AUTHOR=Yang Bing , Fu Qiang , Liu Jinshui , Ma Wenrui , Zhao Shijie 

TITLE=Study on fault sealing of the Lishui West Sag in the East China Sea Basin

JOURNAL=Frontiers in Earth Science

VOLUME=Volume 10 - 2022

YEAR=2023

URL=https://www.frontiersin.org/journals/earth-science/articles/10.3389/feart.2022.1012324

DOI=10.3389/feart.2022.1012324

ISSN=2296-6463

ABSTRACT=The property of fault sealing is a critical controlling factor for hydrocarbon transportation. However, the sealing property of the complex fault system in Lishui West Sag is still not clear, which is essential to study the regional hydrocarbon transportation and reservoir formation.
In this paper, we use an integrated method to quantitatively analyze and characterize several important index parameters that affect the sealing property of the faults in Lishui West Sag based on regional logs and seismic data. We calculated the shale smear factor (SSF), shale gouge ratio (SGR), as well as clay smear potential (CSP) in order to characterize the lateral sealing property of main faults covered with the giant-thick shale cap in Lishui West Sag. We used vertical shale smear factor Q to clarify the vertical sealing property of these faults quantitatively as a comparison. The results show that the shale cap has a strong smear ability in Lishui West Sag, while the active fault could moderate the smear. A high fault activity in this area benefits hydrocarbon transportation at the same time. The lateral sealing property and the vertical sealing property of the main faults in Lishui West Sag have negative correlations.