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.