关键词: 盆地模拟, 地史模型, 断层发育史, 超压史, 回剥与超压相结合

Abstract: In the basin modeling system,the function of geohistry model is to rebuild the depositional and structural histories of a petroliferous basin.There are two kinds of method of forward deduction and backward deduction in this model. "Forward" refers to the restoration of geohistory from past to present,e.g.,the technique of overpressure,which is applicable to normal-compacted formations;"Backward" refers to the restoration of geohistory from present to past,e.g.,the technique of backstripping,which is applicable to under-compacted formations.The advantage of backstripping is highly accurate while its disadvantage is not applicable to under-compacted formations because overpressure is not taken into account.On the contrary,the advantage of overpressure is applicable to under-compacted formations but low accurate.The combination of backstripping and overpressure,which is first proposed by the author,can consider the overpressure and ensure the accuracy.Its main idea is that from presently known basin conditions to deduce backward in time the geohistory of every individual formation with backstripping first,to deduce forward in time the overpressure of the formations,and finally to modify the backstripping results. For more accurate reconstruction,geohistory model should consider as many significant geological phenomena as possible,such as depositional hiatus,sedimentary compaction, undercompaction (overpressure),single-formation erosion,multi-formation continuous erosion,fault and paleo-bathymetry etc.Among them,the simulation of fault development history is the most difficult.The author is the first one to present the backstripping considering the fault development history.

Key words: basin modeling, geohistory model, fault development history, overpressure history, combination of backstripping and overpressure