Tectonic-thermal history and hydrocarbon potential of the Pearl River Mouth Basin,northern South China Sea:Insights from borehole apatite fission-track thermochronology  

作　　者：Xiao-yin Tang Shu-chun Yang Sheng-biao Hu 

机构地区：[1]Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,China [2]Key Laboratory of Petroleum Geomechanics,China Geological Survey,Beijing 100081,China [3]Key Laboratory of Paleomagnetism and Tectonic Reconstruction,Ministry of Natural Resources,Beijing 100081,China [4]CNOOC Research Institute,Beijing 100028,China [5]State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China

出　　处：《China Geology》2023年第3期429-442,共14页中国地质（英文）

基　　金：This study is financially supported by the National Natural Science Foundation of China(42072181).

摘　　要：The Pearl River Mouth Basin(PRMB)is one of the most petroliferous basins on the northern margin of the South China Sea.Knowledge of the thermal history of the PRMB is significant for understanding its tectonic evolution and for unraveling its poorly studied source-rock maturation history.Our investigations in this study are based on apatite fission-track(AFT)thermochronology analysis of 12 cutting samples from 4 boreholes.Both AFT ages and length data suggested that the PRMB has experienced quite complicated thermal evolution.Thermal history modeling results unraveled four successive events of heating separated by three stages of cooling since the early Middle Eocene.The cooling events occurred approximately in the Late Eocene,early Oligocene,and the Late Miocene,possibly attributed to the Zhuqiong II Event,Nanhai Event,and Dongsha Event,respectively.The erosion amount during the first cooling stage is roughly estimated to be about 455-712 m,with an erosion rate of 0.08-0.12 mm/a.The second erosion-driven cooling is stronger than the first one,with an erosion amount of about 747-814 m and an erosion rate between about 0.13-0.21 mm/a.The erosion amount calculated related to the third cooling event varies from 800 m to 3419 m,which is speculative due to the possible influence of the magmatic activity.

关 键 词：Oil and gas Hydrocarbon potential Apatite fission-track Tectonic-thermal evolution Thermal history modeling Cooling event Heating event Marine geological survey engineering Erosion amount and rate Oil-gas exploration engineering Pearl River Mouth Basin The South China Sea 

分 类 号：P618.13[天文地球—矿床学]