Accumulation period of Yongle 10-6 Structure in the southern step-fault zone， Baodao Sag of Qiongdongnan Basin

JIANG Zhonghui, HU Lin, LIU Xianfeng, HE Xiaohu, YUAN Feifei, GAN Jun, FENG Yong

Journal of Marine Sciences ›› 2026, Vol. 44 ›› Issue (2) : 51-64.

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Journal of Marine Sciences ›› 2026, Vol. 44 ›› Issue (2) : 51-64. DOI: 10.3969/j.issn.1001-909X.2026.02.006

Accumulation period of Yongle 10-6 Structure in the southern step-fault zone， Baodao Sag of Qiongdongnan Basin

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The Qiongdongnan Basin， a Cenozoic petroliferous basin in the northern South China Sea， is rich in deepwater hydrocarbon resources and represents a critical frontier for Chinese offshore exploration. This study integrated core samples， well logging data， and analytical techniques including fluid inclusion petrography， oil inclusion abundance （GOI） analysis， and homogenization temperature measurements from four wells （W1-W4） targeting the Lingshui Formation in the Yongle 10-6 Structure. Burial-thermal history modeling combined with hydrocarbon generation evolution and fault activity analysis were employed to reconstruct hydrocarbon charging episodes and accumulation processes. The results showed that three distinct inclusion types were identified in Member 3 of the Lingshui Formation： liquid oil inclusions， single CH4 gas inclusions， and CO2-bearing aqueous inclusions. Blue fluorescence of oil inclusions indicated a high-maturity oil charging. GOI values of 1.23% （W2） and 3.5% （W3） suggested the study intervals served as hydrocarbon migration pathways. Three hydrocarbon charging episodes were constrained： Early Miocene （20.9-17.2 Ma）， Late Miocene （10.2-7.6 Ma）， Pliocene to present （5.0-0.0 Ma）. Among them， oil-dominated charging occurred in the Early Miocene and Pliocene， whereas gas-dominated charging prevailed in the Late Miocene and Pleistocene. Since the Pleistocene （2.0 Ma）， mantle-derived CO2 charging had been ongoing and continued to the present. Spatially， hydrocarbon charging occurred earlier in northern structural belt （W1， W2） than that in southern structure belt （W3， W4）. While CH4 and CO2 charging were recorded in all four wells， oil accumulation was observed only in W2 and W3 with relatively high-maturity. The Baodao Sag exhibited two-phase hydrocarbon generation from source rocks. Early fault activity （later ceasing） resulted in differential accumulation characterized by early oil and late gas charging， earlier accumulation in the north and later in the south， and multi-stage accumulation. This work delineates the hydrocarbon charging phases in the less-explored Baodao Sag of the Qiongdongnan Basin， reconstructs the hydrocarbon accumulation history， and provides guiding significance for predicting future exploration targets.

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fluid inclusions / Raman measurement / fluorescence spectrum / hydrocarbon charging history / hydrocarbon accumulation / Lingshui Formation / Yongle10-6 / Qiongdongnan Basin

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JIANG Zhonghui , HU Lin , LIU Xianfeng , et al . Accumulation period of Yongle 10-6 Structure in the southern step-fault zone， Baodao Sag of Qiongdongnan Basin[J]. Journal of Marine Sciences. 2026, 44(2): 51-64 https://doi.org/10.3969/j.issn.1001-909X.2026.02.006

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