Seismic geomorphology and sedimentology of a fluvial-dominated delta: Implications for the Neogene reservoirs, offshore Bohai Bay Basin, China

Xu, Shang; Hao, Fang; Xu, Cheng; Zou, Huayao; Gao, Baishui

doi:10.1306/0130191522517122

Cited by 11 publications

(13 citation statements)

References 36 publications

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“…Sand deposits left by the ancient river are also being explored for their potential in coastal restoration, with 530 Mt of potential deposits so far identified (Wang and Xu, 2018). But, even if that sediment was routed to the coastline, it might not remain there (Xu et al, 2019). If routed to forested wetlands, though, it could enhance sediment retention and create a sustainable ecosystem (Rutherford et al, 2018).…”

Section: Future Of the Mississippi River And Its Deltamentioning

confidence: 99%

“…However, hard engineering structures are expensive, and the delta already faces a crisis due to over-engineering (Blum, 2019). Therefore, soft engineering strategies, where engineers now look to mimic natural fluvial processes, have been suggested to mitigate land loss in coastal Louisiana (Day et al, 2018; Xu et al, 2019).…”

Section: Future Of the Mississippi River And Its Deltamentioning

confidence: 99%

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Geological evolution of the Mississippi River into the Anthropocene

Russell

Waters

Himson

et al. 2021

The Anthropocene Review

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The Mississippi River maintains commercial and societal networks of the USA along its >3700 km length. It has accumulated a fluvial sedimentary succession over 80 million years. Through the last 11,700 years of the Holocene Epoch, the wild river shaped the landscape, models of which have become classic in geological studies of ancient river strata. Studies of the river were led by the need to develop infrastructure and to search for hydrocarbons, through which, these models have become quite sophisticated. However, whilst the models demonstrate how the wild river behaves, a monumental shift in fundamental controls on the entire fluvial system, broadly coinciding with the proposed mid-20th century onset of the Anthropocene Epoch, has generated new geological patterns that are becoming globally ubiquitous, and which the Mississippi River typifies. As such, whilst classic Holocene river models may be compared to human-modified systems such as the Lower Mississippi River (and others worldwide), locally the models may now only directly apply to its fossilized components preserved in the sub-surface. Such river models need adapting to better understand the present dynamics, and future evolution of these landscapes.

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Section: Future Of the Mississippi River And Its Deltamentioning

confidence: 99%

Section: Future Of the Mississippi River And Its Deltamentioning

confidence: 99%

Geological evolution of the Mississippi River into the Anthropocene

Russell

Waters

Himson

et al. 2021

The Anthropocene Review

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“…to the formation of overpressure has been discovered and confirmed (Guo et al, 2011(Guo et al, , 2012. The authors propose that the overpressure in the tensioning basin is mainly caused by unbalanced compaction and hydrocarbon generation, which develop at different diagenetic stages and burial depths Xu et al, 2019a. The deep water area of Baiyun Sag in the Pearl River Mouth Basin in the northern continental margin of the South China Sea is a hydrocarbon rich depression which has been proved by exploration practice (Figure 1) (Sun et al, 2011). It has the characteristics of hydrocarbon resources, which are both oil-gas generation and gasdominated (Shi et al, 2007;Hu et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Overpressure characteristics and geological origin of the paleogene in Baiyun Sag, Pearl River Mouth Basin

Xiong

Cheng²,

Guo³

et al. 2023

Front. Earth Sci.

