Sequence stratigraphy and sedimentary evolution of Bachu formation in Tarim basin
Abstract：In order to reveal the sequence stratigraphic pattern and sedimentary evolution oI tsa- chu formation in Tarim basin based on the principle of sedimentary and sequence stratigraphy and analyses of mud logging, well logging and seismic data, the sequence stratigraphy frame of Bachu was established and the sedimentary evolution was studied. The results show that Bachu formation can be divided into two sequences ： SQbl and SQb2, both of which can be divided into transgression systems tract （TST） and highstand systems tract （HST）. Stratigraphic distribu- tion range of both sequences extends further layer by layer and individual sequence overlaps the former. The sedimentary environment includes mainly shallow sea, shoreface, foreshore, backshore, coastal dune and carbonate shoal. From early to late stage of Baehu formation depo- sition, terrigenous detritus mixed with authigenic deposition continuously. In the mass, sedi- mentary facies evolution tendency turned from major terrigenous detrital depositional system into major carbonate platform. The palaeogeomorphology of Epicontinental Sea and the back- ground of general transgression controlled the sequence development and sedimentary evolution of Bachu formation.
Keywords：Tarim basinBachu formationsequence stratigraphysedimentary evolutionsed-imentary model
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：15( 242-255,261 )