Late Holocene stratigraphic evolution and sedimentary facies of an active to abandoned tide‐dominated distributary channel and its mouth bar

This paper documents the Late-Holocene environmental changes and human presence in the northern Danube delta using a multidisciplinary approach that combines geoscientific data with archaeological findings, historical texts, and maps. It follows the formation and progression of the Chilia distributary and the reconfiguration of socioeconomic activities. Sedimentary facies identified on five new cores by changes in texture properties, magnetic susceptibility, geochemistry, and macro- and microfauna composition together with the newly obtained chronology constrain the complex evolution of the Chilia branch as filling in a long-lasting bay and then of a giant lagoon (Thiagola) which covered most of the northern delta since the Old Danube lobe inception (ca. 7500 yrs BP) till modern Chilia development. It initiated during the Greek Antiquity (ca. 2500 yrs ar BP) at the delta apex, while in Roman times (ca. 1800 yrs BP) it pursued its slow flowing into the vast Thiagola Lagoon. The most dramatic transformations occurred in the last 800 years when the river passed east of the Chilia promontory, rapidly went through the present-day Matița-Merhei basin (several decades), and created its first open-sea outlet. Solid discharge increased in two distinct periods, once in the Middle Ages (ca. 750 yrs BP) and then in the Modern Period (ca. 150 yrs BP) due to human-induced land-use changes in the Danube watershed. The chronology of the cultural remains on the pre-deltaic Chilia promontory and the multiproxy analysis of a sediment core retrieved nearby downstream suggest the terrestrial connection of the island with the mainland in ancient times. The hitherto contended issue of the old Thiagola Lagoon and its location are redefined here, as are the original identifications of ancient and medieval toponyms and hydronyms, especially for Chilia-Licostomo, Byzantine, Genoese, Moldavian, Ottoman, and Russian trading point of great importance in the political and economic history of the Black Sea and neighboring regions.

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Contrasting geomorphic and stratigraphic responses to normal fault development during single and multi-phase rifting

10.31223/x5j03h ◽

2021 ◽

Author(s):

Sofia Pechlivanidou ◽

Anneleen Geurts ◽

Guillaume Duclaux ◽

Robert Gawthorpe ◽

Christos Pennos ◽

...

Keyword(s):

Normal Fault ◽

Sedimentary Facies ◽

Surface Processes ◽

Extension Direction ◽

Multi Phase ◽

Fault Growth ◽

Stratigraphic Evolution ◽

The Impact ◽

Topographic Evolution ◽

Previous Phase

Understanding the impact of tectonics on surface processes and the resultant stratigraphic evolution in multi-phase rifts is challenging, as patterns of erosion and deposition related to older phases of extension are overprinted by the subsequent extensional phases. In this study, we use a one-way coupled numerical modelling approach between a tectonic and a surface processes model to investigate topographic evolution, erosion and basin stratigraphy during single and multi-phase rifting. We compare the results from the single and the multi-phase rift experiments for a 5 Myr period during which they experience equal amounts of extension, but with the multi-phase experiment experiencing fault topography inherited from a previous phase of extension. Our results demonstrate a very dynamic evolution of the drainage network that occurs in response to fault growth and linkage and, to depocentre overfilling and overspilling. However, we observe profound differences between topographic and depocenter development during single and multi-phase rifting with implications for sedimentary facies development. Our quantitative approach, enables us to better understand the impact of changing extension direction on the distribution of sediment source areas and the syn-rift stratigraphic development through time and space.

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The Law of Reservoir Property Change both before and after Water Flooding in Liaohe Oilfield

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.733.31 ◽

2015 ◽

Vol 733 ◽

pp. 31-34

Author(s):

Yan Zhang ◽

Shuang Yu

Keyword(s):

Physical Properties ◽

Water Flooding ◽

Pore Throat ◽

Reservoir Properties ◽

Throat Radius ◽

Liaohe Oilfield ◽

Before And After ◽

Mouth Bar ◽

Oilfield Development ◽

Distributary Channel

In order to explore the change laws of physical properties and pore throat radius of reservoir both before and after water flooding to guide the oilfield in-depth fluid diversion, the reservoir properties are analyzed on the basis of core data of early exploratory well and inspection well in the middle and later stages of oilfield development. The theory of reservoir geology and development geology is used to study the change laws of reservoir properties both before and after water flooding in May 20th Development Area of Liaohe oilfield. The research result indicates that reservoir physical properties and pore throat radius have changed in the different period and different microfacies types of sand body [1-3].The permeability is changed far outweigh porosity in the physical properties of reservoir. And with the increase of time, the biggest change is the porosity and permeability of distributary channel, the next are margin of channels, mouth bar. The thin layer of channels and distal bar of physical properties have changed lesser or not. The pore throat radius has declined following distributary channel, mouth bar, thin layer of channels and distal bar in the sedimentary microfacies [4-5].The study results are helpful for the establishment of production measures at the later stage of oilfield development.