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The accurate understanding of the origin of overpressure is the basis of formation pressure research and the core work of determining the distribution of formation pore pressure in drilling design. The deep water area of Baiyun Sag in the Pearl River Mouth Basin in the northern margin of the South China Sea has been proved to be a hydrocarbon rich depression. In recent years, overpressure has been encountered in the middle and deep layers, but the geological origin of the overpressure in the deep water area are still unclear. Therefore, the pore pressure profile of the Baiyun Sag was evaluated using the data of drilling and seismic velocity, and the relationship between overpressure and the generation mechanism was established. Most of the surrounding and shallow strata of Baiyun Sag show normal pressure, while the middle and deep strata generally show overpressure, with the maximum pressure coefficient up to 1.55. The overpressure zone mainly develops from the middle of Zhujiang Formation to the upper member of Enping Formation. The mudstone resistivity and density values of the two typical Wells deviated from the normal trend. The density showed a constant trend with the increase of depth, while the resistivity showed a certain degree of reversal. The upper layer of the overpressure zone showed abnormally high resistivity values, corresponding to the overgland and transition zone formed by high carbonate content. There is no obvious increase of porosity in the overpressured sandstone strata of Baiyun sag, which does not have the characteristics of undercompaction. The velocity in the overpressure section of the two Wells varies greatly, and the density is basically unchanged or slightly decreased. It is concluded that the overpressure is caused by fluid expansion from hydrocarbon-generation. The large-scale and long-term fluid expansion caused by hydrocarbon generation and expulsion of source rocks provides the power source for the formation of overpressure in Baiyun sag. The distribution of effective source rocks has a controlling effect on the distribution range of overpressure. The tight sandstone strata in the Zhuhai, Wenchang and Enping formations become the cover layer of the overpressure system in the longitudinal direction.

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“…With the application and development of seismic frequency, the boundaries and thicknesses of meander-river reservoirs were well detected in many cases (Bitrus et al, 2016;McArdle et al, 2014;Wang et al, 2017;Zeng, 2017;Xu et al, 2019;Li et al, 2019). Sun et al (2020b) dissected the internal unites of subsurface meander-river reservoirs through the corresponding relationship between the geometric characteristics of sand bodies in the superposition zone of point bars and seismic architecture.…”

Section: Introductionmentioning

confidence: 99%

Identification and Quantitative Characterization of Point Bars in Subsurface Meander-River Belt, Taking Chengdao Oilfield in Bohai Bay Basin as an Example

et al. 2022

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Reservoir architecture is an important basis for studying the sedimentary evolution of underground reservoirs and the distribution of remaining oil. Taking meander-river reservoir of Guantao Formation in Chengdao Oilfield as an example, characteristics of the evolution of subsurface meander-belt deposits were studied by seismic sedimentology. Seismic lithology is performed using -90° phase wavelet and frequency fusions; seismic geomorphology is conducted on seismic stratal slices. Six meandering belts were defined in the target layer, and the sediment at the bottom is characterized by the transformation from “braided” river to “meandering” river. The width of meander-river belt has no correlation with the maximum thickness of meander-river belt. But it has obvious negative correlation differences in the minimum thickness of meander–river belt. With the increase of width of the meander-river belt, the minimum thickness of the drilled meander-river belt decreases as a whole. The forward model based on the shape of point bar reveals the seismic architecture characteristics formed by the superposition of sand bodies at different positions of point bars. According to these characteristics, the point bars in the meandering zone can be explained. In the Ng33, Ng42, and Ng45 sub-layers of the study area, the corresponding meander-belt widths where the point bar (or point bar connecting body) cannot be effectively identified by well logging and seismic data, are, respectively, 800, 800, and 500 m. At the same time, when the width of the meander belt is greater than 1000 m, three or more than three point bars (or point bar connecting body) can be basically identified in the meander belt. The width of the point bar segments in the meander belt of the three main sub-layers is mostly 300–400 m, and the maximum width of the point bar segments is about 550 m, while the scale of point bars in Ng45 sub-layer meander belt is relatively small. The quantitative characteristics of point bar debris and the determined location of SBM and SIA sand bodies provide limited and valuable data support for the formation and simulation of underground meandering rivers, which are also useful for the model of the target reservoir.

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Seismic geomorphology and sedimentology of a fluvial-dominated delta: Implications for the Neogene reservoirs, offshore Bohai Bay Basin, China

Cited by 11 publications

References 36 publications

Geological evolution of the Mississippi River into the Anthropocene

Geological evolution of the Mississippi River into the Anthropocene

Overpressure characteristics and geological origin of the paleogene in Baiyun Sag, Pearl River Mouth Basin

Identification and Quantitative Characterization of Point Bars in Subsurface Meander-River Belt, Taking Chengdao Oilfield in Bohai Bay Basin as an Example

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