Oil & Gas Geology ›› 2006, Vol. 27 ›› Issue (1): 33-36.doi: 10.11743/ogg20060106

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Analysis of hydrocarbon migration stages in the 8 th member of Yanchang Fm in Xifeng oilfield

Wu Minghui1, Zhang Liuping1, Luo Xiaorong1, Mao Minglu2, Yang Yang2   

  1. 1. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;
    2. Research Institute of Exploration and Development, Changqing Oilfield Company, PetroChina, Xi'an, Shaanxi 710021, China
  • Received:2005-12-19 Online:2006-02-25 Published:2012-01-16

Abstract:

In combination with the evolutionary process simulation of burial history and geothermal history of Xifeng oilfield in Ordos basin, microfluorometric technology and microscopic thermometry technology of inclusion have been applied in the study, which indicates that hydrocarbon migration in the study area has mainly occurred in two stages. The first migration stage occurred in the Middle and Late Jurassic, while the second migration stage occurred at the end of Early Cretaceous, which was a critical period of Mesozoic hydrocarbon migration and accmulation in Xifeng area, Ordos basin. The first and second stages of hydrocarbon migration correspond to the early diagenetic stage B and the late diagenetic stage A, respectively. Since the brine inclusions in the area have mainly been formed in quartz fractures, the preservation conditions of inclusions are relatively poor, leading to a certain interpretation ambiguity of the homogenization temperatures. The screening principle of applying thermometric data of fluid inclusions met in the fractures has, therefore, been made, which can be used as reference for the application of similar inclusions.

Key words: Xifeng oilfield, fluid inclusion, Mesozoic, hydrocarbon migration stage, Ordos basin

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