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Material Exchange and Migration between Pore Fluids and Sandstones during Diagenetic Processes in Rift Basins: A Case Study Based on Analysis of Diagenetic Products in Dongying Sag, Bohai Bay Basin, East China
Joint Authors
Zeng, Jianhui
Meng, W.
Cao, Z.
Song, G. Q.
Wang, Y. S.
Teng, J. L.
Guo, Z.
Source
Issue
Vol. 2018, Issue 2018 (31 Dec. 2018), pp.1-20, 20 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2018-02-15
Country of Publication
Egypt
No. of Pages
20
Main Subjects
Abstract EN
The exchange and migration of basin materials that are carried by pore fluids are the essence of diagenesis, which can alter physical properties of clastic rocks as well as control formation and distribution of favorable reservoirs of petroliferous basins.
Diagenetic products and pore fluids, resulting from migration and exchange of basin materials, can be used to deduce those processes.
In this study, 300 core samples from 46 wells were collected for preparation of casting thin sections, SEM, BSE, EDS, inclusion analysis, and isotope analysis in Dongying Sag, Bohai Bay Basin, East China.
Combined with geochemical characteristics of pore fluids and geological background of the study area, the source and exchange mechanisms of materials in the pore fluids of rift basins were discussed.
It was revealed that the material exchange of pore fluids could be divided into five stages.
The first stage was the evaporation concentration stage during which mainly Ca2+, Mg2+, and CO32- precipitated as high-Mg calcites.
Then came the shale compaction stage, when mainly Ca2+ and CO32- from shale compaction water precipitated as calcites.
The third stage was the carboxylic acid dissolution stage featured by predominant dissolution of plagioclases, during which Ca2+ and Na+ entered pore fluids, and Si and Al also entered pore fluids and then migrated as clathrates, ultimately precipitating as kaolinites.
The fourth stage was the organic CO2 stage, mainly characterized by the kaolinization of K-feldspar as well as dissolution of metamorphic lithic fragments and carbon cements.
During this stage, K+, Fe2+, Mg2+, Ca2+, HCO3-, and CO32- entered pore fluids.
The fifth stage was the alkaline fluid stage, during which the cementation of ferro-carbonates and ankerites as well as illitization or chloritization of kaolinites prevailed, leading to the precipitation of K+, Fe2+, Mg2+, Ca2+, and CO32- from pore fluids.
American Psychological Association (APA)
Meng, W.& Zeng, Jianhui& Cao, Z.& Song, G. Q.& Wang, Y. S.& Teng, J. L.…[et al.]. 2018. Material Exchange and Migration between Pore Fluids and Sandstones during Diagenetic Processes in Rift Basins: A Case Study Based on Analysis of Diagenetic Products in Dongying Sag, Bohai Bay Basin, East China. Geofluids،Vol. 2018, no. 2018, pp.1-20.
https://search.emarefa.net/detail/BIM-1157189
Modern Language Association (MLA)
Meng, W.…[et al.]. Material Exchange and Migration between Pore Fluids and Sandstones during Diagenetic Processes in Rift Basins: A Case Study Based on Analysis of Diagenetic Products in Dongying Sag, Bohai Bay Basin, East China. Geofluids No. 2018 (2018), pp.1-20.
https://search.emarefa.net/detail/BIM-1157189
American Medical Association (AMA)
Meng, W.& Zeng, Jianhui& Cao, Z.& Song, G. Q.& Wang, Y. S.& Teng, J. L.…[et al.]. Material Exchange and Migration between Pore Fluids and Sandstones during Diagenetic Processes in Rift Basins: A Case Study Based on Analysis of Diagenetic Products in Dongying Sag, Bohai Bay Basin, East China. Geofluids. 2018. Vol. 2018, no. 2018, pp.1-20.
https://search.emarefa.net/detail/BIM-1157189
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1157189