成都理工大学学报（自然科学版）2026，Vol.53Issue(3)：570-583,14.DOI:10.12474/cdlgzrkx.2024011903
珠江口盆地始新世—渐新世古环境演化及对冰期事件的响应
Eocene-Oligocene paleoenvironmental evolution and response to glacial events in the Pearl River Mouth Basin
摘要
Abstract
The Eocene-Oligocene climate experienced a temperature plunge event,which was global and accompanied by various significant environmental changes.As the formation of source rocks is often restricted by paleoclimate conditions,it is important for oil and gas exploration to ascertain the relationship between source rock formation and EOGM-type events.This research takes Eocene-Oligocene TOC data and changes of pollen and algae as the research content,to recover the Eocene-Oligocene paleoclimate changes in the Pearl River Mouth Basin.To this aim,we explore the coupling relationship between Eocene-Oligocene ice age events and basin climate,providing paleoclimatic evidence that supports oil and gas exploration in the basin.It was found that TOC data of the PY28-X1,EP21-X2,HZ20-X3,KP10-X4,and KP11-X5 wells have an obvious downward tendency near the Eocene-Oligocene boundary.A pollen study shows that the content of thermophilic pollen;i.e.,Quercoidites minutus,in the BY7-X6,BY13-X7,and LH29-X8 wells had an obvious downward tendency near the Eocene-Oligocene boundary.The pollen assemblages in the Oligocene Zhuhai Formation are dominated by temperate tree species,such as Alnipollenites,Momipites,and Pinuspollenites,which indicate that the climate of the Oligocene was cold.Finally,the paleoclimate and paleoenvironmental evolution from the Eocene to Oligocene in the Pearl River Mouth Basin are recovered,which allowed us to conduct a comparative analysis of the paleoclimate of major oil-gas-producing basins in offshore China in relation to global climate changes.The results show that there was an abrupt temperature decline in the Pearl River Mouth Basin and other major basins near the Eocene-Oligocene boundary,likely due as a response to the EOGM event.This abrupt drop corresponds to a decrease in TOC,indicating that EOGM-type events are not conducive to the formation of source rocks.关键词
始新世—渐新世/古气候/EOGM/珠江口盆地/烃源岩Key words
Eocene-Oligocene/paleoclimate/EOGM/Pearl River Mouth Basin/source rocks分类
天文与地球科学引用本文复制引用
王月,常晓琳,陈莹,王文楷,刘欣春,钟瀚霆,魏冰,戚晓婧,侯明才..珠江口盆地始新世—渐新世古环境演化及对冰期事件的响应[J].成都理工大学学报（自然科学版）,2026,53(3):570-583,14.基金项目
中海石油有限公司科研项目(YXKY-ZX012021) （YXKY-ZX012021）
国家自然科学基金面上项目(42272023). （42272023）
