, accumulation, and distribution under the control of fault sealing [21,23,42].…”

Section: Role Of Faults For Fluid Migration In the Wenchang A Subbasinmentioning

confidence: 92%

“…For quantitatively predicting the volume and type of fault gouge within the fault zone, several algorithms have been developed, including the Clay Smear Potential (CSP) [33], Shale Smear Factor (SSF) [35], and Shale Gouge Ratio (SGR) [36]. Empirically, a high clay content within the fault zone is associated with a high capillary threshold pressure, but calibration is still necessary to assess the fault sealing capacity [46,47]. In addition, an associated geochemical analysis would help to reconstruct the hydrocarbon flow process [48,49].…”

Section: Introductionmentioning

confidence: 99%

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Fault Controls on Hydrocarbon Migration—An Example from the Southwestern Pearl River Mouth Basin

Xu,

Miocic,

Cheng

et al. 2024

Applied Sciences

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Faults play a pivotal role in controlling fluid migration and retention within sedimentary basins, particularly in the context of fault-bound hydrocarbon reservoirs. Assessing the stability and sealing capabilities of faults enhances our comprehension of these systems and aids in the identification of pathways for fluid migration. In this study, we focus on a series of fault-bound hydrocarbon accumulations located in the southern Wenchang A subbasin within the Pearl River Mouth Basin. We emphasize the significant influence of faults in governing the processes of hydrocarbon migration and accumulation. By leveraging 3D seismic data and well information, we have assessed the sealing potential of ten faults that either currently retain hydrocarbon columns or have the potential to do so. Our analysis reveals that even faults with a relatively low Shale Gouge Ratio (as low as 15%) can effectively support substantial column heights. Taking into account factors, such as the source rock maturity, fault activity, geometry, sealing potential, and the distribution of hydrocarbon accumulations, we have formulated a conceptual model for hydrocarbon migration and accumulation within the study area. This model underscores potential fluid traps within the rift basin, shedding light on the complex dynamics of hydrocarbon movement in this region.

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Section: Role Of Faults For Fluid Migration In the Wenchang A Subbasinmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Fault Controls on Hydrocarbon Migration—An Example from the Southwestern Pearl River Mouth Basin

Xu,

Miocic,

Cheng

et al. 2024

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…The value of considering the fault growth history in assessing the potential of faults to seal or leak fluids has recently received increased interest (e.g., Reilly et al, 2017;Song et al, 2020;Michie & Braathen, 2023). While assessing present-day juxtaposition relationships and fault sealing potential is a valuable approach when considering reservoir behaviour over relatively short (i.e., a few tens of years) production timescales, it does not capture the changes that may occur to fault hydraulic properties over longer, geological timescales (e.g., Manzocchi et al, 2010;Reilly et al, 2017).…”

Section: Fault Network Kinematics and Sealing Potentialmentioning

confidence: 99%

The Role of Normal Fault Growth History in Influencing Fault Seal Potential, Samson Dome, Offshore Norway

Alghuraybi,

Bell,

Jackson

2023

Preprint

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The growth of normal faults can influence subsurface fluid flow and entrapment within rift basins. However, fault seal studies typically view faults as static structures, with their growth and the potential related temporal changes in hydraulic properties being ignored. In this study, we use borehole data and a high-quality 3D full-stack depth migrated seismic reflection volume to analyse the growth history of the normal fault network in the Samson Dome area, SW Barents Sea. We specifically focus on how the kinematic history of normal faults impacts their sealing properties, whilst also considering their origin and implications for regional salt tectonics. We show that the faults formed during two distinct phases in the Late Triassic and Middle Jurassic-to-Early Cretaceous, and two phases of dome growth occurred in the Late Triassic and Late Cretaceous, challenging existing proposals for the timing of the development of structure. The salt-tectonic origin of the Samson Dome itself remains enigmatic, although mechanical considerations suggest existing models require refinement. Our fault seal analysis reveals a correlation between displacement patterns and sealing potential, as reflected in the Shale Gouge Ratio (SGR) values of different fault groups. More specifically, faults that grew via vertical linkage of initially isolated segments and experienced potential reactivation exhibit lower SGR values, implying a higher likelihood of across and along-fault leakage. Conversely, faults lacking evidence for reactivation or vertical linkage show higher SGR values, suggesting better sealing potential. Notably, the accuracy of our fault seal analysis is greatly influenced by the calculation methods used for Vshale, particularly for faults with low displacement. Our study provides valuable insights into the faulting, development, and sealing potential of the Samson Dome area. We also highlight the importance of careful consideration of Vshale calculation methods when conducting fault seal analysis.

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Reactivation of a trap-boundary fault and its impacts on hydrocarbon migration and accumulation in Longkou 7 − 6 structure, Bohai Bay Basin: insights from geology, geophysics and basin modeling

Yan,

Wang,

Wang

et al. 2024

J Petrol Explor Prod Technol

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Sealing capacity evolution of trap-bounding faults in sand-clay sequences: Insights from present and paleo-oil entrapment in fault-bounded traps in the Qinan area, Bohai Bay Basin, China

Cited by 12 publications

References 31 publications

Fault Controls on Hydrocarbon Migration—An Example from the Southwestern Pearl River Mouth Basin

Fault Controls on Hydrocarbon Migration—An Example from the Southwestern Pearl River Mouth Basin

The Role of Normal Fault Growth History in Influencing Fault Seal Potential, Samson Dome, Offshore Norway

Reactivation of a trap-boundary fault and its impacts on hydrocarbon migration and accumulation in Longkou 7 − 6 structure, Bohai Bay Basin: insights from geology, geophysics and basin modeling

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