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Geofluids
Volume 2017, Article ID 4358985, 32 pages
https://doi.org/10.1155/2017/4358985
Research Article

Reconstruction of the Cenozoic History of Hydrocarbon Fluids from Rifting Stage to Passive Continental Margin Stage in the Huizhou Sag, the Pearl River Mouth Basin

1School of Marine Sciences, China University of Geosciences, Beijing 100083, China
2School of Energy Resources, China University of Geosciences, Beijing 100083, China
3Energy and Geoscience Institute, University of Utah, Salt Lake City, UT 84108, USA
4Beijing Ultron Era Scientific Co., Ltd., Beijing 100080, China

Correspondence should be addressed to Shu Jiang; ude.hatu.ige@gnaijs and Zhenglong Jiang; nc.ude.bguc@lzgnaij

Received 5 May 2017; Revised 28 August 2017; Accepted 3 October 2017; Published 21 November 2017

Academic Editor: Stefano Lo Russo

Copyright © 2017 Yajun Li et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The Eocene lacustrine sediments are the primary source rocks in the Huizhou Sag of the Pear River Mouth Basin. This study employs basin modeling for four representative wells and two profiles in the Huizhou Sag to reconstruct the process of generation, expulsion, migration, and accumulation of hydrocarbon fluids. The Eocene source rocks started to generate hydrocarbon at 33.9 Ma and are currently in a mid-mature and postmature stage. Hydrocarbons are mainly expelled from the Eocene Wenchang Fm, and the contribution of the Eocene Enping formation is minor. Under the driving forces of buoyancy and excess pressure, major hydrocarbons sourced from the Eocene source rocks firstly migrated laterally to the adjacent Eocene reservoirs during the postrift stage, then vertically via faults to Oligo-Miocene carrier beds, and finally laterally to the structural highs over a long distance during the Pliocene-Quaternary Neotectonic stage, which is controlled by both structural morphology and heterogeneity of carrier beds. Fault is the most important conduit for hydrocarbon fluid migration during the Neotectonic stage. Reactivation of previous faults and new-formed faults caused by the Dongsha Movement (9.8–4.4 Ma) served as vertical migration pathways after 10.0 Ma, which significantly influenced the timing of hydrocarbon accumulation in the postrift traps.