High Resolution Stratigraphy Study on Fluvial Deposit of Guantao Formation in Kenxi Oil Field

Key words: 
• fluvial deposit /
• high resolution stratigraphy /
• base level variation depositional model /
• Kenxi oil field /

Abstract: It is difficult to divide and interpret the fluvial strata because its depositional environment is very special compared with others. The response principle between base level cycle and genetic strata developed by Cross is regarded as the basic theory for high-resolution stratigraphy applications in fluvial strata. The key of high resolution isochronostratigraphic correlation is to identify multi-level base cycles. Short-term base level cycles can be identified by sedimentary microfacies, analysis on the well profiles and the well profile themselves.The mid-term base level cycles also can be identified by stacking patterns of short-term cycles on the base of log curves facies model. Taken the turnround point of base-level cycle as optimal positions in the connected wells' profile isochro nostratigraphic correlation,the high resolution sequence stratigraghic framwork can be established. The paperhas analyzed the evolution principle of fluvial strata and the coupling between base level and sedimentary lateral migration,vetical stacking from the view of base level variation on the established frame work,and pointed out that the environment model is finally different from the classical one.