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Sedimentary Research of Block8 in Jinglou Oilfield

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1010-1012.1435 ◽

2014 ◽

Vol 1010-1012 ◽

pp. 1435-1439

Author(s):

Jun Jie Li ◽

Yuan Fu Zhang ◽

Guo Guo Liu

Keyword(s):

Research Area ◽

Sedimentary Structure ◽

Structure Characteristics ◽

Progressive Development ◽

Mouth Bar ◽

Distributary Channel

By core observation and logging in Block8, Jinglou oilfield, we distinguished the sedimentary structure characteristics and the logs’ features of subaqueous distributary channel, mouth bar, sheet sand and interdistributary. Then we promoted it in the whole region, and characterised the sedimentary faices of every layers. So we provide a reliable geological basis for progressive development in research area.

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A Preliminary Study on Sedimentary Mode of Putaohua Oil Layer in the East of Sanzhao Depression

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.524-527.3 ◽

2012 ◽

Vol 524-527 ◽

pp. 3-9

Author(s):

Lin Cong ◽

Shi Zhong Ma ◽

Yu Sun ◽

Ru Bin Li

Keyword(s):

Transition Region ◽

Developmental Process ◽

Sedimentary Facies ◽

Oil Field ◽

Sedimentary Characteristics ◽

Sand Surface ◽

Sand Body ◽

Delta System ◽

Preliminary Study ◽

Distributary Channel

Based on ten well cores, seventeen hundred logging data and initial potential data, sedimentary characteristics and mode of shallow lacustrine fluvial-dominated delta of Putaohua oil layer in the east of Sanzhao depression were analyzed. It is realized that distributary channel sandbodies as sand body framework of this delta system, which is abundant, closely and narrow, and the framework of sand body is in a large number of narrow banded shape (mostly 200 ~ 300m), and can extend hundreds of kilometers of continuous, dense, overall was SW, and combines well with other types sand surface to become a better distributary channel sand body. Based on understanding of sedimentary background, developmental process, sedimentary characteristics and sedimentary facies type of Putaohua oil layer in Sanzhao depression, sedimentary mode of shallow lacustrine fluvial-dominated delta is established in the study area, and sedimentary mode of five subfacies is further divided: Delta distributary plain subfacies is mode of fluvial-dominated belt body; Transition region of front-distributary plain is mode of inshore; Inner front is mode of fluvial-dominated belt body; Transition region of inner front-outer front is mode of fluvial-dominated sheet sand; Shallow lacustrine fluvial-dominated delta outer front is mode of tide-dominated sheet sand; Also pointed out that overall shows NE –SW trending submerged distributary channel sandbodies which is abundant, closely and narrow is the main reservoir of the study area. It provides the solid geological basis for the establishment of spatial distribution pattern of reservoir; identify the causes of mainly monosandbody and further tapping the potential of oil field.

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The Holocene dynamics of Ryder Glacier and ice tongue in north Greenland

The Cryosphere ◽

10.5194/tc-15-4073-2021 ◽

2021 ◽

Vol 15 (8) ◽

pp. 4073-4097

Author(s):

Matt O'Regan ◽

Thomas M. Cronin ◽

Brendan Reilly ◽

Aage Kristian Olsen Alstrup ◽

Laura Gemery ◽

...

Keyword(s):

Climate Change ◽

Late Holocene ◽

Sediment Cores ◽

Ice Sheet ◽

Greenland Ice Sheet ◽

Sedimentary Facies ◽

Climate Forcing ◽

The Holocene ◽

Middle Holocene ◽

Vulnerability To Climate Change

Abstract. The northern sector of the Greenland Ice Sheet is considered to be particularly susceptible to ice mass loss arising from increased glacier discharge in the coming decades. However, the past extent and dynamics of outlet glaciers in this region, and hence their vulnerability to climate change, are poorly documented. In the summer of 2019, the Swedish icebreaker Oden entered the previously unchartered waters of Sherard Osborn Fjord, where Ryder Glacier drains approximately 2 % of Greenland's ice sheet into the Lincoln Sea. Here we reconstruct the Holocene dynamics of Ryder Glacier and its ice tongue by combining radiocarbon dating with sedimentary facies analyses along a 45 km transect of marine sediment cores collected between the modern ice tongue margin and the mouth of the fjord. The results illustrate that Ryder Glacier retreated from a grounded position at the fjord mouth during the Early Holocene (> 10.7±0.4 ka cal BP) and receded more than 120 km to the end of Sherard Osborn Fjord by the Middle Holocene (6.3±0.3 ka cal BP), likely becoming completely land-based. A re-advance of Ryder Glacier occurred in the Late Holocene, becoming marine-based around 3.9±0.4 ka cal BP. An ice tongue, similar in extent to its current position was established in the Late Holocene (between 3.6±0.4 and 2.9±0.4 ka cal BP) and extended to its maximum historical position near the fjord mouth around 0.9±0.3 ka cal BP. Laminated, clast-poor sediments were deposited during the entire retreat and regrowth phases, suggesting the persistence of an ice tongue that only collapsed when the glacier retreated behind a prominent topographic high at the landward end of the fjord. Sherard Osborn Fjord narrows inland, is constrained by steep-sided cliffs, contains a number of bathymetric pinning points that also shield the modern ice tongue and grounding zone from warm Atlantic waters, and has a shallowing inland sub-ice topography. These features are conducive to glacier stability and can explain the persistence of Ryder's ice tongue while the glacier remained marine-based. However, the physiography of the fjord did not halt the dramatic retreat of Ryder Glacier under the relatively mild changes in climate forcing during the Holocene. Presently, Ryder Glacier is grounded more than 40 km seaward of its inferred position during the Middle Holocene, highlighting the potential for substantial retreat in response to ongoing climate change.

