Abstract:

Same as the burial depth, the burial time also has great effect on the evolution of porosity of the classic rocks during compaction, which is clarified by three aspects in this paper. The first, the author draws an inference that porosity of stratum is a function of buried depth and buried time. The second, the relationship between the porosity of mudstone and the buried depth, and the relationship between the porosity and buried time in three representative sedimentary basins gives  an indication of the effects of depth and burial time on the evolution of porosity for the classic rocks. The third, the results from the simulative compaction of sediment in the lab further prove  that the time during compaction influences the degree of the compaction greatly. So the porosity of the classic rocks during compaction is the dual function of depth and burial time in sedimentary basins.

Key words:  depth, burial time, porosity, compaction process