关键词: 叠合盆地, 热演化史, R_o反演, 恢复, 综合约束

Abstract:

Vitrinite reflectance, also abbreviated to R_o, 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 R_o model in the basin. However, R_o 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 R_o as possible when you conduct basin inversion with R_o. In order to overcome inconvertible and coverable feature of R_o, LgR_o-H section can be explained segment by segment to gain average value of R_o as that segment R_o value in terms of the sedimentary stratum separated by unconformity. As for abrupt change LgR_o-H curve, attention should be paid to effects of local volcanic activities and abnormal value should be picked out. Moreover R_o. 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, R_o inversion, reconstruction, comprehensive constraint