Oil & Gas Geology ›› 2002, Vol. 23 ›› Issue (4): 343-347.doi: 10.11743/ogg20020408

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Ro INVERSION OF THERMAL HISTORY RECONSTRUCTION IN SEDIMENTARY BASIN AND ITS RELATED PROBLEMS

Chen Gang1,2, Zhao Zhongyuan1, Li Pilong2, Ren Zhanli1, Yan Hanjie2, Liu Aiyong1   

  1. 1. Department of Geology, Northwest University, Xi'an, Shannxi;
    2. Geophysical Exploration Research Institute of Shengli Oil Field Company Ltd SINOPEC, Dongying, Shandong
  • Received:2002-04-30 Online:2002-12-25 Published:2012-01-16

Abstract:

Vitrinite reflectance, also abbreviated to Ro, in various depth of same sedimentary basin is a reflector of thermal current density changes experienced by the basin. Therefore, the evolutional history of a basin can be reflected by reconstructing ancient thermal current, paleo-ground temperature and a Ro model in the basin. However, Ro can be explained in several ways for multi-cycle basins and with inconvertibility, the reconstruction of a prototype basin would be started at the first and try your best to get as much reliable information about Ro as possible when you conduct basin inversion with Ro. In order to overcome inconvertible and coverable feature of Ro, LgRo-H section can be explained segment by segment to gain average value of Ro as that segment Ro value in terms of the sedimentary stratum separated by unconformity. As for abrupt change LgRo-H curve, attention should be paid to effects of local volcanic activities and abnormal value should be picked out. Moreover Ro. Information about basin outcrops and shallow buried areas is mainly applied to explain features of paleo-ground temperature in the early stage of the basin evolution.

Key words: superimposed basin, thermal history, Ro inversion, reconstruction, comprehensive constraint

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