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Late Holocene Red Sea Coastal Evolution: Evidence from Shallow Subsurface Sedimentary Facies, North Al-Wajh, Saudi Arabia

Thalassas An International Journal of Marine Sciences ◽

10.1007/s41208-020-00248-2 ◽

2020 ◽

Author(s):

Ibrahim M. Ghandour ◽

Jawad Majeed ◽

Aaid G. Al-Zubieri ◽

Ammar A. Mannaa ◽

Mohammed H. Aljahdali ◽

...

Keyword(s):

Saudi Arabia ◽

Red Sea ◽

Late Holocene ◽

Sedimentary Facies ◽

Coastal Evolution ◽

Shallow Subsurface

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The Relationship Analysis between Water Injection and Microfacies of SHA1 Reservoir of Liao He Basin, China

The Scientific World JOURNAL ◽

10.1155/2014/641571 ◽

2014 ◽

Vol 2014 ◽

pp. 1-5

Author(s):

Qing Wang ◽

Zhanguo Lu ◽

Shiguang Guo ◽

Chao Wang

Keyword(s):

Water Injection ◽

Injection Pressure ◽

Leading Edge ◽

Inversion Method ◽

Injection Wells ◽

Relationship Analysis ◽

Before And After ◽

Mouth Bar ◽

The Relationship ◽

Distributary Channel

SHA1 is the representative reservoir in Liao He Basin. Through the introduction of curvature displayed on the gray scale, we determine the substructure and fractures. Geostatistical inversion method is used to help study the porosity of reservoir. The relationship between interval transit times and resistivity among mudstone and sandstone, before and after water injection, is analyzed. The relationship between porosity and permeability and the relationship between porosity and impedance from core analysis were studied. Through the whole information above, we divide the microfacies of SHA1 reservoir to distributary channel, mouth bar, the leading edge thin sand, and prodelta mud. The water injections in different microfacies are studied. The distributary channel should be used by large distant injection wells or smaller injection pressure injection. The smaller distant injection wells or large injection pressure should be used in the mouth bar. The arrangement of well injection need consider the different sedimentary microfacies.

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Study on Sedimentary Facies of Carboniferous Kalashayi Formation in the South of Tahe Oilfield

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.433-440.1745 ◽

2012 ◽

Vol 433-440 ◽

pp. 1745-1750

Author(s):

Kang Ning Liu ◽

Zai Xing Jiang ◽

Da Kang Zhong ◽

Rong Kang ◽

Yue Cao

Keyword(s):

Intertidal Zone ◽

Rock Type ◽

Sedimentary Facies ◽

Petroleum Exploration ◽

The South ◽

Tahe Oilfield ◽

Mud Flat ◽

Mouth Bar ◽

Development Area ◽

Flat Sand

Tahe Oilfield is an significant petroleum exploitation and development area in Tarim Basin for SINOPIC. Carboniferous Kalashayi Formation has become an important oil-bearing series for increasing and maintaining production, and for finding backup resource in this Oilfield. Based on the theories and methods of sedimentology, by using the sesmic, log and core data, the sedimentary facies of Carboniferous Kalashayi Formation in the south of Tahe Oilfield are analyzed deeply. Through the study of characteristics of the rock type and texture,sedimentary structure, sedimentary sequence, stratic structure, paleontology, geochemistry and geophysics of Kalashayi Formation, the Sand-shale Section is attributed to tidal flat deposits which has a nature of estuary. The study area are mainly dominated by intertidal zone, including mud flat, sand-mud flat, sand flat, tidal channel and mouth bar microfacies. The Up-mudstone Section developed lagoonal facies. This study provides favorable support for the further petroleum exploration in study area.

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The Control of Palegeomorphology on Sedimentary Systems in Southeast Qianjiang Depression, Lower Xingouzui Formation, Jianghan Basin

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.733.71 ◽

2015 ◽

Vol 733 ◽

pp. 71-75 ◽

Cited By ~ 1

Author(s):

Feng He ◽

Chang Song Lin ◽

Xiao Qing Zhang

Keyword(s):

Deep Lake ◽

Mouth Bar ◽

Depositional Systems ◽

Jianghan Basin ◽

Structural Slope Break Belt ◽

Distributary Channel ◽

Beach Bar

The pale geomorphology of Lower Xingouzui Formation is controlled by synsedimentary faults. The pale geomorphology controls the distribution of depositional systems, the development of underwater distributary channel controlled by groove and structural slope break belt, combination features of underwater distributary channel and mouth bar controlled by sedimentary slope break, beach bar developed in paleo-uplift, shore-shallow lacustrine and semi-deep lake developed in sag zone.

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