Sedimentary facies of the central part of radial tidal sand ridge system of the eastern China coast

2008 ◽  
Vol 2 (4) ◽  
pp. 408-417 ◽  
Author(s):  
Yong Yin ◽  
Xinqin Zou ◽  
Dakui Zhu ◽  
Jiaxiang Huang
Keyword(s):  
Eastern China ◽  
Sedimentary Facies ◽  
Sand Ridge ◽  
Tidal Sand ◽  
China Coast ◽  
Ridge System

Predictive distribution of high-quality tight reservoirs of coarse clastic rocks by linking diagenesis to sedimentary facies: Evidence from the upper Sha 4 Member in the northern Bonan Sag, Bohai Bay Basin, eastern China

2018 ◽  
Vol 6 (2) ◽  
pp. T413-T429 ◽  
Author(s):  
Dong Wu ◽  
Xiantai Liu ◽  
Yushan Du ◽  
Long Jiang ◽  
Ziyan Cheng
Keyword(s):  
Eastern China ◽  
Sedimentary Facies ◽  
Middle Part ◽  
Bohai Bay ◽  
Bohai Bay Basin ◽  
High Quality ◽  
Clastic Rocks ◽  
Bonan Sag ◽  
Tight Reservoirs ◽  
Channel Deposits

Coarse clastic rocks of the upper Sha 4 Member in the northern Bonan Sag of the Bohai Bay Basin in eastern China are important hydrocarbon reservoirs. The deposits are tight reservoirs owing to the low porosity (less than 10%) and low permeability (less than 1 mD). Because of the strong heterogeneity, although the reserve in the northern Bonan Sag is remarkable, only 4.9% of the reserves are recovered. We have studied these tight reservoirs by linking diagenesis to sedimentary facies to help predict the distribution of high-quality tight reservoirs. Petrographic analysis is undertaken based on cores, thin sections, X-ray diffraction and scanning electron microscope, helpful to understand the impacts on tight reservoirs of sedimentary factors and diagenesis factors. Sedimentary microfacies, lithologic characteristics, reservoir property, diagenesis, and diagenetic minerals are studied. Coarse clastic rocks are deposited mainly in nearshore subaqueous fans and fan deltas. The multistage sandstones are the valid reservoirs of coarse clastic rocks and dominated by feldspathic litharenite, lithic arkose, and arkose. The reservoir property is poor principally owing to the strong compaction and cementation. Pores are composed of secondary pores and primary pores. The secondary pore, generated in the dissolution of detrital minerals and/or cements, is the major type of pores and important to porosity improvement. By linking diagenesis to sedimentary facies, it can be concluded that high-quality tight reservoirs of coarse clastic rocks of the upper Sha 4 Member in the northern Bonan Sag of Bohai Bay Basin in eastern China are associated with medium to coarse-grain sandstones, found in the middle part of underwater distributary channel deposits in fan deltas and in the middle part of underwater channel deposits in nearshore subaqueous fans, with abundant secondary porosity but low cement contents, vertically at depths ranging from 3500 to 4100 m.

14C GEOCHRONOLOGY AND RADIOCARBON RESERVOIR EFFECT OF REVIEWED LAKES STUDY IN CHINA

Radiocarbon ◽  
2021 ◽  
pp. 1-12
Author(s):  
Weijian Zhou ◽  
Yuda Chui ◽  
Ling Yang ◽  
Peng Cheng ◽  
Ning Chen ◽  
...  
Keyword(s):  
Environmental Changes ◽  
Piecewise Linear ◽  
Eastern China ◽  
Lacustrine Sediments ◽  
Sedimentary Facies ◽  
Northwest China ◽  
Tibet Plateau ◽  
Dominant Factor ◽  
Climatic Regions ◽  
Reservoir Age

ABSTRACT Lacustrine sediments are important archives for paleoclimate research, but there are evident carbon reservoir effects. Radiocarbon (14C) ages of lake sediments must be corrected for these effects before applying them to paleoclimate research. The authors review the lacustrine research from the last 20 years from different climatic regions in China, and systematically investigate the 14C age and correction methods used in the studies of 81 lakes. It is found that the climate-vegetation cover and distribution of carbonate around lakes are dominant factor controlling radiocarbon reservoir effects. In eastern China, the average 14C reservoir age is about 500 14C years and is associated with relatively dense vegetation. However, in northwest China and Qinghai-Tibet Plateau, widespread carbonate bedrock may markedly increase the radiocarbon reservoir age which frequently is about 1500 and 2500 14C years. A piecewise linear regression model provides more reliable 14C reservoir age correction that accounts for sedimentary facies and sedimentation rate changes. It is worth mentioning that when analyzing 14C ages deviated greatly from time sequence, the age anomalies may indicate important effects relevant to the study of climate and environmental changes.

Sedimentary facies and evolution in the Qiantang River incised valley, eastern China

2005 ◽  
Vol 219 (4) ◽  
pp. 235-259 ◽  
Author(s):  
Chun-Ming Lin ◽  
Hong-Chun Zhuo ◽  
Shu Gao
Keyword(s):  
Eastern China ◽  
Sedimentary Facies ◽  
Incised Valley ◽  
Qiantang River

Types and Acoustic Reflection Characteristics of Geo-Hazards in the Western of the North Yellow Sea

2011 ◽  
Vol 137 ◽  
pp. 374-381
Author(s):  
Xiao Hui Chen ◽  
Xun Hua Zhang ◽  
Ri Hui Li
Keyword(s):  
Yellow Sea ◽  
Research Progress ◽  
Sand Wave ◽  
Sand Ridge ◽  
Engineering Construction ◽  
Acoustic Reflection ◽  
North Yellow Sea ◽  
The North ◽  
Tidal Sand ◽  
Marine Engineering

The geological environments in the western of the North Yellow Sea(NYS) are comparatively complicated and pregnant with various geo-hazards. High-resolution sub-bottom seismic data and previous research progress have been used to examine marine geo-hazards’ types, acoustic reflection features, origins and disaster mechanisms. The results indicate that the hazardous types are complicated and multiple in the western of the NYS, including tidal sand ridge, sand wave, tidal erosion gutter, underwater shoal, shallow gas, buried paleo-channel, active fault, irregular bedrock and so on. They have some connections as well as differentiations in their distribution and genesis. This paper can provide the theoretical basis on marine engineering, disaster prevention and mitigation in the western of the NYS . More attention should be given to severe geo-hazards that can constitute direct or potential hazards to the economic development and engineering construction.

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