Research On The Chararistic Of Seismic Stratigraphy And Sedimentary Facies Of The Lower Cambrian Strata In Tarim Basin

During This paper is base on crop data、seismic data、well log data,apply for the theory and method of multidisciplinary ,such as seismic sedimentology、sequence stratigraphy and sedimentology . using the subject of seismology and geology, the method combine withThe overall and partial research, dividing and correlating the lower Cambrian strata in tarim basin.explain the seismic stratigraphy chararistic of lower Cambrian strata. base on this ,studying the distribution of seismic facies and sedimentary facies, research into the sedimentary mood of marine carbonate lower Cambrian strata in tarim basin,the research results play a direct role in region oil-gas exploration.（1） building the seismic stratigraphy interpretation scheme of lower Cambrian strata, described the chararistic of seismic stratigraphy,in the lower Cambrian strata, determined T₉⁰ （Cambrian strata bottom boundary）,T₈³ （lower Cambrian xiaorbulak fm top boundary ）,T₈² （lower Cambrian usugar fm top boundary ） three standard seismic reflection layer ,dividing two seismic sequence,sbl （T₉⁰-T₈³）: the corresponding stratigraphic units is yurtusi fm and xiaorbulak fm which blong to lower Cambrian, sb2 （ T₈³-T₈²）: :the corresponding stratigraphic units isusugar fm which blong to lower Cambrian.（2） Using the seismic attribute parameters as the dividing standard, six types of seismic faces has been divided,different stage formation have different main seismic faces types,additionally, the horizontal distribution of seismic faces have delivery degeneration in attribution.（3） reference for the previous sedimentary faces gragh of Cambrian in tarim basin,combine the recognition seismic data and comprehension of sedimentary environment,using the crop data and sedimentary faces of single well confine the seismic interpretantion,the sedimentary environment interpretation of seismic faces in lower Cambrian embody that every seismic faces can represent one or more types sedimentary environment and sedimentary faces,and tend to some main types ,that is seismic faces have the dominant facies. （4） During the early cambrian epoch, the eastern of tarim as a stable basin faces region, the western of tarim go through the shallow water basin edge , platform margin, open platform and restricted platform, and become stable platform sedimentary region step by step,Keping-Tabei region located between platform margin to open platform,but Bachu-Tazhong region belong to restricted platform to platform evaporite facies, lower Cambrian of tarim basin basically corresponds Wilson sedimentary faces mode,but never found reef flat facies.