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AAPG Bulletin, Preliminary version published online Ahead of Print 1 October 2022.

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Secondary porosity generation in sandstones constrained by the fault movement, fluid flow and mudstone/sandstone interactions, offshore Bohai Bay Basin, China

Huan Li12 , Xiaofeng Du2 , Xianghua Yang3 , and Hongtao Zhu3

1 School of Geography, Earth and Atmospheric Sciences, University of Melbourne, Victoria 3010, Australia
2 China National Offshore Oil Corporation Limited, Tianjin Branch, Tianjin 300459, China
3 Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China

Ahead of Print Abstract

This work examined the influences of fault movement, induced fluid flow and thermal mudstone evolution on the secondary porosity generation and diagenesis in Eocene – Miocene sandstones from the Western Bozhong Depression, offshore Bohai Bay Basin, using quantitative petrographic analyses, stable isotopes, quantitative fluorescence and quantitative evaluations of fault movement, seal and fluid flow. Mudstones at shallow, moderate and deep depths have different capacities in providing organic acids/CO2 for mineral dissolution and ions for the precipitation of carbonate cements in adjacent sandstones. Moderate and deep mudstones are mature and able to provide organic acids/CO2 and other ions to adjacent sandstones. However, shallow mudstones are not mature and have limited mass supply capacity. Subsequent fault movement activates fluid migration, resulting in the redistribution of organic acids/CO2 (including naphthenic acid/CO2 from hydrocarbon biodegradation), the acceleration of secondary porosity generation and the export of by-products. Under the joint influences of thermal mudstone maturity and fault movement induced fluid flow, organic acids/CO2 could have been sourced from adjacent mudstone (internal source; deep model; >2500 m), transported from deep formations through faults (external source; shallow model;

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Please cite this AAPG Bulletin Ahead of Print article as:

Huan Li , Xiaofeng Du , Xianghua Yang , Hongtao Zhu: Secondary porosity generation in sandstones constrained by the fault movement, fluid flow and mudstone/sandstone interactions, offshore Bohai Bay Basin, China, (in press; preliminary version published online Ahead of Print 01 October 2022: AAPG Bulletin, DOI:10.1306/09232220024.