Study on Sedimentary Macrofacies of Sandy Group V of the Second Section of Qingshankou Formation, Daqingzi Region

According to the core observation and log facies analysis, in the stage of the sand group V of the second section of Qingshankou formation, it mainly develop the delta of type IV which was proposed by Coleman and Wright and in Daqingzi region ,the delta can be classified into two subfacies : delta front and prodelta. The delta front can be divided into underwater distributary channel, river mouth bar, offshore sandbar, coastal sand sheet, interdistributary bay and shallow lake. According to the distribution of sedimentary macrofacies, it can provide guidance to find favorable areas.

Download Full-text

Study on Depositional Model of XinMiaoxi-Xinbei Region Fuyu Oil Layer in the Northern Fuxin Uplift of Songliao Basin

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1092-1093.1470 ◽

2015 ◽

Vol 1092-1093 ◽

pp. 1470-1473

Author(s):

Yue Li ◽

Shi Zhong Ma ◽

Qi Wang

Keyword(s):

Facies Analysis ◽

Depositional Model ◽

Delta Front ◽

Development Zone ◽

Natural Levee ◽

Main Development ◽

Single Well ◽

Sedimentary Microfacies ◽

Channel Control ◽

Distributary Channel

XinMiaoxi-Xinbei region fuyu reservoir of lower cretaceous quantou forth group sedimentary period develop large shallow-water delta sedimentary, which based on core data and logging information of 44 wells through the analysis of single well facies and logging facies analysis and the research of sedimentary microfacies. This area incude two kinds of subfacies,delta distributary plain,delta front.15 kinds of microfacies such as distributary channel,underwater distributary channel natural levee. Put forward the "source of phase controlled sand", "channel control reservoir" thought, predicted the main development zone of Fuyu reservoir of XinMiaoxi-Xinbei.

Download Full-text

Characteristics of Petroleum Geology and Prediction of Favorable Areas in Jiufotang Formation, Kazuo Basin

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.361-363.3 ◽

2011 ◽

Vol 361-363 ◽

pp. 3-7

Author(s):

Qiang Guo ◽

Da Kang Zhong ◽

Yu Lin Wang ◽

Yan Chun Zhong

Keyword(s):

Source Rock ◽

Source Rocks ◽

Hydrocarbon Source Rock ◽

Delta Front ◽

Actual Measurement ◽

Fan Delta ◽

Hydrocarbon Source Rocks ◽

Mouth Bar ◽

Exploration Area ◽

Distributary Channel

Through the research on actual measurement 106km geological profile, the hydrocarbon source rocks mainly develop the third member of Jiufotang formation, followed by the second member. There are five distribution areas where have been divided hydrocarbon source rocks thickness is more than 400m in study area. Among them, Jiufotang area has the greatest sedimentary thickness of hydrocarbon source rocks, while Siguanyingzi-Sanjiazi area has the largest area where hydrocarbon source rocks are more than 400m. Oil shale is good hydrocarbon source rock, while dark gray and black gray mudstone (or shale) are relatively poor. The fan delta front subaqueous distributary channel and mouth bar are well-developed in basin’s fault zone and also the important favorable reservoir, followed by braided delta front mouth bar, subaqueous distributary channel and distal bar developing in northwestern area of the basin. There are four forms of source-reservoir-cap combination: (1) hydrocarbon source rock in the above layer and reservoir in the below layer; (2) hydrocarbon source rock and reservoir in the same layer; (3) normal form; (4) fingerlike intersection. The combination of fingerlike intersection is the most important forms in study area. Fan delta facies next to lacustrine facies is favorable exploration area.

Download Full-text

Sedimentological Influence on Physical Properties of a Tight Sandstone Reservoir: The Cretaceous Nenjiang Formation, Southern Songliao Basin, Northeast China

Frontiers in Earth Science ◽

10.3389/feart.2021.606701 ◽

2021 ◽

Vol 9 ◽

Author(s):

Jinkai Wang ◽

Jialin Fu ◽

Jieming Wang ◽

Kai Zhao ◽

Jinliang Zhang ◽

...

Keyword(s):

Physical Properties ◽

Songliao Basin ◽

Physical Parameters ◽

Tight Sandstone ◽

Reservoir Properties ◽

Delta Front ◽

Sedimentary Process ◽

Throat Radius ◽

Mouth Bar ◽

Distributary Channel

Abstract:The Nenjiang Formation, south of Songliao Basin, has many hydrocarbon bearing units, but currently the understanding of the distribution of viable reservoir sandstones is too limited to support a development strategy. Therefore, a detailed study on the sedimentary microfacies and reservoir properties has been completed in order to reduce uncertainty and improve subsurface predictions. Nine lithofacies and five lithofacies associations were identified supporting the development of a sedimentary model of a river-dominated delta front setting, which could be divided into four sedimentary environments: subaqueous distributary channel-fill, mouth bar, sand sheet, and interdistributary bay. The distribution sandbodies extend to the south in a tongue-like form, and they thin and pinch out. Finally, the influence of sedimentary process on properties was assessed by establishing the correlation between microfacies and reservoir physical parameters, such as porosity, permeability, pore radius, throat radius, and clay minerals. It is revealed that the correspondence between reservoir physical properties and microfacies types is strong; the physical properties of the subaqueous distributary channel and mouth bar are the best.

Download Full-text

Link between East Asian summer monsoon and sedimentation in river-mouth sandbars since the early Holocene preserved in the Yangtze River subaqueous delta front

Quaternary Research ◽

10.1017/qua.2020.1 ◽

2020 ◽

Vol 95 ◽

pp. 84-96

Author(s):

Gang Xu ◽

Jian Liu ◽

Marcello Gugliotta ◽

Yoshiki Saito ◽

Lilei Chen ◽

...

