Control effect of karst paleogeomorphology on the sedimentation of marine-continental transitional shale strata and its geological significance — Using the Lower Permian Shanxi Formation in the eastern Ordos Basin as an example Available to Purchase

Revealing the constraint of paleogeomorphology on the sedimentary system and sediment distribution has become a hot topic in the analysis of oil and gas basins. The restoration of paleogeomorphology is of great significance to the study of the sedimentary types and distribution of the overlying strata. Based on confirming the existence of karst unconfor-mity at the top of Taiyuan Formation, using the impression method through a de-compaction correction to reconstruct the karst paleogeomorphology at the top of Taiyuan Formation, and constitute a geomorphological pattern of interjacent depressions and highlands. The inherited geomorphology controls the sedimentation of transitional facies shale strata in the Shan 2 lower sub-member, and a typical barrier island-tidal flat-lagoon/bay sedimentary assemblage was formed. And then control the spatial differential distribution of different sediments.