The High Resolution Sequence Stratigraphy Analysis And Fravourable Reservoir Sandbody Prediction Of Chang 8 Oil-bearing Bed Of The Upper Triassic Yanchang Formation In South Ordors Basin

Based on mastering field geological data and digesting the research result of predecessors, guided by the theory of high resolution sequence stratigraphy , by means of comprehensive analysis of field geological of outcrops, observation and description of cores, analysis of drilling and logging data, the outhor analyze the characteristics of the high resolution sequence stratigraphy of Chang 8 oil-bearing bed of the Upper Triassic Yanchang Formation in southern Ordors Basin,devide the short-term base-level recycle, discuss the distributing of sedimentary system in each base-level recycle, the distributing and development regulations of the fravourable sandbody.According to the stratigraphy development characteristics and regional structure of Chang 8 oil-bearing bed of the research region,at the same time,considering the sequence development's factor including structure,climate,resource,A/S,combining Cross's principle, the outhor devide the Chang 8 oil-bearing bed into two meditum-term base-level and six short-term base-level.Based on analysyzing the influence of the characteristics of the high resolution sequence stratigraphy on the distributing regulary of fravourable reservoir in stratigraphic grillwork, this paper predicts the fravourable reservoirs in Chang 8 oil-bearing bed in the research region The outhor consider that the aeras of Mubo,Maling,Yuele and the north of Zhenyuan are respectively fravourable exploration aims, and its aeria is morthen 1500 Km~2.