Diagenesis and reservoir quality of sandstones in the Eocene Shahejie Formation, Raoyang Sag (Jizhong Depression), Bohai Bay Basin, China

2020 ◽  
Vol 55 (4) ◽  
pp. 2787-2804
Author(s):  
Kaixun Zhang ◽  
Guoping Bai ◽  
Li Liu ◽  
Hongxia Wang ◽  
Zengqiang Guo ◽  
...  
Keyword(s):  
Reservoir Quality ◽  
Bohai Bay ◽  
Bohai Bay Basin ◽  
Shahejie Formation ◽  
Jizhong Depression

scholarly journals Diagenetic facies and reservoir porosity evaluation of deep high-quality clastic reservoirs: A case study of the Paleogene Shahejie Formation, Nanpu Sag, Bohai Bay Basin, China

2021 ◽  
pp. 014459872199850
Author(s):  
Jiaqi Yang ◽  
Enze Wang ◽  
Youliang Ji ◽  
Hao Wu ◽  
Zhiliang He ◽  
...  
Keyword(s):  
Thin Section ◽  
Analysis Data ◽  
Reservoir Quality ◽  
Bohai Bay ◽  
Bohai Bay Basin ◽  
Porosity Reduction ◽  
Shahejie Formation ◽  
Nanpu Sag ◽  
Diagenetic Facies

Petrological analysis, thin-section observation and laboratory analysis data were selected to systematically study the physical and diagenetic features of the first member of the Paleogene Shahejie Formation (Es1) in the No. 3 structural belt of the Nanpu Sag, Bohai Bay Basin. The intensities of different diagenetic processes were determined, the diagenetic evolution sequence was reconstructed, the typical diagenetic facies were identified and the effects of different diageneses on the reservoir were quantitatively analyzed. The results show that the main intergranular fillings include authigenic-quartz, quartz secondary enlargement, clay minerals, carbonate cement and matrix. The pore types include intergranular porosity, dissolution porosity and microfractures. The reservoir has experienced compaction, early cementation, dissolution and late cementation, among which compaction is the most important porosity reducer. Compaction was the main diagenetic process involved in porosity reduction, accounting for about 24.4% of the loss of thin-section porosity. The dissolution process clearly improved the porosity, increasing thin-section porosity by 2.7%. Five diagenetic facies were identified on the basis of petrographic analyses, namely, (a) strongly compacted-weakly cemented-weakly dissolved facies; (b) weakly compacted-strongly cemented-weakly dissolved facies; (c) moderately compacted-moderately cemented-weakly dissolved facies; (d) strongly compacted-weakly cemented-moderately dissolved facies; and (e) strongly compacted-weakly cemented-strongly dissolved facies. According to the analysis of diagenesis intensity, the porosity evolution model of various diagenetic facies was reconstructed, and the reservoir quality of various diagenetic facies was quantitatively predicted. The reservoir quality of different diagenetic facies clearly changed with depth. The best reservoir quality was in strongly compacted–weakly cemented–strongly dissolution facies, which have good sorting, contain a large amount of feldspar and soluble debris, and are mainly developed in the main part of the river channel. Our study can provide a reference for the subsequent exploration and development of deep petroleum systems.

Rock Types and Reservoir Characteristics of Shahejie Formation Marl in Shulu Sag, Jizhong Depression, Bohai Bay Basin

2021 ◽  
Vol 32 (4) ◽  
pp. 986-997
Author(s):  
Jingwei Cui ◽  
Xuanjun Yuan ◽  
Songtao Wu ◽  
Ruifeng Zhang ◽  
Song Jin ◽  
...  
Keyword(s):  
Bohai Bay ◽  
Bohai Bay Basin ◽  
Reservoir Characteristics ◽  
Rock Types ◽  
Shulu Sag ◽  
Shahejie Formation ◽  
Jizhong Depression

Sequence stratigraphy, sedimentary facies and reservoir quality of Es4s, southern slope of Dongying Depression, Bohai Bay Basin, East China

2016 ◽  
Vol 77 ◽  
pp. 448-470 ◽  
Author(s):  
Muhammad Aleem Zahid ◽  
Dong Chunmei ◽  
Chengyan Lin ◽  
Jon Gluyas ◽  
Stuart Jones ◽  
...  
Keyword(s):  
Sequence Stratigraphy ◽  
Sedimentary Facies ◽  
East China ◽  
Reservoir Quality ◽  
Bohai Bay ◽  
Southern Slope ◽  
Bohai Bay Basin ◽  
Dongying Depression
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