Application of the Theory of HighResolution Sequence

Key words: 
• Jimsar Sag

Abstract: By means of highresolution sequence stratigraphy study on Permian Wutonggou Formation reservoir in Jimsar Sag of Junggar Basin,we identified three parasequence types corresponding to three shortperiod base level cycle modes: base level rising parasequence, base level fallng parasequence, base level rising and falling half cycle composite parasequence. And two middleperiod base level cycles are discriminated. The formation of middle baselevel falling cycle is made up of mutliprograding shortperiod cycles whereas middle baselevel rising cycle stacking mode presents retrograding structures. The Permian Wu Tong Gou Formation can be classified 5 parasequence sets(corresponding to 5 middleperiod base level cycles) in this area,which is S1,S2,S3,S4,S5from bottom to top. S1,S2are formed during rising stage of baselevel while S3,S4,S5 formed during falling stage. According to the research conclusions we reckon the two petroliferous sand beds of Well Ji 7 and Well Ji 17 are not pertained to a same sand set as its forming reason is different. So we have resolved the practical question. One stratigraphic trap and five lithologic traps are recognized by the theory of highresolution sequence stratigraphy and the prospecting targets are offered.