Characteristics and Evolutionary History of Overpressure in Panyu 4 Sag, Pearl River Mouth Basin

• 责任者：ZHhang Yang (Graduate School of China University of Geosciences) ; Ye Jiaren
• 刊名：Marine Geology & Quaternary Geology
• 出版年：2010
• 卷期：30(4)
• 关键词：超压 ; overpressure ; 油气藏形成 ; reservoir formation ; 珠江口盆地 ; Zhujiangkou Basin
• 页码：p.171-177
• 图表：8 illus., 1 table, 16 refs.
• 分类号：1003
• issnNo：ISSN0256-1492
• isbnNo：CN37-1117/P

This paper confirms the existence of overpressure in the Panyu-4 sag, Pearl River Mouth Basin based on logging, drilling, geological and geochemical data, discusses its forming mechanism, divides the area of overpressure, and reconstructs pressure evolution process in a two-dimensional framework. It suggests that overpressure, which is mainly controlled by lithology, exists widely in Panyu-4 sag. Its forming mechanism includes both hydrocarbon generation and the compaction disequilibrium. The history of pressure evolution is complex. Overpressure in Wenchang Formation includes two stages: the early stage is due to compaction disequilibrium, and the later stage is related to hydrocarbon generation since 15 Ma.