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High Resolution Sequence Stratigraphy of Daanzhai Formation, Lower Jurassic in Sichuan Basin

Zheng Rongcai(Chengdu University of Technology,State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu\ 610059)  
According to the data of rock cores and well logging interpretations,three order base level cycles were recognized from Daanzhai Formation,Lower Jurassic in Sichuan Basin,which consist of 41-47 short term base level cycles,5 mid term base level cycles and 2 long term base level cycles from bottom to top of the formation.The short term base level cycles could be divided into two cycle types of nonsymmetry and symmetry,of which the former developed fining upward and the latter developed fining upward coarsening.The 5 mid term base level cycles were composed of several short term base level cycles in different stacking pattens and represented respectively the lowstand progradation sequence set,lake transgressive aggradational retrogradational sequence set,lake flood aggradational parasequence set,early highstand aggradational to weak progradational sequence set and later highstand strong pragradational sequence set.The 2 long term base level cycles consisted of 5 mid term base level cycles,and demonstrated separately the changes of the lake level rise and fall in long term during the Daanzhai Epoch,Early Jurassic,and constituted the complete depositional sequence of lacustrine transgressive regressive cycles.According to the high resolution isochronostratigrapnic correlation of the turnround points of the multi order based level cycles,the Daanzhai Formation high resolution sequence stratigraphic framework can be built and it showed the relationship among the evolution of the multi order base level cycles and the distribution of the reservoirs,source rocks and caprocks of the formation.
【CateGory Index】: P534.52
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