Keyword(s):

Yangtze River ◽

Late Holocene ◽

Asian Summer Monsoon ◽

Yangtze River Basin ◽

River Mouth ◽

Early Holocene ◽

The Yangtze River ◽

Delta Front ◽

The Yangtze River Basin ◽

Asian Summer

AbstractThis paper presents geochemical and grain-size records since the early Holocene in core ECS0702 with a fine chronology frame obtained from the Yangtze River subaqueous delta front. Since ~9500 cal yr BP, the proxy records of chemical weathering from the Yangtze River basin generally exhibit a Holocene optimum in the early Holocene, a weak East Asian summer monsoon (EASM) period during the middle Holocene, and a relatively strong EASM period in the late Holocene. The ~8.2 and ~4.4 cal ka BP cooling events are recorded in core ECS0702. The flooding events reconstructed by the grain-size parameters since the early Holocene suggest that the floods mainly occurred during strong EASM periods and the Yangtze River mouth sandbar caused by the floods mainly formed in the early and late Holocene. The Yangtze River-mouth sandbars since the early Holocene shifted from north to south, affected by tidal currents and the Coriolis force, and more importantly, controlled by the EASM. Our results are of great significance for enriching both the record of Holocene climate change in the Yangtze River basin and knowledge about the formation and evolution progress of the deltas located in monsoon regions.

Download Full-text

Mechanics of river mouth bar formation: Implications for the morphodynamics of delta distributary networks

Journal of Geophysical Research Atmospheres ◽

10.1029/2006jf000574 ◽

2007 ◽

Vol 112 (F2) ◽

Cited By ~ 87

Author(s):

D. A. Edmonds ◽

R. L. Slingerland

Keyword(s):

River Mouth ◽

Mouth Bar ◽

Bar Formation

Download Full-text

Holocene palaeoceanographic evolution of the Iskenderun bay, South-Eastern Turkey, as a response to river mouth diversions and human impact

Mediterranean Marine Science ◽

10.12681/mms.3 ◽

2000 ◽

Vol 1 (1) ◽

pp. 19 ◽

Cited By ~ 8

Author(s):

S. SPEZZAFERRI ◽

D. BASSO ◽

H. KORAL

Keyword(s):

Large Scale ◽

River Mouth ◽

Environmental Evolution ◽

Forest Clearing ◽

Low Salinity ◽

The Core ◽

Cladocora Caespitosa ◽

Eastern Turkey ◽

Iskenderun Bay ◽

Delta Progradation

A quantitative study of benthic foraminifera, sediment texture and composition from two cores was performed to unravel the environmental evolution of the Iskenderun Bay (eastern Turkey) in the Holocene. Core 29 (NE Iskenderun Bay) consists of clay and silt from the top of the core down to 35 cm with dominant bioclasts (coral Cladocora caespitosa) from 35 cm down to the bottom of the core. Core 92, located near an ancient Ceyhan River mouth (Yumurtalik), consists of sandy and silty sediment passing to homogeneous clay and silt at about 48 cm from the top. Several grab samples show very coarse biogenic detritus covered by a centimetric veneer of sandy silt and clay. Radiocarbon dating of corals, molluscs and algae from core 29 and five selected grab samples, the sediment and foraminiferal study indicate that at least three pulses of muddy sedimentation occurred in the bay. (1) An older pulse (about 3700 yrs BP) related to the large-scale forest clearing (Beysheir Occupation Phase). (2) Another pulse coincides with a major delta progradation of the Ceyhan River at about 2140 years BP. (3) A younger pulse follows the diversion of the Ceyhan River mouth toward Yumurtalik, from the Middle Age to 1935.Species interpreted as tolerant of low salinity indicate that the influence of the Ceyhan was minor when the river drained directly into the Mediterranean Sea (approximately 2000 years BP) and progressively increased when the river diverted towards Yumurtalik.

Download Full-text

Long-term challenge to mangrove in the National park Xuanthuy – data released from shallow subsidence monitoring

VNU Journal of Science Earth and Environmental Sciences ◽

10.25073/2588-1094/vnuees.4221 ◽

2018 ◽

Vol 34 (3) ◽

Author(s):

Le Xuan Thuyen

Keyword(s):

Sea Level Rise ◽

Sea Level ◽

National Park ◽

Low Cost ◽

River Mouth ◽

Biosphere Reserve ◽

The United States ◽

Red River ◽

United States Geological Survey ◽

The Core

A small mangrove colony growing for several decades on a mud flat on the left side of Balat River mouth has become today a large and healthy forest, containing a high ecosystem service value in the core of the Red River biosphere reserve. As a pioneer ecosystem located at land– water interface in the tropic, there exist always risks to mangroves, especially due to climate change and sea level rise. Sea level rise is a worldwide process, but subsidence is a local problem that can exacerbate these geo-hazards. A monitoring of shallow subsidence has been carried out by using SET-MH technique (developed by the United States Geological Survey) to track the both accretion and land sinking in the core zone of the National Park. The measurement shows the average sedimentation rate of 2.9 cm / yr and the sinking rate of 3.4 cm / yr, since Dec. 30th 2012. This is the first ground-based observation of shallow subsidence under mangroves in the Tonkin Gulf. As a simple and low cost method, so further expansion of this monitoring could provide more useful information to help identify the generally sinking trend of coastal areas in the Red River Delta and also to protect its own biosphere reserve.

Download Full-text