Research On Sequence Stratigraphy Of Beier Depression In Hailaer Basin

Based on the principles of classical sequence stratigraphy and sedimentology, the comprehensive utilization of seismic data, well logging and core etc, combined with analyses of regional tectonic sedimentary background,the sequence framework lower Crataceous in Beier Sag was set up and divided into 1 primary sequences,4 secondary sequences and 7 tertiary sequences; The whole of lower cretaceous as a primary sedimentary cycles from the initial formation, transgretion, to finally rise, filling different evolution process, and it can be regarded as primary sequence,4 secondary sequences are defined by 5 main unconformities, the formation of primary sequences and secondary sequences are closely related with tectonic activities, tertiary sequences aredefined by local unconformity and corresponding conformity and sedimentary cycles. Using seismic logging data for all levels and sequence interface identification and tracking,though individual well sequence division and well tie section, and finally set up sequence stratigraphic framework;And study characteristics of stratigraphic distribution under stratigraphic framework.Within the study of classical sequence stratigraphy, further study on well logging, core conbined with analyses of regional tectonic sedimentary background,begin with well core description,Use feature of the corresponding logging curve summary log facies elements feature, this paper has studied the facies type; There are alluvial fan,fan braided delta,meandering river, and lakes sedimentary system. Reuse individual well sequence division and well tie section, realize sedimentary facies by point to the line again to plane lineated narration. In unit of tertiary sequences, study on sedimentary system under the sequence stratigraphic framework and clarifies the distribution of sedimentary faces characteristics of Beier sag in different periods. And summarize sedimentary evolution rule, we think Bell sag development mountain residual basin fillings early.Sedimentary morphology mainly for alluvial fan-braided fan delta-littoral and shallow lake sedimentary system; Then Sedimentary morphology of passive rift basin by alluvial fan-braided fan delta-littoral and shallow lake sedimentary system transition to braided river delta-lake sedimentary system;Active rift basin fault depression sedimentation filling pattern with braided delta primarily;Active rift basin after crack fault sedimentary filling pattern are braided channel...