Hydrocarbon Charging Orders and Times in the Eastern Area of Qiongdongnan Basin

Abstract

Abstract:

In this paper，37 fluid inclusion samples from 6 wells in the eastern area of Qiongdongnan Basin have been employed to systematically obtain information including the observation of fluorescence colors and the measurement of homogenization temperatures, and the results indicate that there are four phases of thermal fluid flow relative to hydrocarbon chargings in the area. Integrated the average homogenization temperatures with burial historical curves, this paper concluded that the charging orders respectively correspond to 20-18 Ma(Early Miocene), 10-6.5 Ma (Late Miocene), 5.5-2 Ma (Pliocene) and 2-0 Ma (Quaternary). In those periods, Pliocene and Quaternary are the primary stages of hydrocarbon charging. The first period fluid is mature thermogenic gas, the second one is low mature oil and gas, the third one is moderate and high mature gas and lease condensate, and the fourth one is maturehigh mature gas accompanying a little mature light oil. Furthermore, mantlesource carbon dioxide has charged in local area since Middle Miocene (14 Ma), which hindered hydrocarbon migration and accumulation in late-stage.

Key words: Qiongdongnan Basin, fluid inclusion, hydrocarbon charging order and time

CLC Number:

TE122.1

LIU Zheng-Hua,CHEN Hong-Han. Hydrocarbon Charging Orders and Times in the Eastern Area of Qiongdongnan Basin[J]. Geoscience, 2011, 25(2): 279-288.

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