Current status and progress in nonmarine sequence architecture and sedimentary modelling
Sequence stratigraphy,as a new method for basin analysis,has received great attention from geologists,especially in the study of continental sequence architecture and numerical modelling,which has become an international hot topic.This article summarizes the current research progress of non-marine sequence architecture at home and abroad,introduces the concepts of"downstream-controlled area"and"upstream-controlled area"and their respective sequence architecture characteristics in recent years abroad.The sequence architecture of"downstream-controlled area"depends on relative sea(lake)level changes,and the"lowstand normal regression","transgressive","highstand normal regression"and"falling stage"systems tracts are developed,while the sequence architecture of"upstream-controlled area"does not depend on relative sea(lake)level changes,and the high(channel)amalgamation and the low(channel)amalgamation systems tracts are developed.There are also various views on"sequence architecture"in China,and the most representative one should be the classification of"L-type,T-type,TH-type,H-type(E-H type and L-H type)"sequence architectures.The modelling of nonmarine se-quences has evolved from being dominated by the physical flume experiments to the current era of combi-ning flume experiments with numerical simulation.Based on the introduction of the development history and research status of sequence numerical simulation at home and abroad,this article focuses on five numeri-cal simulation methods,including SEDPAK forward modelling,SEDSIM forward modelling,three-di-mensional forward modelling based on Delft3D model,DIONISOS three-dimensional forward modeling,and sequence numerical modeling based on the N-S equation.The paper has also summarized the sequence architecture of continetal lacustrine basins and the application of numerical modeling in the field of oil and gas exploration and development,and analyzed the current theoretical challenges,difficulties in numeri-cal modeling technology,and future development directions of numerical modelling.
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