scholarly journals Coupling between Diagenetic Environment and Porosity Evolution—A Quantitative Study of the Zhuhai Formation in the Huizhou Sag, Pearl River Mouth Basin, South China Sea

Minerals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 170
Author(s):  
Xuan Cao ◽  
Dakang Zhong ◽  
Jie Liu ◽  
Haitao Sun ◽  
Zezhang Song ◽  
...  
Keyword(s):  
River Mouth ◽  
Fluorescence Analysis ◽  
Reservoir Quality ◽  
Burial Depth ◽  
Pearl River Mouth Basin ◽  
Weakly Alkaline ◽  
Porosity Evolution ◽  
Deep Faults ◽  
Diagenetic Environment

The diagenetic environment is vital in controlling reservoir quality by influencing diagenetic processes, especially porosity evolution. The Zhuhai Formation is a critical exploration target in the Huizhou Sag. However, there are considerable differences between the reservoirs in the west (Huixi) and east (Huidong) Huizhou Sag with only a 400 m difference in burial depth. To investigate causes of these differences, scanning electron microscopy (SEM), cathodoluminescence analysis, fluorescence analysis, and fluid inclusion analysis are employed for the petrological and diagenetic characterization of the target formation. Moreover, image analysis software is used to qualitatively evaluate the impacts of diagenesis on porosity. The results show that the digenetic environments in Huixi and Huidong are different. Huixi is characterized by a high content of feldspar with a stronger dissolution phenomenon than that observed in Huidong. The main cement types in Huixi are siliceous cement and kaolinite. Moreover, Huixi had a low palaeo-temperature, low palaeo-salinity, and low palaeo-pH diagenetic environment. In contrast, Huidong is accessible via deep faults and rich in lithic fragments which show visible deformation. Moreover, cements in this area include carbonate, gypsum, quartz overgrowth, kaolinite, and chlorite. This evidence confirms that the diagenetic environment in Huidong was a high palaeo-temperature and high palaeo-salinity environment with high palaeo-pH. Additionally, the palaeo-pH evolved following the sequence of weakly alkaline, acidic, alkaline and acidic. Microscopy evidence indicates that the Dongsha Uplift was a likely source of Huixi sediments during the deposition of the Zhuhai Formation. The determination of the porosity evolution shows that compaction and lithic fragment content are the main controlling factors on the reservoir quality of the Zhuhai Formation.

scholarly journals Impact of Temperature and Geothermal Gradient on Sandstone Reservoir Quality: the Baiyun Sag in the Pearl River Mouth Basin Study Case (Northern South China Sea)

Minerals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 452 ◽  
Author(s):  
Chuan Lei ◽  
Jinglan Luo ◽  
Xiong Pang ◽  
Chi Li ◽  
Jiang Pang ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Northern South China Sea ◽  
River Mouth ◽  
Geothermal Gradient ◽  
Pearl River ◽  
Reservoir Quality ◽  
Pearl River Mouth Basin ◽  
Porosity And Permeability ◽  
The Pearl River

Deep-water areas have become a hotspot for global hydrocarbon exploration. In the deep-water area of the Northern South China Sea, a complete set of source rocks, reservoir rocks, and caprock represents a good oil and gas exploration prospect. The Pearl River Mouth basin, an important exploration target in this area, has a wide range of geothermal gradients. However, the mechanism by which the geothermal gradient influences reservoir quality remains unclear, which severely restricts future exploration. We observed that the reduction rates in the porosity and permeability with increasing burial depth and stratum temperature are more rapid in high geothermal gradient areas. The stratum temperature affects the process of diagenesis and the reservoir quality by changing the grain compressive strength, solubility, and precipitation of minerals and clay minerals transformations. With a comparison the crustal extensional thinning histories of different geothermal gradient areas, this study elucidates the comprehensive factors controlling the decreases rates of reservoir porosity and permeability. These findings explain the different evolutions of reservoirs in areas with different geothermal gradients.

scholarly journals Chlorite cement and its effect on the reservoir quality of sandstones from the Panyu low-uplift, Pearl River Mouth Basin

2011 ◽  
Vol 8 (2) ◽  
pp. 143-150 ◽  
Author(s):  
Guojun Chen ◽  
Guichao Du ◽  
Gongcheng Zhang ◽  
Qi Wang ◽  
Chengfu Lv ◽  
...  
Keyword(s):  
River Mouth ◽  
Pearl River ◽  
Reservoir Quality ◽  
Pearl River Mouth Basin

Sorption of Se (IV) from aqueous solutions with subsequent determination by X-ray fluorescence analysis

2020 ◽  
Vol 86 (10) ◽  
pp. 5-9
Author(s):  
D. G. Filatova ◽  
A. A. Arkhipenko ◽  
M. A. Statkus ◽  
V. V. Es’kina ◽  
V. B. Baranovskaya ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
Fluorescence Analysis ◽  
Standard Samples ◽  
Phase Contact Time ◽  
Sorbent Phase ◽  
X Ray ◽  
Fundamental Parameters ◽  
Inductively Coupled ◽  
Subsequent Determination

An approach to sorptive separation of Se (IV) from solutions on a novel S,N-containing sorbent with subsequent determination of the analyte in the sorbent phase by micro-x-ray fluorescence method is presented. The sorbent copolymethylenesulfide-N-alkyl-methylenamine (CMA) was synthesized using «snake in the cage» procedure and proven to be stable in acid solutions. Conditions for quantitative extraction of Se (IV) were determined: sorption in 5 M HCl or 0.05 M HNO3 solutions when heated to 60°C, phase contact time being 1 h. The residual selenium content in the solution was determined by inductively coupled plasma mass spectrometry (ICP-MS) using 82Se isotope. The absence of selenium losses is proved and the mechanism of sorption interaction under specified conditions is proposed. The method of micro-x-ray fluorescence analysis (micro-RFA) with mapping revealed a uniform distribution of selenium on the sorbent surface. The possibility of determining selenium in the sorbent phase by micro-RFA is shown. When comparing the obtained results with the results of calculations by the method of fundamental parameters, it is shown the necessity of using standard samples of sorbates to obtain correct results of RFA determination of selenium in the sorbent phase.

Structural Characteristics and its Significances on Hydrocarbon Accumulation in the Yunkai Low Uplift, Pearl River Mouth Basin

2021 ◽  
Vol 95 (1) ◽  
pp. 21-29
Author(s):  
Yixin YU ◽  
Tianlong ZHANG ◽  
Zhongtao ZHANG ◽  
Gongcheng ZHANG ◽  
Jianhui ZENG ◽  
...  
Keyword(s):  
Structural Characteristics ◽  
River Mouth ◽  
Pearl River ◽  
Pearl River Mouth Basin ◽  
Hydrocarbon Accumulation

Determination of the composition of binary chalcogenide glasses by X-ray fluorescence analysis

2010 ◽  
Vol 44 (1) ◽  
pp. 24-27 ◽  
Author(s):  
G. A. Bordovsky ◽  
A. V. Marchenko ◽  
P. P. Seregin ◽  
N. N. Smirnova ◽  
E. I. Terukov
Keyword(s):  
Chalcogenide Glasses ◽  
Fluorescence Analysis ◽  
X Ray
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